自由分子区内颗粒的近壁曳力特性研究  

Investigation of Drag Force on the Particle Moving Towards a Planar Wall in the Free Molecule Regime

作　　者：丁宇 单庆茹 张克学 王军[1] 夏国栋[1] DING Yu;SHAN Qingru;ZHANG Kexue;WANG Jun;XIA Guodong(MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学,传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室,北京100124

出　　处：《工程热物理学报》2025年第1期177-182,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51776007)。

摘　　要：本文基于气体动理论方法,分别得到了自由分子区内近壁球形颗粒平行于壁面和垂直于壁面运动时的曳力计算式。计算结果表明,当气体分子在壁面为完全镜反射时,则不会有近壁效应产生。当壁面存在漫反射,颗粒运动速度平行于平壁时,颗粒沿平行于平壁方向所受的力为曳力,同时在垂直于平壁方向会受到近壁作用力,其方向在壁面温度较高时为远离平壁方向,在壁面温度较低时为靠近平壁方向;当颗粒垂直于平壁运动时,颗粒沿垂直于平壁方向受力为曳力和近壁作用力的合力。In this paper,based on the method of gas kinetic theory,the formulas for the drag force of the spherical particle moving in the near-wall region are obtained in the free molecular regime respectively.The results show that there is no near-wall effect when the gas-wall reflection is specular.When the particle moves parallel to the planar wall with diffuse scatterings,the force on the particle in the direction parallel to the planar wall is the drag force and in the direction perpendicular to the planar wall is the near-wall force.At higher wall temperatures,the particle is repelled by the wall effect,while at lower wall temperatures,the particle can move towards close to the wall.When the particle moves perpendicular to the wall,the force on the near-wall particle is the resultant force of the drag force and the near-wall force.

关 键 词：微细颗粒 自由分子区 气体动理论 近壁效应 

分 类 号：O359[理学—流体力学]