微尺度库埃特流动与传热的数值研究  

Numerical Study on Flow and Heat Transfer Characteristics for Micro Couette Flow

作　　者：黄蕾[1] 王彦红[1] 

机构地区：[1]洛阳理工学院土木工程系,河南洛阳471023

出　　处：《建筑节能》2008年第9期25-28,共4页BUILDING ENERGY EFFICIENCY

摘　　要：微细通道内流体流动的研究是一个新兴的研究领域。以微库埃特流作为流动模型进行研究,通过对一般微流动的物理机理的探讨,建立相应的速度滑移和温度跳跃边界条件,采用宏观方法来模拟稀薄气体流动。通过对不同Kn数值下速度、温度、压力分布曲线分析,得出结论:库埃特流是靠剪切力流动的,在流动方向上存在剪切应力;黏性热引起气体温度增加,且Kn数值越大,温度增加越快;在过渡区的开始处热流取得最大值。Couette flow was discussed. Based on the general flow behaviour mechanism, the velocity slip and temperature jump boundary conditions were set up, The velocity, temperature and pressure distributing at different Knudsen values were analyzed. The result shows that Couette flow was driven by shear stress, and the shear stress exists inflow direction. Viscous heat caused the increase of the fluid＇s temperature. The bigger the Knudsen values, the faster the increase of the temperature. The heat flux got the maximum at the beginning of transition region.

关 键 词：微尺度流动 库埃特流 剪切力 速度滑移 温度跳跃 

分 类 号：TU111.195[建筑科学—建筑理论]