Effect of geometric optimization and electrical control on the mixing performance of a dual-obstacle electroosmotic micromixer

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-07-09 DOI:10.1016/j.ijthermalsci.2025.110146

Reza Shahsavandi , Ali Khoshnod , Khashayar Hosseinzadeh

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引用次数: 0

Abstract

In this study, an electroosmotic micromixer that features two fixed obstacles within the mixing chamber, simulated by a 2D transient model using Comsol Multiphysics software based on the finite element method. The study aimed to optimize the location and size of the obstacles to improve mixing as well as pressure drop reduction. To this end, the Taguchi method and response surface methodology (RSM) were utilized in obtaining the optimized values of the geometrical parameters: r₁, r₂ (radius of the first and second obstacle), x₁, x₂ (horizontal distance from the center of the first and second obstacle to the center of the micromixer), y₁, y₂ (vertical distance from the center of the first and second obstacle to the center of the micromixer), which resulted in 2.5, 2.6, 12.13, 7.63, 8.68, and 18.77 μm, respectively, and a minimum 2.5 % and 5 % increase in the average mixing index and mixing efficiency. Following the determination of the optimum parameters of geometry, the mixing performance was examined under different conditions of alternative current frequency, inlet velocity, voltage, and phase lag. Increasing the electrode voltage from 0.1 to 0.5 V raised the mixing index to 84.75 %. Additionally, using a phase lag of π/2 enhanced the average mixing index, achieving 88.41 % compared to scenarios without phase lag.

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几何优化和电气控制对双障碍电渗透微混合器混合性能的影响

在本研究中，采用Comsol Multiphysics软件基于有限元法建立了一个二维瞬态模型，模拟了混合室内具有两个固定障碍物的电渗透微混合器。该研究旨在优化障碍物的位置和大小，以改善混合并降低压降。为此，利用田口法和响应面法（RSM）获得几何参数的优化值：R1, r2（第一和第二障碍物半径），x1, x2（第一和第二障碍物中心到微混合器中心的水平距离），y1, y2（第一和第二障碍物中心到微混合器中心的垂直距离），分别增加2.5,2.6,12.13,7.63,8.68和18.77 μm，平均混合指数和混合效率分别提高2.5%和5%。在确定最佳几何参数的基础上，研究了交流频率、进口速度、电压和相位滞后等不同条件下的混合性能。将电极电压从0.1 V提高到0.5 V，混合指数提高到84.75%。此外，使用π/2的相位滞后提高了平均混合指数，与没有相位滞后的情况相比，平均混合指数达到了88.41%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.