Abstract
We model the Knudsen layer in Kramers’ problem by the linearized high-order hyperbolic moment system. Thanks to the hyperbolicity of the moment system, its boundary conditions are properly reduced from the kinetic boundary condition. For the Kramers’ problem, we present the analytical solutions of the linearized moment systems. The velocity profile in the Knudsen layer is captured with improved accuracy for a wide range of accommodation coefficients. With the order of the moment system increasing, the velocity profile approaches to that of the linearized Boltzmann–BGK equation.
| Original language | English |
|---|---|
| Pages (from-to) | 1313-1337 |
| Number of pages | 25 |
| Journal | Continuum Mechanics and Thermodynamics |
| Volume | 31 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1 Sept 2019 |
Keywords
- Boltzmann equation
- Hyperbolic moment equations
- Knudsen layer
- Kramers’ problem
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- General Physics and Astronomy
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