Effect of structural parameters on fluid flow and mixing characteristics in micromixer with gaps and baffles

doi:10.11949/j.issn.0438-1157.20150086

CIESC Journal ›› 2015, Vol. 66 ›› Issue (10): 3857-3865.DOI: 10.11949/j.issn.0438-1157.20150086

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Effect of structural parameters on fluid flow and mixing characteristics in micromixer with gaps and baffles

LI Yifan, XIA Guodong, WANG Jun

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

Received:2015-01-20 Revised:2015-05-07 Online:2015-10-05 Published:2015-10-05
Supported by:
supported by the National Natural Science Foundation of China (51176002), the National Basic Research Program of China (2011CB710704) and the Natural Science Foundation of Beijing (3142004).

结构参数对布置窄缝和挡板的微混合器内流体流动和混合的影响

李艺凡, 夏国栋, 王军

北京工业大学环境与能源学院强化传热与过程节能教育部重点实验室, 北京 100124

通讯作者: 夏国栋
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);北京市自然科学基金项目(3142004)。

Abstract

Abstract:

A passive micromixer with gaps and baffles was proposed based on the principle of chaotic mixing and the fluid flow and mixing characteristics in the micromixer were studied by three-dimensional numerical simulation and visualization experiment. Expanded vortices and separated vortices were generated in the horizontal plane and counter-rotating vortices formed in the cross-sectional plane perpendicular to the flow direction by the combination of gaps and baffles. The mixing efficiency was significantly improved by the multidirectional vortices. The geometrical parameters of gaps and baffles had great effect on the fluid flow and mixing. Based on the consideration of mixing efficiency and pressure drop, the effect of gap width, gap length and baffle height on the comprehensive performance of the micromixer was investigated by the field synergy principle. The optimal structural parameters were presented with varying Reynolds number.

Key words: microscale, mixing, field synergy principle, structural optimization, numerical simulation

摘要：

基于混沌对流原理设计了一种布置窄缝和挡板结构的被动式微混合器,并采用三维数值模拟和可视化实验对该微混合器内流体流动与混合特性进行了研究。窄缝和挡板的共同作用使微混合器水平面内形成了扩展涡和分离涡,垂直流动方向的截面内形成了对称的反向旋涡,多维度涡系显著提高了混合效率。窄缝和挡板的结构尺寸对流体流动和混合有重要影响。综合考虑混合强度和压降,利用场协同原理分析窄缝宽度、窄缝长度、挡板高度对微混合器综合性能的影响并得到了不同Reynolds数条件下的最优结构参数。

关键词: 微尺度, 混合, 场协同原理, 结构优化, 数值模拟

CLC Number:

TQ027.1

LI Yifan, XIA Guodong, WANG Jun. Effect of structural parameters on fluid flow and mixing characteristics in micromixer with gaps and baffles[J]. CIESC Journal, 2015, 66(10): 3857-3865.

李艺凡, 夏国栋, 王军. 结构参数对布置窄缝和挡板的微混合器内流体流动和混合的影响[J]. 化工学报, 2015, 66(10): 3857-3865.

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Effect of structural parameters on fluid flow and mixing characteristics in micromixer with gaps and baffles

结构参数对布置窄缝和挡板的微混合器内流体流动和混合的影响

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