摘要
应用格子Boltzmann方法研究单相流体流过矩形和三角形微通道结构的对流换热特性。数值模拟结果展示出流体在不同微通道中的速度场和温度场。从温度场结果可发现,流体流经微通道时会在热壁面附近形成热边界层,并且热边界层的厚度随雷诺数Re的增大而变薄。另外,通过出口温度和努塞尔数Nu等物理量定量研究两种微通道结构的换热特性。数值结果表明,矩形微通道结构的换热性能优于三角形微通道结构。在场协同原理基础上,进一步分析造成两种微通道换热性能不同的原因。
In this paper, convection heat transfer characteristic of fluid flowing through two different micro-channel structures is studied using lattice Boltzmann method. The velocity and temperature field of fluid in different micro- channel structures are presented by numerical simulation results. It can be found that a thermal boundary layer is formed near the heated wall when fluid flowing through the micro-channel. And the thickness of thermal boundary layer decreases with Re increasing. In addition, the heat transfer characteristics of two micro-channel structures are researched by outlet temperature and Nu, quantitatively. Numerical results indicated that heat transfer performance of rectangular micro-channel is superior to that of triangular micro-channel. Based on field synergy principle, the reason why two micro- channel structures have different heat transfer characteristics is analyzed.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第9期2344-2349,共6页
Acta Energiae Solaris Sinica
基金
国家民委科研项目(14DLZ015)
辽宁省教育厅科学研究一般项目(L2015131)
中央高校基本科研业务费(DC201501052)
关键词
格子BOLTZMANN方法
微通道结构
传热特性
场协同原理
热边界层
lattice Boltzmann method
micro- channel structure
heat transfer characteristic
field synergy principle
thermal boundary layer
