布置成涡结构微混合器内的流动与混合特性

doi:10.3969/j.issn.0438-1157.2013.07.004

化工学报 ›› 2013, Vol. 64 ›› Issue (7): 2328-2335.DOI: 10.3969/j.issn.0438-1157.2013.07.004

布置成涡结构微混合器内的流动与混合特性

李健, 夏国栋

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, 暨传热与能源利用北京市重点实验室, 北京 100124

收稿日期:2012-11-08 修回日期:2013-02-20 出版日期:2013-07-05 发布日期:2013-07-05
通讯作者: 夏国栋
作者简介:李健(1985- ),男,博士研究生。
基金资助:
国家自然科学基金项目(51176002);国家重点基础研究发展计划项目(2011CB710704);教育部博士点基金项目(20111103110009)。

Fluid flow and mixing characteristics in micromixer with vortex-generated structures

LI Jian, XIA Guodong

Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

Received:2012-11-08 Revised:2013-02-20 Online:2013-07-05 Published:2013-07-05
Supported by:
supported by the National Natural Science Foundation of China (51176002),the National Basic Research Program of China (2011CB710704)and the Research Fund for the Doctoral Program of Higher Education (20111103110009).

摘要/Abstract

摘要： 基于成涡结构强化混合原理设计了一种改进型的平面被动式微混合器。采用商业软件CFD-ACE+对该结构微混合器的混合特性进行了三维数值模拟和结构优化,进一步揭示该微混合器结构对通道内流体流动与混合特性的影响。结合混合通道内流体的浓度和流型分布的数值和实验结果可知,该新型微混合器在布置成涡结构的弯曲通道内形成了扩展涡、分离涡和Dean涡,实现了涡系的叠加和强化,加大了流体间的扰动,从而增加了流体的接触面积强化混合;在综合考虑流体混合强度和压降分布等因素下,成涡结构正向布置且缝宽比W_d/W=1/4,厚宽比B/W=3/10,布置角度θ_a=120°的该微混合器在较广Re范围内的混合效果显著。

关键词: 微混合器, 成涡结构, 弯曲通道, 结构优化

Abstract: A design for modified planar passive micromixer based on the concept of vortex-generated structure enhanced mixing is described in this work.By using computational fluid dynamics CFD-ACE+,three-dimensional numerical simulation and structural optimization for mixing were performed in order to reveal the structural influence on the flow feature and mixing characteristics.Experimental data were used to validate the numerical analysis.The computational and experimental results for the concentration distributions and flow patterns demonstrate that the expansion vortices,separated vortices and Dean vortices appear in the curved channel of this modified micromixer,which is arranged to vortex-generated structures.The combination and enhancement of the vortex system increase the fluid disturbance,effectively improving the contact area of fluid and accelerating the mixing process.Based on comprehensive consideration of mixing efficiency and pressure drop distribution,the structural design adopts the vortex-generated structure with regular arrangement,and the gap width ratio W_d/W,thickness-width ratio B/W,and arrangement angle θ_a are equal to 1/4,3/10,and 120°,respectively.Significant mixing effect of fluid in the micromixer can be realized in a wide range of Reynolds number.

Key words: micromixer, vortex-generated structure, curved channel, structural optimization

中图分类号:

TQ027.1

李健, 夏国栋. 布置成涡结构微混合器内的流动与混合特性[J]. 化工学报, 2013, 64(7): 2328-2335.

LI Jian, XIA Guodong. Fluid flow and mixing characteristics in micromixer with vortex-generated structures[J]. CIESC Journal, 2013, 64(7): 2328-2335.

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布置成涡结构微混合器内的流动与混合特性

Fluid flow and mixing characteristics in micromixer with vortex-generated structures

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