摘要
本文基于流体内部温度梯度的剪切变化特征,提出颗粒在流体中会受到热泳升力的观点。该力与热泳现象中的粒子运动相关但不同于热泳力。介绍了求解得到该热泳升力的两种思路。比拟速度剪切流动中颗粒受到流体作用的升力的过程,给出了颗粒在温度梯度作用下受到的热泳升力的表达式。本文指出该热泳升力与流体平均温度梯度方向垂直,并且指向梯度较大的部分。针对碳纳米管热驱动和暖气片熏墙的例子,分析了热泳升力的作用。
Due to the nonuniform distribution of the temperature gradient in the fluid,the consideration that there exists lift force acting on a particle related with thermophoresis is performed.The force is related to the particle motion in thermophoresis but unlike the thermophoretic force.The approach for deriving the lift force has been introduced.By comparison with the force exerted on a particle in a shear flow,the expression for the lift force acting on the particle has been present,which is orthogonal with the averaged temperature gradient and directed to the larger gradient zone.The impact of the lift force has been analyzed for thermophoresis with carbon nanotubes and the pattern on the wall above a radiator.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第5期1063-1066,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51356001
No.51406098
No.51136001
No.51322603)
教育部新世纪优秀人才支持计划
清华信息科学与技术国家实验室资助项目
中国博士后科学基金资助项目(No.2014M560967)
关键词
热泳
热泳升力
滑移流区
Saffman升力
thermophoresis
thermophoretic lift force
slip flow regime
saffman lift force
