Reduced mass flow rates of a rarefied Couette and Poiseuille flow in a long rectangular channel are calculated in the whole range of the gas rarefaction and a wide range of the width to height ratio. Furthermore, walls may be made of different materials so that different tangential momentum accommodation coefficients (TMACs) may be applied. Analytical solutions are given for the slip regime, where all four surrounding walls may have a different TMAC. Due to a simplified modeling assumption, these solutions can be used to correct the well-known flow rates of a fully diffuse channel for different TMACs in the whole range of the gas rarefaction. If the slip solution and the diffuse solution are known, the procedure can principally be adapted for any channel shape. The results of the analytical model expressions are validated with simulation data of the plane Couette and Poiseuille flow and the Poiseuille flow through a pipe, which are found in the literature. In addition, the analytical solution is compared to results of the Direct Simulation Monte Carlo (DSMC) method of a Couette and a Poiseuille flow in a rectangular channel, which are provided as tabulated data for a variation of the gas rarefaction parameter at different aspect ratios and different combinations of TMACs. The procedure to calculate the mass flow rate of the certain flow as well as the application limits are discussed.
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August 2022
Research Article|
August 05 2022
Gas–surface interactions of a Couette–Poiseuille flow in a rectangular channel
Heiko Pleskun
;
Heiko Pleskun
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft, Writing – review & editing)
TU Dortmund University, Chair of Fluidics
, Leonhard-Euler-Str. 5, 44227 Dortmund, Germany
a)Author to whom correspondence should be addressed: [email protected]
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Andreas Brümmer
Andreas Brümmer
b)
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Resources, Supervision, Writing – review & editing)
TU Dortmund University, Chair of Fluidics
, Leonhard-Euler-Str. 5, 44227 Dortmund, Germany
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a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 34, 082009 (2022)
Article history
Received:
May 16 2022
Accepted:
July 12 2022
Citation
Heiko Pleskun, Andreas Brümmer; Gas–surface interactions of a Couette–Poiseuille flow in a rectangular channel. Physics of Fluids 1 August 2022; 34 (8): 082009. https://doi.org/10.1063/5.0099256
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