Momentum and mass fluxes in a gas confined between periodically structured surfaces at different temperatures

被引:33
作者
Donkov, Alexander A. [1 ]
Tiwari, Sudarshan [2 ]
Liang, Tengfei [3 ]
Hardt, Steffen [1 ]
Klar, Axel [2 ]
Ye, Wenjing [3 ]
机构
[1] Tech Univ Darmstadt, Ctr Smart Interfaces, D-64287 Darmstadt, Germany
[2] Tech Univ Kaiserslautern, Fachbereich Math, D-67663 Kaiserslautern, Germany
[3] Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
来源
PHYSICAL REVIEW E | 2011年 / 84卷 / 01期
关键词
KNUDSEN FORCES; RAREFIED-GAS;
D O I
10.1103/PhysRevE.84.016304
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
It is well known that in a gas-filled duct or channel along which a temperature gradient is applied, a thermal creep flow is created. Here we show that a mass and momentum flux can also be induced in a gas confined between two parallel structured surfaces at different temperatures, i.e., orthogonal to the temperature gradient. We use both analytical and numerical methods to compute the resulting fluxes. The momentum flux assumes its maximum value in the free-molecular flow regime, the (normalized) mass flux in the transition flow regime. The discovered phenomena could find applications in methods for energy-conversion and thermal pumping of gases.
引用
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页数:5
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