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Singular behaviour of a rarefied gas on a planar boundary

Published online by Cambridge University Press:  01 February 2013

Shigeru Takata  and
Hitoshi Funagane
Shigeru Takata*
Affiliation:
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan Advanced Research Institute of Fluid Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
Hitoshi Funagane
Affiliation:
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
*
†Email address for correspondence: takata.shigeru.4a@kyoto-u.ac.jp
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Abstract

Singular behaviour of a rarefied gas on a planar boundary is clarified on the basis of the Boltzmann equation. The thermal transpiration between two parallel plates is taken as a specific example. First, the flow velocity is shown to behave like $x\ln x$ in the vicinity of the boundary, where $x$ is a distance from the boundary. This implies a logarithmic divergence of the flow velocity gradient as $x\rightarrow 0$. Then, such a spatial singularity is shown to induce a similar singularity of the velocity distribution function (VDF) with respect to ${\zeta }_{n} $ on the boundary, where ${\zeta }_{n} $ is a normal component of the molecular velocity to the boundary. Moreover, the spatial singularity is shown to be quantitatively related to the discontinuity of the VDF on the boundary at ${\zeta }_{n} = 0$. These macroscopic and microscopic singularities should be observed generally in a rarefied gas on a planar boundary.

JFM classification

Rarefied Gas Flow: Kinetic theory Micro-/Nano-fluid dynamics: Non-continuum effects Rarefied Gas Flow: Rarefied Gas Flow
Type
Papers
Information
Journal of Fluid Mechanics , Volume 717 , 25 February 2013 , pp. 30 - 47
Copyright
©2013 Cambridge University Press

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