Łukasz Żywczyk, Ph.D., Eng.

Department of Mechanics of Materials (ZMM)
Materials Modeling Group (ZeMM)
position: assistant professor
telephone: (+48) 22 826 12 81 ext.: 401
room: 236
e-mail: lzywczyk

Doctoral thesis
2016-09-27Modelling of dynamics of fractal-like aerosol aggregates 
supervisor -- Prof. A Moskal, Ph.D., Dr. Habil., Eng., PW
1361 
Recent publications
1.Żywczyk Ł., Moskal A., Gradoń L., Numerical simulation of deep-bed water filtration, SEPARATION and PURIFICATION TECHNOLOGY, ISSN: 1383-5866, DOI: 10.1016/j.seppur.2015.10.003, Vol.156, pp.51-60, 2015
Abstract:

A two-dimensional simulator based on network model has been employed to design structure of filter composed of a few layers. The complex structure of the filter was represented by system of cylindrical channels connected via nodes, which represent basic quantities of the filter structure, like porosity or permeability. Performance of monolayer, multilayer and gradient filters was compared. Results show that depending on the number of layers, their porosities, the sequence of each layer aligned in the structure and channel diameter distribution significantly influence the amount of particles collected by the particular structure. Evolution of pressure drop, collection efficiency of particles and quality factors are the aspects, which should be tackled, to design an optimal filter structure

Keywords:

Deep bed-water filtration, Network model, DLVO, Brownian dynamics algorithm

Affiliations:
Żywczyk Ł.-other affiliation
Moskal A.-Warsaw University of Technology (PL)
Gradoń L.-Warsaw University of Technology (PL)
2.Żywczyk Ł., Moskal A., Modelling of deposition of flexible fractal-like aggregates on cylindrical fibre in continuum regime, JOURNAL of AEROSOL SCIENCE, ISSN: 0021-8502, DOI: 10.1016/j.jaerosci.2014.12.002, Vol.81, pp.75-89, 2015
Abstract:

A new mathematical model of aggregate composed of N primary spherical particles has been created. The aggregate structure is modelled as an elastic body, capable of undergoing stretching, bending and twisting, during its movement in fluid. An aggregate is defined as a system of spherical particles joined together by springs, and the stiffness of structure is maintained by potential energy functions. Aggregate movement has been tracked in a Kuwabara cell model for three different values of velocity in continuum regime. The deposition efficiency of aggregates on a cylindrical collector has been related to the fractal dimension of aggregates, velocity of air and spring constant, which determine the magnitude of deformation of the aggregate structure. It was found that fractal dimension, velocity of air and imposed parameters of oscillations constants, strongly influence the deposition efficiency of aggregates

Keywords:

harmonic oscillator equation, potential energy functions, fractal-like aggregates, fractal dimension

Affiliations:
Żywczyk Ł.-other affiliation
Moskal A.-Warsaw University of Technology (PL)