非对称分离重组扇形空腔微混合器的混合特性  

Mixing performance of asymmetric split and recombine micromixer with fan-shaped cavity

作　　者：夏国栋[1] 李健[1] 吴宏杰[1] 周明正[1] 

机构地区：[1]北京工业大学环境与能源工程学院强化传热与过程节能教育部重点实验室,北京100124

出　　处：《化工学报》2011年第5期1219-1225,共7页CIESC Journal

基　　金：北京市自然科学基金项目(3092009);北京市属高校人才强教计划项目(PHR200906104);北京工业大学第八届研究生科技基金项目(YKJ-2010-3552)~~

摘　　要：基于平面内非对称分离重组微混合原理设计了一种新型的被动式微混合器,并对该结构微混合器的混合特性进行了三维数值模拟。模型使用有限体积法离散、SIMPLE算法进行层流计算,采用混合强度值作为衡量指标,分析了Reynolds数在1~80范围间的混合强度值变化。分析结果显示,在次通道上布置扇形空腔对非对称式微混合器的混合强度值有明显提高,同时扇形空腔的几何结构参数值对该微混合器的混合效果也有一定影响。本文模拟结果在综合考虑混合强度与泵功消耗等条件下,当主次通道宽度与扇形空腔结构宽度比为（w3/w1）=1/3时非对称分离重组扇形空腔微混合器的混合强度值可达到78%左右。A novel design of passive micromixer based on mechanism of planar asymmetric split and recombine（P-ASAR）of fluid stream was proposed.Mixing performance of this micromixer was analyzed numerically with three-dimensional Navier-Stokes equations.The steady laminar flow was solved by using the finite-volume method and SIMPLE algorithm.The mixing index as the measure of mixing performance,was investigated at a range of Reynolds numbers（1—80）.The result showed significant increase of mixing index for the P-ASAR micromixer with fan-shaped cavity in the sub-channel.The geometrical parameters of fan-shaped cavity affected mixing index of this type of micromixer.With mixing intensity and pump power consumption in mind,mixing index of the P-ASAR micromixer with fan-shaped cavity could reach around 78% when the width ratio of major sub-channel to fan-shaped cavity channel is 1/3.

关 键 词：非对称分离重组 扇形空腔 混合特性 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]