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International Journal of Thermal Sciences 45 (2006) 10451051 www.elsevier.com/locate/ijts

Summary: International Journal of Thermal Sciences 45 (2006) 1045­1051
Kinetic modeling of temperature driven flows in short microchannels
Alina A. Alexeenko a,
, Sergey F. Gimelshein a
, E. Phillip Muntz a
, Andrew D. Ketsdever b
a Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089, USA
b Propulsion Directorate, Air Force Research Laboratory, Edwards Air Force Base, CA 93524, USA
Received 10 September 2005; accepted 23 January 2006
Available online 9 March 2006
The temperature driven gas flows in both a two-dimensional finite length microchannel and a cylindrical tube have been studied numerically,
with a goal of investigating performance optimization for a nanomembrane-based Knudsen Compressor. The numerical solutions were obtained
using the direct simulation Monte Carlo (DSMC) method and a discrete ordinate method for the ellipsoidal statistical and Bhatnagar­Gross­
Krook models. The Knudsen number was 0.2 and the length-to-height ratio 5. Three different wall temperature distributions were considered:
linear, step-wise, and a non-monotonic profile typical for a radiantly heated Knudsen Compressor's membrane. The short channel end effects are
characterized, and the sensitivity of the mass flow to a non-monotonic temperature distribution is shown.
© 2006 Elsevier SAS. All rights reserved.
PACS: 47.15.Gf; 47.45.Gx; 47.60.+i; 51.10.+y; 82.20.Wt; 83.50.Ha


Source: Alexeenko, Alina - School of Aeronautics and Astronautics, Purdue University


Collections: Engineering