Krzysztof Wieja, M.Sc., Eng.

Department of Theory of Continuous Media and Nanostructures (ZTOCiN)
Division of Acoustoelectronics (ZeBAk)
position: programmer
telephone: (+48) 22 826 12 81 ext.: 165/223
room: 530
e-mail: kwieja

Recent publications
1.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A., Ptasznik S., Evaluation of High-Pressure Thermophysical Parameters of the Diacylglycerol (DAG) Oil Using Ultrasonic Waves, Food and Bioprocess Technology, ISSN: 1935-5130, DOI: 10.1007/s11947-016-1827-6, Vol.10, No.2, pp.358-369, 2017
Abstract:

Modeling of high-pressure technological processes in the food industry requires knowledge of thermophysical parameters of processed foodstuffs in a broad range of pressures and temperatures. However, the high-pressure thermophysical parameters of foodstuffs are very rarely published in the literature. Therefore, further research is necessary to achieve a deeper insight into the biophysical and thermophysical phenomena under pressure to provide better control of technological processes and optimize the effects of pressure. The essential goal of this work is to evaluate the impact of high pressure and temperature on the thermophysical parameters of liquid foodstuffs on the example of diacylglycerol (DAG) oil (which attracted recently a considerable attention from research and industrial communities due to its remarkable benefits for health), using ultrasonic wave velocity and density measurements. Isotherms of adiabatic and isothermal compressibility, isobaric thermal expansion coefficient, internal pressure, and thermal pressure coefficient versus pressure were evaluated, based on the measurement of the compressional ultrasonic wave velocity and density of DAG oil at high pressures (up to 500 MPa) and at various temperatures. The adiabatic compressibility is affected mostly by the changes of pressure, i.e., it grows about four times when the pressure increases from the atmospheric pressure (0.1 MPa) to 400 MPa at a temperature of 50 °C. By contrast, the internal pressure is a pronounced function of the temperature, i.e., it increases six times when the temperature rises from 20 to 50 °C at a pressure of a 200 MPa. To perform numerical calculations, it was convenient to introduce a Tammann–Tait type equation of state to approximate the measured density isotherms of the investigated DAG oil. The results obtained in this paper can be applied in modeling and optimization of high-pressure technological processes and processing of foodstuffs. Evaluation of high-pressure isotherms of the considered thermophysical parameters of the DAG oil is an original authors’ contribution to the state-of-the-art.

Keywords:

High-pressure food processing, Diacylglycerols, Thermophysical parameters, Isothermal compressibility, Isobaric thermal expansion coefficient, Ultrasonic methods

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.-Warsaw University of Technology (PL)
Ptasznik S.-Air Force Institute of Technology (PL)
2.Kiełczyński P., Ptasznik S., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Thermophysical properties of rapeseed oil methyl esters (RME) at high pressures and various temperatures evaluated by ultrasonic methods, Biomass and Bioenergy, ISSN: 0961-9534, DOI: 10.1016/j.biombioe.2017.09.015, Vol.107, pp.113-121, 2017
Abstract:

Investigation of the high-pressure thermophysical properties of biofuels, e.g., bulk modulus, Surface tension, and viscosity is of paramount importance in fuel injection systems in diesel engines. Another crucial and dangerous phenomenon that may occur in biofuels at high pressures is phase transition (solidification), which can drastically increase the viscosity of the biofuel. This effect may hamper proper operation of the engine, especially under cold-start conditions. Unfortunately, the availability of highpressure thermophysical properties of biofuels is still limited. The goal of this paper is to investigate the impact of high pressures on thermophysical properties of biofuels on the example of rapeseed fatty acid methyl esters (RME) in a wide range of pressures (0:1 to 250 MPa) and temperatures (5 to 20 _C). To this end we employed innovative ultrasonic techniques, i.e., the Bleustein-Gulyaev surface acoustic waves for measuring RME viscosity, and ultrasonic bulk compressional waves for measuring sound velocity in RME and consequently evaluating RME thermophysical parameters, e.g., bulk modulus and surface tension. The viscosity of the measured RME displayed an abrupt increase at pressures: 260 MPa (t Ľ 20 _C), 230 MPa (t Ľ 15 _C), 190 MPa (t Ľ 10 _C), and 130 MPa (t Ľ 5 _C). Evidently it was a signature of the phase transition (solidification) occurring in the RME. The discovered high viscosity high-pressure phase in RME can be very detrimental for operation of modern common rail Diesel engines. Therefore, the results of research presented in this paper should be interesting for engineers and designers working with modern common rail Diesel engines using biofuels.

Keywords:

Biofuels; Methyl esters; Phase transitions; Viscosity; Speed of sound; Ultrasonic methods; High pressure

Affiliations:
Kiełczyński P.-IPPT PAN
Ptasznik S.-Air Force Institute of Technology (PL)
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
3.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Propagation of ultrasonic Love waves in nonhomogeneous elastic functionally graded materials, Ultrasonics, ISSN: 0041-624X, DOI: 10.1016/j.ultras.2015.10.001, Vol.65, pp.220-227, 2016
Abstract:

This paper presents a theoretical study of the propagation behavior of ultrasonic Love waves in nonhomogeneous functionally graded elastic materials, which is a vital problem in the mechanics of solids. The elastic properties (shear modulus) of a semi-infinite elastic half-space vary monotonically with the depth (distance from the surface of the material). The Direct Sturm–Liouville Problem that describes the propagation of Love waves in nonhomogeneous elastic functionally graded materials is formulated and solved by using two methods: i.e., (1) Finite Difference Method, and (2) Haskell-Thompson Transfer Matrix Method.

The dispersion curves of phase and group velocity of surface Love waves in inhomogeneous elastic graded materials are evaluated. The integral formula for the group velocity of Love waves in nonhomogeneous elastic graded materials has been established. The effect of elastic non-homogeneities on the dispersion curves of Love waves is discussed. Two Love wave waveguide structures are analyzed: (1) a nonhomogeneous elastic surface layer deposited on a homogeneous elastic substrate, and (2) a semi-infinite nonhomogeneous elastic half-space. Obtained in this work, the phase and group velocity dispersion curves of Love waves propagating in the considered nonhomogeneous elastic waveguides have not previously been reported in the scientific literature. The results of this paper may give a deeper insight into the nature of Love waves propagation in elastic nonhomogeneous functionally graded materials, and can provide theoretical guidance for the design and optimization of Love wave based devices.

Keywords:

Ultrasonic Love waves, Functionally graded materials, Profiles of elastic constants, Direct Sturm–Liouville Problem, Group velocity

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
4.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Inverse Method for Determining Profiles of Elastic Parameters in the Functionally Graded Materials using Love Waves, ACTA ACUSTICA UNITED WITH ACUSTICA, ISSN: 1610-1928, DOI: 10.3813/AAA.918961, Vol.102, pp.428-435, 2016
Abstract:

This paper presents the use of SH (Shear Horizontal) surface Love waves to determine the distributions of elastic parameters in nonhomogeneous Functionally Graded Materials. The advantage of Love waves applied to investigate the elastic properties of materials is that the Love wave energy (in contrast to the other types of waves, e.g., plate Lamb waves) is concentrated in the vicinity of the surface layer. The penetration depth of the SH surface Love waves depends on the frequency. Therefore, Love waves are particularly suitable for investigating the profiles of the mechanical properties in nonhomogeneous Graded Materials. Direct Problem (Direct Sturm-Liouville Problem) that describes the propagation of Love waves in nonhomogeneous graded materials has been formulated and solved numerically by applying the Transfer Matrix Method. The Inverse Procedure (Inverse Sturm-Liouville Problem) for determining the distribution of elastic properties versus depth in the nonhomogeneous materials has been developed. Love wave dispersion curves in nonhomogeneous graded materials were evaluated numerically (synthetic data). Using the evaluated dispersion curves of Love waves and a developed Inverse Procedure the distributions of elastic shear coefficient as a function of depth (distance from the surface of the material into the bulk) in a heterogeneous surface layer deposited on a homogeneous substrate have been evaluated. Power type profiles (i.e., root square, linear and quadratic) of the shear elastic coefficient in the surface layer were considered. The results of this study can be useful in the investigation of elastic properties of Graded Materials in electronics as well as in geophysics and seismology.

Keywords:

Love waves, Inverse Methods, Functionally Graded Materials, Elastic parameters, Sturm-Liouville Problem

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
5.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Siegoczyński R.M., Ultrasonic Evaluation of Thermodynamic Parameters of Liquids Under High Pressure, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, ISSN: 0885-3010, DOI: 10.1109/TUFFC.2015.007053, Vol.62, No.6, pp.1122-1131, 2015
Abstract:

In many technological processes (e.g., in the chemical, petrochemical, food, and plastics industries), liquids are subjected to high pressures and temperatures. Therefore, knowledge of their thermodynamic properties is essential for understanding, design, and control of the process technology. Direct evaluation of the thermodynamic parameters of liquids under high pressure, using conventional methods, is very difficult. Therefore, the application of these methods in industrial conditions, particularly in on-line control of the technological parameters of liquids, is practically impossible. Ultrasonic methods (e.g., sound speed measurements) are very suitable for this purpose because of their simplicity and accuracy. The sound velocity is closely related to numerous thermodynamic properties of liquids. The objective of this paper is to address the influence of temperature and pressure on the thermodynamic parameters of liquids, using the example of diacylglycerol (DAG) oil, employing ultrasonic methods. In this paper, we present ultrasonic velocity and density measurements (performed by the authors) in DAG oil over a range of pressures and temperatures. On the basis of experimental results (the sound velocity and liquid density versus pressure and temperature) a series of DAG oil thermodynamic parameters such as specific heat ratio, intermolecular free path length, Van der Waals constant b, surface tension, and effective Debye temperature were evaluated as functions of pressure and temperature.

Keywords:

Thermodynamical properties of liquid, High pressure food processing, ultrasonic methods, sound velocity, surface tension

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
Siegoczyński R.M.-other affiliation
6.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Group and Phase Velocity of Love Waves Propagating in Elastic Functionally Graded Materials, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, DOI: 10.1515/aoa-2015-0030, Vol.40, No.2, pp.273-281, 2015
Abstract:

This paper presents a theoretical study of the propagation behaviour of surface Love waves in nonhomogeneous functionally graded elastic materials, which is a vital problem in acoustics. The elastic properties (shear modulus) of a semi-infinite elastic half-space vary monotonically with the depth (distance from the surface of the material). Two Love wave waveguide structures are analyzed: 1) a nonhomogeneous elastic surface layer deposited on a homogeneous elastic substrate, and 2) a semi-infinite nonhomogeneous elastic half-space. The Direct Sturm-Liouville Problem that describes the propagation of Love waves in nonhomogeneous elastic functionally graded materials is formulated and solved 1) analytically in the case of the step profile, exponential profile and 1cosh2 type profile, and 2) numerically in the case of the power type profiles (i.e. linear and quadratic), by using two numerical methods: i.e. a) Finite Difference Method, and b) Haskell-Thompson Transfer Matrix Method.

The dispersion curves of phase and group velocity of surface Love waves in inhomogeneous elastic graded materials are evaluated. The integral formula for the group velocity of Love waves in nonhomogeneous elastic graded materials has been established. The results obtained in this paper can give a deeper insight into the nature of Love waves propagation in elastic nonhomogeneous functionally graded materials.

Keywords:

surface Love waves, group velocity, phase velocity, functionally graded materials, profiles of elastic constants, direct Sturm-Liouville problem

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
7.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Siegoczyński R.M., Ptasznik S., Application of ultrasonic wave celerity measurement for evaluation of physicochemical properties of olive oil at high pressure and various temperatures, LWT-FOOD SCIENCE AND TECHNOLOGY, ISSN: 0023-6438, DOI: 10.1016/j.lwt.2014.01.027, Vol.57, pp.253-259, 2014
Abstract:

High-pressure processing is a powerful technology for food preservation. The knowledge of foods properties in the high-pressure range is important to develop and optimize such processes by means of mathematical modeling and simulation. Ultrasonic methods are rapid, non-invasive and can be used to characterize foods like edible oils (e.g., composition, purity, and quality assessment). In this paper, they were applied for the investigation of physicochemical properties of olive oil at high pressure at different temperatures. The sound wave velocity was measured by the pulse-transmission method and the corresponding oil density was additionally determined from the monitoring of sample volume change. Measurements were conducted in the pressure range up to 600 MPa, for temperatures from 20 to 50°C. Intermolecular free length, isothermal and adiabatic compressibility versus pressure were calculated using measured sound speed and density isotherms. Discontinuities in the measured isotherms of sound speed and density versus pressure indicate the presence of liquid-to-solid phase transitions. The kinetics of the liquid-to-solid phase transition was also investigated. The transformation times of olive oil augment with increasing temperature. This study can be broadened to other liquid foodstuffs to investigate the influence of temperature on their physicochemical properties at high pressure.

Keywords:

Physicochemical properties, Intermolecular free length, Ultrasonic velocity, High-pressure food processing, Olive oils

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
Siegoczyński R.M.-other affiliation
Ptasznik S.-Air Force Institute of Technology (PL)
8.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Malanowski A., Kościesza R., Tarakowski R., Rostocki A.J., Siegoczyński R.M., Determination of physicochemical properties of diacylglycerol oil at high pressure by means of ultrasonic methods, Ultrasonics, ISSN: 0041-624X, DOI: 10.1016/j.ultras.2014.06.013, Vol.54, No.8, pp.2134-2140, 2014
Abstract:

The purpose of the paper is to address, using ultrasonic methods, the impact of temperature and pressure on the physicochemical properties of liquids on the example of diacylglycerol (DAG) oil. The paper presents measurements of sound velocity, density and volume of DAG oil sample in the pressure range from atmospheric pressure up to 0.6 GPa and at temperatures ranging from 20 to 50°C.

Sound speed measurements were performed in an ultrasonic setup with a DAG oil sample located in the high-pressure chamber. An ultrasonic method that uses cross-correlation method to determine the time-of-flight of the ultrasonic pulses through the liquid was employed to measure the sound velocity in DAG oil. This method is fast and reliable tool for measuring sound velocity. The DAG oil density at high pressure was determined from the monitoring of sample volume change. The adiabatic compressibility and isothermal compressibility have been calculated on the basis of experimental data. Discontinuities in isotherms of the sound speed versus pressure point to the existence of phase transitions in DAG oil. The ultrasonic method presented in this study can be applied to investigate the physicochemical parameters of other liquids not only edible oils.

Keywords:

Ultrasonic methods, Sound velocity, Phase transitions, High pressure food processing, Physicochemical parameters

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Malanowski A.-other affiliation
Kościesza R.-other affiliation
Tarakowski R.-other affiliation
Rostocki A.J.-Warsaw University of Technology (PL)
Siegoczyński R.M.-other affiliation
9.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Siegoczyński R.M., Thermodynamic Method for Measuring the B/A Nonlinear Parameter Under High Pressure, ENGINEERING TRANSACTIONS (ROZPRAWY INŻYNIERSKIE), ISSN: 0867-888X, Vol.62, No.1, pp.5-15, 2014
Abstract:

The nonlinearity parameter B/A is a measure of the nonlinearity of the equation of state for a fluid. The nonlinearity parameter B/A is a physical parameter often used in acoustics, from underwater acoustics to biology and medicine. It can provide information about structural properties of the medium, internal pressure and inter-molecular spacing. The thermodynamic method has been applied for determination of B/A parameter in diacylglycerol (DAG) oil as a function of pressure at various temperatures. Isotherms of the density and phase velocity of longitudinal ultrasonic wave as a function of pressure have been measured. Using the thermo- dynamic method along with measured isotherms of sound speed and density, the nonlinearity parameter B/A (for DAG oil) was evaluated as a function of pressure (up to 220 MPa) at various temperatures ranging from 20 to 50◦C.

Keywords:

Nonlinearity parameter B/A, thermodynamic method, high pressure, longitudinal ultrasonic wave velocity

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
Siegoczyński R.M.-other affiliation

Conference papers
1.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Ptasznik S., Rostocki A.J., Investigation of regular and anomalous behavior of liquid media under high pressure using ultrasonic methods, 2017 IEEE, 2017 IEEE International Ultrasonics Symposium, 2017-09-06/09-09, Washington, DC (US), pp.1-4, 2017
Abstract:

In many industrial technological processes, liquids are subjected to high pressures, e.g., in the high pressure food preservation. Similarly, in modern fuel injection systems for diesel engines, biofuel is subjected to a pressure up to 300 MPa. In such conditions, in liquids, high-pressure phase transitions (solidification) can occur that substantially increase the density and liquid viscosity. This solidification can result in significant problems with engine failure under cold-start conditions. This is an evident recipe for disaster, since the engine and its accessories would be very likely quickly destroyed. Thus, it is important to determine at what pressures and temperatures phase transitions occur. Conventional mechanical methods for measuring physicochemical properties of liquids at these extreme conditions do not operate. By contrast, ultrasonic techniques are very suitable for measurements of hysicochemical properties of liquids at high pressure, since they are non-destructive, can be fully automated and are characterized by the absence of moving parts. The aim of this work is to study the high-pressure hysicochemical properties of liquids (exemplified by a Camelina sativa - false flax oil) using novel ultrasonic methods.

Keywords:

pressure; ultrasonic methods; phase transitions; Camelina sativa

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Ptasznik S.-Air Force Institute of Technology (PL)
Rostocki A.J.-Warsaw University of Technology (PL)
2.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., The influence of rheological parameters of viscoelastic liquids on the propagation characteristics of ultrasonic Love waves, 2017 IEEE, 2017 IEEE International Ultrasonics Symposium, 2017-09-06/09-09, Washington, DC (US), pp.1-4, 2017
Abstract:

Progress in materials science has led to development of new materials with improved functional characteristics. One of the new types of materials introduced into industrial practice are plastics and polymers. These materials exhibit rheological (viscoelastic) properties, which combine simultaneously the properties of liquids and solids. Due to their attractive features, such as low specific weight, high resistance to chemical agents, ease of processing, cost ffectiveness etc. these materials are widely used in chemical, automotive, aviation and space industry. In addition, these materials are very common in many aspects of everyday life. Thus, it is very important, both from the theoretical and practical point of view, to develop new, robust and accurate methods to measure the rheological parameters (viscosity η, elasticity μ and density ρ) of plastics and polymers. The conventional mechanical methods used so far to this end are outdated, time consuming, and cumbersome. Ultrasonic methods do not possess these disadvantages. The first step in the formulation of the Inverse Method for evaluating the rheological parameters of viscoelastic liquids is to formulate and solve the Direct Sturm-Liouville Problem for Love waves propagating in the investigated layered elastic aveguide loaded on its surface with various types of viscoelastic materials (e.g., liquids). The aim of this study is to develop a rigorous mathematical model (Direct Sturm-Liouville Problem) of propagation of shear horizontal (SH) surface Love waves in layered viscoelastic structures, i.e., in layered elastic waveguides with a guiding surface layer covered with a viscoelastic material described by Kelvin-Voigt, Newton and Maxwell viscoelastic models respectively

Keywords:

Love waves; viscoelastic liquid; Sturm-Liouville problem; dispersion curves

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
3.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Evaluation of viscoelastic parameters of surface layers by ultrasonic Love waves, IUS 2016, IEEE International Ultrasonics Symposium, 2016-09-18/09-21, Tours (FR), DOI: 10.1109/ULTSYM.2016.7728446, pp.1-4, 2016
Abstract:

Simultaneous determination of the rheological parameters of viscoelastic surface layers is very important in many applications such as: sensors, geophysics, seismology, and in the NDT of materials. Love wave energy is concentrated near the waveguide surface, so that Love waves are especially suited to study the material properties of surface layers. In this work, the Direct Sturm-Liouville Problem for the Love wave propagation in a layered viscoelastic waveguide have been presented and solved. Next, the Inverse Problem was created and solved as an Optimization Problem. The adequately formulated objective function that depends on the elastic and viscoelastic parameters of a waveguide of the Love wave and the experimental data was used. The solution of the Inverse Problem allows to determine unknown values of the viscosity and shear elasticity of a viscoelastic medium from measurements of the dispersion curves of Love waves.

Keywords:

Love waves, rheological properties, viscoelastic materials, inverse problems, viscosity, shear elasticity

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
4.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Ptasznik S., Investigation of high-pressure phase transitions in biofuels by means of ultrasonic methods, IUS 2016, IEEE International Ultrasonics Symposium, 2016-09-18/09-21, Tours (FR), DOI: 10.1109/ULTSYM.2016.7728444, pp.1-4, 2016
Abstract:

The fundamental goal of this work is to verify the hypothesis of the existence of high-pressure phase transitions in biofuel components on the example of rapeseed fatty acid methyl esters (RME), by using ultrasonic methods. in a wide range of pressures (from atmospheric pressure to 300 MPa) and for various temperatures from 5 to 20 °C. Investigation of phase transitions in biofuels at high pressures is of great importance in the design of injection systems in modern diesel engines (common rail). Direct examination of phase transitions in liquids under high pressure, using classical methods, is very difficult. To overcome this disadvantage, the authors applied ultrasonic methods (viscosity measurement), which in contrast to the classical methods allow in a relatively simple way the investigation of high-pressure properties of liquids. Viscosity was measured by the original method that uses ultrasonic surface waves of the Bleustein-Gulyaev type, developed by the authors at the Institute of Fundamental Technological Research in Warsaw. From the measured viscosity isotherms, the occurrence of high-pressure phase transitions in methyl esters were evaluated.

Keywords:

high-pressure phase transitions, biofuels, ultrasonic Bleustein-Gulyaev waves, viscosity measurements

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
Ptasznik S.-Air Force Institute of Technology (PL)
5.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Inverse method for evaluation of elastic parameters in functionally graded materials using ultrasonic Love wave, IUS 2015, IEEE International Ultrasonics Symposium, 2015-10-21/10-24, Taipei (TW), DOI: 10.1109/ULTSYM.2015.0344, pp.1-4, 2015
Abstract:

The aim of this study was to evaluate the inverse procedure to determine profiles (as a function of depth) of the mechanical properties of inhomogeneous FGM resulting from the application of various technological processes of surface treatment. First, the Direct Sturm-Liouville Problem for Love waves propagating in elastic graded materials with various profiles of the shear stiffness as a function of the distance from the surface, has been solved using the Finite Difference Method and Transfer Matrix Method (Haskell-Thompson method). Love wave dispersion curves were evaluated in the frequency range from 4 to 23 MHz. The Inverse Problem was formulated as an Optimization Problem with appropriately constructed objective function that depended on the material properties of an elastic waveguide of the Love wave and the experimental data. To minimize the considered objective function, optimization procedures of the Nelder-Mead type from Scilab software package were employed.

Keywords:

Love waves, Inverse Methods, Functionally Graded Materials, Elastic parameters, Sturm-Liouville Problem

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
6.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Siegoczyński R.M., Ptasznik S., Ultrasonic studies of physicochemical parameters of biofuels in a broad range of pressures and temperatures, IUS 2015, IEEE International Ultrasonics Symposium, 2015-10-21/10-24, Taipei (TW), DOI: 10.1109/ULTSYM.2015.0345, pp.1-4, 2015
Abstract:

The aim of the study was to investigate the phase transitions in biofuel components by using ultrasonic methods on the example of methyl esters of fatty acids, in a wide range of pressures (from atmospheric pressure to 400 MPa) and for various temperatures from 5 to 20 °C. Investigation of phase transitions in biofuels at high pressures is of great importance in the design of injection systems in modern diesel engines (common rail). Direct examination of phase transitions in liquids under high pressure, using classical methods, is very difficult. To overcome this disadvantage, the authors applied ultrasonic methods (viscosity measurement), which in contrast to the classical methods allow in a relatively simple way the investigation high-pressure properties of liquids. Viscosity was measured by the original method that uses ultrasonic surface waves of the Bleustein-Gulyaev type, developed by the authors at the Institute of Fundamental Technological Research in Warsaw. From the measured viscosity isotherms, the occurrence and kinetics of high-pressure phase transitions in methyl esters were evaluated.

Keywords:

High pressure phase transitions, physicochemical parameters of biofuels, ultrasonic viscosity measurements, rapeseed methyl esters

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
Siegoczyński R.M.-other affiliation
Ptasznik S.-Air Force Institute of Technology (PL)
7.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Density and viscosity of liquids determination using an inverse method for Love wave propagation, IUS 15, IEEE International Ultrasonics Symposium, 2014-09-03/09-06, Chicago (US), DOI: 10.1109/ULTSYM.2014.0496, pp.1992-1995, 2014
Abstract:

The aim of this work was to establish an inversion procedure for the simultaneous determination of the viscosity and density of liquids. To this end, measurements of dispersion curves of the phase velocity and attenuation of shear horizontal Love waves were applied. Love waves propagate in an elastic layered waveguide covered on its surface with an investigated viscous (Newtonian) liquid. Firstly, the Direct Sturm-Liouville Problem of the Love wave propagation in a such waveguide was formulated and solved. Subsequently, the Inverse Problem was formulated and solved as an Optimization Problem. The appropriately constructed objective function that depends on the material properties of a waveguide of the Love wave, material properties of an investigated liquid (viscosity and density), and the experimental data was employed. The simultaneous determination of both liquid density and viscosity is important in the monitoring of technological processes in many industries (e.g. chemical, petroleum, pharmaceutical industry) as well as in geophysics.

Keywords:

Love waves, Inverse Methods, Density, Viscosity of liquids , Sturm-Liouville Problem

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
8.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Siegoczyński R.M., Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure, IUS 15, IEEE International Ultrasonics Symposium, 2014-09-03/09-06, Chicago (US), DOI: 10.1109/ULTSYM.2014.0497, pp.1996-1999, 2014
Abstract:

In many technological processes (e.g. in chemical, petrochemical, food and plastics industry) liquids are subjected to high pressures and temperatures. Therefore knowledge of their thermodynamic properties is essential for understanding, design and control of the process technology. Direct evaluation of thermodynamic parameters of liquids under high pressure, using conventional methods, is very difficult. Therefore, these methods are useless in industrial conditions, particularly in on-line control of the technological parameters of liquids. Ultrasonic methods (e.g., sound speed measurements) due to their simplicity and accuracy are very suitable for this purpose. The sound velocity is closely related with numerous thermodynamic properties of liquids. In this paper we report ultrasonic velocity and density measurements (performed by the authors) in diacylglycerol (DAG) oil over a range of pressures and temperatures. On the basis of experimental results (the sound velocity and liquid density versus pressure and temperature) the thermal expansion coefficient, specific heat capacity at constant pressure, isothermal and adiabatic compressibility of DAG oil were calculated as a function of pressure and temperature.

Keywords:

Themodynamic parameters of liquids, high pressure, ultrasonic velocity, density, compressibility

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
Siegoczyński R.M.-other affiliation
9.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Siegoczyński R.M., Thermodynamic method for measuring the B/A nonlinear parameter under high pressure, IUS 2013, IEEE International Ultrasonics Symposium, 2013-07-21/07-25, Praga (CZ), DOI: 10.1109/ULTSYM.2013.0424, Vol.1, pp.1665-1667, 2013
Abstract:

The nonlinearity parameter B/A is a measure of the nonlinearity of the equation of state for a fluid. It plays a significant role in acoustics, from underwater acoustics to biology and medicine. The nonlinearity parameter is important because it determines distortion of a finite amplitude wave propagating in the fluid. Moreover, it can be related to the molecular dynamics of the medium and it can to provide information about structural properties of medium, internal pressures, clustering, intermolecular spacing, etc. Importance of the B/A parameter increases with the development of high-pressure technologies. The thermodynamic method has been applied for determination of B/A parameter in diacylglycerol (DAG) oil as a function of pressure at various temperatures.

Keywords:

Nonlinearity parameter B/A, Thermodynamic method, ultrasoniv velocity, high pressure,

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
Siegoczyński R.M.-other affiliation
10.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Siegoczyński R.M., Ptasznik S., Ultrasonic investigation of physicochemical properties of liquids under high pressure, IUS 2013, IEEE International Ultrasonics Symposium, 2013-07-21/07-25, Praga (CZ), DOI: 10.1109/ULTSYM.2013.0414, Vol.1, pp.1626-1629, 2013
Abstract:

High pressure research of the physicochemical properties of liquids has been stimulated by the fast development of such technologies as biodiesel production, high-pressure food processing and conservation, modification of biotechnological properties. Monitoring and studying liquid viscosity and ultrasonic wave velocity in liquids as a function of pressure and temperature enable to evaluate many important physicochemical parameters of liquids. These methods allow also insight into the phenomena governing the microstructural modifications occurring in treated substances, i.e. phase transitions. The knowledge of physicochemical properties (e.g. density, relaxation time, internal pressure or free volume) of pressurized substances is essential for understanding, design and control of the process technology. Measurements were conducted on the example of diacylglycerol oil (DAG oil), that is an important constituent of oils and fats.

Keywords:

Physicochemical parameters of liquids, high pressure, ultrasonic velocity, viscosity of liquids, DAG oil

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)
Siegoczyński R.M.-other affiliation
Ptasznik S.-Air Force Institute of Technology (PL)

Conference abstracts
1.Kiełczyński P., Szalewski M., Balcerzak A., Wieja K., The influence of rheological parameters of viscoelastic liquids on the propagation characteristics of ultrasonic Love waves, 2017 IEEE, 2017 IEEE International Ultrasonics Symposium, 2017-09-06/09-09, Washington, DC (US), pp.415, 2017
Abstract:

Progress in materials engineering has led to development of new materials with improved functional characteristics. One of the new types of
materials introduced into industrial practice are plastics and polymers. These materials exhibit rheological (viscoelastic) properties, which combine
simultaneously the properties of liquids and solids. Due to their attractive features, such as low specific weight, high resistance to chemical agents,
cost effectiveness etc. these materials are widely used in chemical, automotive, aviation and space industry. Thus, it is very important to develop
new, robust and accurate methods to measure the rheological parameters (viscosity η, elasticity μ and density ρ) of plastics and polymers. The
conventional mechanical methods used so far to this end are outdated, time consuming, and cumbersome. To overcome this problems, the authors
propose the use of ultrasonic methods that employ surface Love waves, what is a novelty.

Keywords:

Love waves, Rheological parameters, Rheological models, Polymers

Affiliations:
Kiełczyński P.-IPPT PAN
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
2.Kielczynski P., Ptasznik S., Szalewski M., Balcerzak A., Wieja K., Rostocki A.J., Investigation of regular and anomalous behavior of liquid media under high pressure using ultrasonic methods, 2017 IEEE, 2017 IEEE International Ultrasonics Symposium, 2017-09-06/09-09, Washington, DC (US), pp.417, 2017
Abstract:

Background, Motivation and Objective
In many industrial technological processes, liquids are subjected to high pressures, e.g., in the high pressure food preservation. Similarly, in modern fuel
injection systems for diesel engines, biofuel is subjected to a pressure up to 300 MPa. In such conditions, in liquids, phase transitions can occur that
substantially increase the density and liquid viscosity. This can be very detrimental for the engine or the technological equipment. Thus, it is important to
determine at what pressures and temperatures phase transitions occur. Conventional mechanical methods for measuring physicochemical properties of
liquids at these extreme conditions do not operate. By contrast, ultrasonic techniques are very suitable for measurements of physicochemical properties of
liquids at high pressure, since they are non-destructive and can be fully automated. The aim of this work is to study the high-pressure physicochemical
properties of liquids (exemplified by a camelina sativa - false flax oil) using novel ultrasonic methods.

Keywords:

High pressure, Biofuels, Viscosity, Phase transitions

Affiliations:
Kielczynski P.-IPPT PAN
Ptasznik S.-Air Force Institute of Technology (PL)
Szalewski M.-IPPT PAN
Balcerzak A.-IPPT PAN
Wieja K.-IPPT PAN
Rostocki A.J.-Warsaw University of Technology (PL)