Exploring fluid flow in microchannels with branching and variable constrictions

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION Microfluidics and Nanofluidics Pub Date : 2024-10-08 DOI:10.1007/s10404-024-02765-5
Rakesh Kumar, Amritendu Bhuson Ghosh, Bidisha Borah, Rajaram Lakkaraju, Arnab Atta
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Abstract

We employ a three-dimensional numerical model to analyze the dynamics of single-phase flow in a parallel branched microchannel with varying geometric dimensions of constrictions. The primary objective is to delve into the intricacies of flow within microdevices featuring a branched network and constrictions. The findings illustrate nonlinear variations in velocity, pressure, acceleration, and shear stress along the streamwise direction, underscoring their significant dependence on the converging/diverging angles of the constrictions. To gain deeper insights into the effects of geometric parameters resulting from converging/diverging constrictions in microchannels, a geometric Reynolds number is introduced as the governing parameter for flow transition, further highlighting the novel approach. Our results demonstrate a notable improvement in the magnitude of inertial forces, a feature uncommon in simple microchannels. From the results, it is asserted that microdevices with higher converging–diverging angles combined with lower width ratios are a preferable choice compared to those with lower converging–diverging angles and higher width ratios. Such configurations exhibit lower pumping power, contributing to enhanced energy efficiency. These findings provide fundamental insights that can guide the design of necessary modifications aimed at improving the performance of micropumps or microvalves.

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探索具有分支和可变收缩的微通道中的流体流动
我们采用三维数值模型来分析单相流在具有不同几何尺寸约束的平行分支微通道中的动态。主要目的是深入研究具有分支网络和约束的微装置内流动的复杂性。研究结果表明,速度、压力、加速度和剪切应力沿流向呈非线性变化,并强调了它们与收缩的收敛/发散角之间的重要关系。为了更深入地了解微通道中收敛/发散收缩所产生的几何参数的影响,我们引入了几何雷诺数作为流动转换的控制参数,进一步突出了这种新方法。我们的研究结果表明,惯性力的大小明显改善,这在简单微通道中并不常见。根据这些结果,我们可以断言,与具有较小聚散角和较高宽比的微装置相比,具有较大聚散角和较低宽比的微装置是一种更可取的选择。这种配置显示出较低的泵功率,有助于提高能效。这些发现提供了基本见解,可以指导设计必要的修改,从而提高微泵或微阀的性能。
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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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