Partner: Prof. P. Doerffer, Ph.D., Dr. Habil., Eng.

Institute of Fluid Flow Machinery, Polish Academy of Sciences (PL)

Recent publications
1.Lewandowski T., Jebauer S., Czerwińska J., Doerffer P., Entrance effects in microchannel gas flow, Journal of Thermal Science, ISSN: 1003-2169, DOI: 10.1007/s11630-009-0345-5, Vol.18, No.4, pp.345-352, 2009

Motivation of this work has its origin in the boundary layer control for aeronautics and turbomachinery. For that purpose boundary layer can be modified by perforated plates with holes of specific sizes. The questions which rise in such configuration are related to the existence of optimal size of the holes and the influence of microscale phenomena on the global flow patterns. This paper concentrates on the issue of the entrance effects on the microchannel flow. It is shown that mass flow rate is only insignificantly influenced by slip effects. Global parameters such as pressure difference and geometrical shape in more pronounced way alter flow behavior. In this paper we concentrate on the numerical investigation of the microchannel flow for Kn < 0.01 and Re < 500. The channel length is finite. Hence, entrance and outlet effects on microchannel flow can be studied.


perforated plates, microchannels, gas flow simulations

Lewandowski T.-other affiliation
Jebauer S.-IPPT PAN
Czerwińska J.-IPPT PAN
Doerffer P.-Institute of Fluid Flow Machinery, Polish Academy of Sciences (PL)

Conference abstracts
1.Flaszyński P., Doerffer P., Mikułowski G., Holnicki-Szulc J., Numerical Simulations for Transonic Flow in Control Valve, 11th International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows, 2013-05-06/06-11, Shenzhen (CN), pp.1-6, 2013

Results of numerical simulations for transonic flow in control valve are presented. The valve is the main part of an adaptive pneumatic shock absorber. Flow structure in the valve domain and the influence of the flow non-uniformity in the valve on a mass flow rate is investigated. Numerical simulation results are compared with experimental data.


pneumatic valve, transonic flow, numerical simulations

Flaszyński P.-Institute of Fluid Flow Machinery, Polish Academy of Sciences (PL)
Doerffer P.-Institute of Fluid Flow Machinery, Polish Academy of Sciences (PL)
Mikułowski G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN

Filing No./Date
Filing Publication
Protection Area, Applicant Name
Patent Number
Date of Grant
BUP 14/17
Doerffer P., Flaszyński P., Mikułowski G., Holnicki-Szulc J.
Zespół płyt zaworowych
PL, Instytut Maszyn Przepływowych im. Roberta Szewalskiego PAN, Doerffer Piotr, Flaszyński Paweł, Mikułowski Grzegorz, Holnicki-Szulc Jan, Instytut Podstawowych Problemów Techniki PAN
WUP 03/18