Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, People's Republic of China.
Phys Rev E. 2018 May;97(5-1):053106. doi: 10.1103/PhysRevE.97.053106.
The present paper is devoted to studying the thermophoresis of a nonspherical convex particle suspended in a gas with nonuniform temperature distribution in the free-molecule regime. Based on the gas kinetic theory and the assumption of a rigid-body collision for the gas-particle interaction, analytical expressions for the thermophoretic forces are obtained for several typical nonspherical bodies, including cylinders, spheroids, needles, disks, and cuboids. The orientation dependences of the thermophoretic forces and thermophoretic velocities are evaluated based on these expressions. It is found that the influence of the pitching effect of the nonspheres can be significant. The expressions for the orientation-averaged thermophoretic forces are also obtained under the assumption of a uniform particle orientation distribution.
本文致力于研究在自由分子区域中，非球形凸粒子悬浮在非均匀温度分布的气体中的热泳现象。基于气体动理论和气体-粒子相互作用的刚体碰撞假设，得到了几种典型非球形物体（包括圆柱体、椭球体、针、圆盘和长方体）的热泳力的解析表达式。基于这些表达式，评估了热泳力和热泳速度的取向依赖性。发现非球形物体的俯仰效应的影响可能是显著的。在假设粒子取向分布均匀的情况下，也得到了取向平均热泳力的表达式。
