一种基于特斯拉阀结构的微混合器设计、模拟及其试验研究

doi:10.16085/j.issn.1000-6613.2020-1894

摘要/Abstract

摘要：

微混合器是常见的用于流体混合的设备，由于特斯拉阀结构简单稳定，流动方式特殊，具有开发微混合器的潜质。本文通过数值模拟的方法，在特斯拉阀结构以及前期研究的基础上，改进并优化了一种特斯拉型的微混合器，利用流体力学软件（Fluent）研究了不同θ角度以及不同雷诺数下的混合程度，并对该结构的混合效果进行了流场分析以及试验验证。结果表明，该新型微混合器的最佳几何参数为θ=30°。两股流体在Re=52.5、混合长度为50mm时，混合程度η=0.9647，体系压降为330.45Pa。该微混合器的操作压降较低，相对于先前结构，混合性能更好，混合长度更短。

关键词: 微混合器, 特斯拉阀, 数值模拟, 流场分析

Abstract:

Micromixer is a common equipment used for fluid mixing. Tesla valve has the potentiality to develop into micromixer due to its simple, stable structure and the special flow mode. In this paper, a Tesla-type micromixer was designed and optimized on the basis of the Tesla valve and previous research by numerical simulation. The fluid dynamics software (Fluent) was used to study the mixing index under different angles (θ) and different Reynolds numbers. In addition, the mixing index of the structure was verified by flow field analysis and experiments. The results showed that the best geometric parameter of new Tesla-type micromixer is θ=30°. When Reynolds number is 52.5, the mixing length of two fluids is 50mm, the mixing index η is 0.9647 and pressure drop of the system is 330.45Pa. Compared to previous structures, the micromixer in this study has lower pressure drop, higher mixing index and shorter mixing length.

Key words: micromixer, Tesla valve, numerical simulation, flow fluid analysis

中图分类号:

TQ027.1

翁祥宇, 严生虎, 张跃, 刘建武, 沈介发. 一种基于特斯拉阀结构的微混合器设计、模拟及其试验研究[J]. 化工进展, 2021, 40(8): 4173-4178.

WENG Xiangyu, YAN Shenghu, ZHANG Yue, LIU Jianwu, SHEN Jiefa. Design, simulation and experimental study of a micromixer based on Tesla valve structure[J]. Chemical Industry and Engineering Progress, 2021, 40(8): 4173-4178.

图/表 12

图1 两种结构对比

图2 改进微型混合器结构

图3 微混合器设计比较从左往右：Hong的基础结构、本文的改进型结构、T型空管结构

图4 微混合器混合试验装置1—去离子水烧杯；2—红色墨水烧杯；3、4—微量注射泵；5—微混合器；6—废液收集瓶

图5 改进型结构不同Re条件下单周期流动时θ值对混合程度的影响

图6 改进型结构不同Re条件下多周期流动的混合程度比较

图7 改进型结构多周期流动下混合程度（以A的体积分数为参考）

图8 改进型结构不同Re条件下多周期流动的压降比较

图9 Re=52.5时3种结构微混合器的混合程度比较

图10 Re=52.5时两种结构的特斯拉型微混合器流线对比

图11 改进型特斯拉型微混合器混合效果对比验证

图12 总流量变化对改进型结构混合效果影响

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