The cylindrical Couette flow of a rarefied gas from macro- to micro-scales, in the case where the inner cylinder is rotating whereas the outer cylinder is at rest, is extensively investigated by direct simulation Monte Carlo (DSMC) code incorporated with a Volume-CAD software. The generalized soft sphere (GSS) model is applied to an intermolecular collision calculation. The diffuse reflection model and Cercignani-Lampis-Lord (CLL) model are used to model the molecule-surface interaction by considering the accommodation coefficients on inner cylinder (ACI hereafter) and outer cylinder (ACO hereafter) separately. The contents in this paper include following three aspects: I the flow field characteristics and force and torque on inner cylinder for eccentric Couette flow between different scales with same non-dimensional parameters (accommodation coefficients, eccentricity-clearance ratio, Knudsen number and Reynolds number) are compared; the flow field characteristics for different scales are same; with the increase of the scale, the total force on the inner cylinder increases slightly, while the torque is proportional to the scale; II the velocity profiles in concentric Couette flow under different non-dimensional parameters are studied; the result shows that the phenomenon of inverted velocity profile in the concentric Couette flow is only induced by a smooth outer cylinder; the non-dimensional tangential velocity, as well as its gradient is high at low Reynolds number; the Knudsen number has great impact on the tangential velocity profile, and the velocity profile may not be inverted in the case of low Knudsen number; III the flow field characteristics in eccentric Couette flow under different non-dimensional parameters are obtained; the recirculation zone may not appear when Knudsen number is high; the position of its center may be different depending on Reynolds number; with the increase of Reynolds number, the compressibility effect becomes important; stratified distribution of the density becomes obvious at low Knudsen number.
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ASME 2009 Fluids Engineering Division Summer Meeting
August 2–6, 2009
Vail, Colorado, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4373-4
PROCEEDINGS PAPER
Cylindrical Couette Flow of a Rarefied Gas From Macro- to Micro-Scales
Sheng Wang,
Sheng Wang
RIKEN Institute, Wako, Saitama, Japan
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Kangbin Lei,
Kangbin Lei
RIKEN Institute, Wako, Saitama, Japan
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Xilian Luo,
Xilian Luo
RIKEN Institute, Wako, Saitama, Japan
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Kiwamu Kase,
Kiwamu Kase
RIKEN Institute, Wako, Saitama, Japan
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Elia Merzari,
Elia Merzari
Tokyo Institute of Technology, Tokyo, Japan
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Hisashi Ninokata
Hisashi Ninokata
Tokyo Institute of Technology, Tokyo, Japan
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Sheng Wang
RIKEN Institute, Wako, Saitama, Japan
Kangbin Lei
RIKEN Institute, Wako, Saitama, Japan
Xilian Luo
RIKEN Institute, Wako, Saitama, Japan
Kiwamu Kase
RIKEN Institute, Wako, Saitama, Japan
Elia Merzari
Tokyo Institute of Technology, Tokyo, Japan
Hisashi Ninokata
Tokyo Institute of Technology, Tokyo, Japan
Paper No:
FEDSM2009-78359, pp. 469-475; 7 pages
Published Online:
July 26, 2010
Citation
Wang, S, Lei, K, Luo, X, Kase, K, Merzari, E, & Ninokata, H. "Cylindrical Couette Flow of a Rarefied Gas From Macro- to Micro-Scales." Proceedings of the ASME 2009 Fluids Engineering Division Summer Meeting. Volume 2: Fora. Vail, Colorado, USA. August 2–6, 2009. pp. 469-475. ASME. https://doi.org/10.1115/FEDSM2009-78359
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