3D-不对称菱形被动式微混合器混合特性

发布时间：2018-03-14 11:36

本文选题：微混合器　切入点：微通道　出处：《光学精密工程》2017年09期 　论文类型：期刊论文

【摘要】：提高微混合器雷诺数的适用范围和混合强度是微混合器设计的发展趋势。本文基于非对称分离重组混合原理设计、制作了一种3D-不对称菱形被动式微混合器,并借助数值分析方法和可视化实验对混合强度和混合状态的变化进行了研究。研究发现:在低Re(0.01~10)范围内,两组分间的混合以扩散混合为主,随着Re的增加,流速对混合强度的影响有一定下降;在较高Re(10~200)范围内,受流速增加的影响,流体间不平衡微流惯性碰撞逐渐成为影响混合的主要因素。此时,混合强度随流速的增加逐渐增强并趋于平稳。对Re在0.01~200内的微混合器展开研究,分析了宽缝比Ws/S、分合角θ、宽厚比H/S等结构尺寸对混合强度的影响。通过综合考虑流体混合强度和通道压降的变化情况,确定最佳通道结构尺寸为Ws/S=0.2、θ=45°、H/S=0.5,此时微混合器的混合强度可维持在78%以上。与传统平面对称分合式混合器相比,设计制作的3D-不对称菱形被动式微混合器混合强度有较大的提高,验证了本文设计结构的有效性。
[Abstract]:Increasing the range of Reynolds number and mixing strength of micro mixer is the development trend of micro mixer design. Based on the principle of asymmetric separation and recombination, a 3D- asymmetrical diamond passive micromixer is fabricated in this paper. The variation of mixing strength and mixing state is studied by means of numerical analysis and visualization experiment. It is found that in the range of low Re0. 01 ~ (10), the mixing between the two components is mainly diffusive mixing, and with the increase of re, The effect of flow velocity on the mixing strength is decreased, and in the range of higher velocity, the inertial collision between the unbalance microflows becomes the main factor affecting the mixing in the range of higher velocity. The mixing strength increases gradually with the increase of flow velocity and tends to be stable. The effects of the structure sizes such as wide slit ratio Ws / S, split angle 胃 and width to thickness ratio H / S on the mixing strength are analyzed. The variation of fluid mixing strength and channel pressure drop is considered comprehensively. It is determined that the optimum channel structure size is Ws / S _ 2, 胃 ~ (45 掳) H / S _ (0.5), and the mixing strength of the micro-mixer can be maintained above 78%. Compared with the traditional planar symmetrical split-type mixer, the mixing strength of the 3D-asymmetric diamond passive micromixer designed and fabricated has been greatly improved. The validity of the design structure is verified.
【作者单位】：浙江工业大学特种装备制造与先进加工技术教育部重点实验室;
【基金】：国家自然科学基金资助项目(No.51775510,No.11372280) 浙江省科技厅公益项目(No.2016C31G2020052,No.2016C31G2020044)
【分类号】：TQ051.71

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