粗糙度对大高宽比槽道内流动影响的数值模拟  

Numerical Simulation of Surface Roughness Effect in Large Height-Width Ratio Mini-channel Flows

作　　者：刘东[1] 蒋斌[1] 刘明侯[2] 

机构地区：[1]西南科技大学土木工程与建筑学院,绵阳621010 [2]中国科学技术大学热科学和能源工程学院,合肥230027

出　　处：《计算物理》2013年第5期759-765,共7页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(51306156);四川省教育厅资助科研项目(11ZA132&11ZB110);西南科技大学博士基金(11zx7159)资助项目

摘　　要：基于确定表面粗糙结构形状的PML模型模拟表面粗糙度对大高宽比小槽道内流动特性的影响,并与3-D模拟结果对比,结果较为一致.基于该模型对不同的流速和不同的粗糙度进行模拟,结果表明:表面粗糙度导致槽道内出现速度线性分布的流动底层.Re数相同时,单位长度压降与相对粗糙度成二次方关系.粗糙单元高度相同时,压降随Re线性增加.A PML model based on fixed surface roughness is used in simulation of surface roughness effect on flow in mini-channels. Compared with 3-D simulation, results of pressure drop agree well. With PML model and 3-D model we simulate different flow rates and roughness, it shows that surface roughness results in speed linear flow substrate. Pressure drop and relative roughness follow a secondary power relation as Re number is fixed. Pressure drop increased linearly with Re number as roughness elements is equal.

关 键 词：小槽道 粗糙度 PML模型 

分 类 号：TK124[动力工程及工程热物理—工程热物理]