Numerical study of fluid-structure interaction for enhanced heat transfer in microchannels with an oscillating elastic wall

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2024-11-13 DOI:10.1016/j.csite.2024.105480

Farzad Havasi , Seyyed Hossein Hosseini , Abdolhamid Azizi , Masoud Seidi , Sajjad Ahangar Zonoozi , Goodarz Ahmadi

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Abstract

The present numerical study explores the performance of fluid-structure interaction (FSI) in a microchannel with an oscillating elastic wall. A two-dimensional (2D) Computational Fluid Dynamics (CFD) simulation was performed to investigate the influence of the elastic wall's frequency and amplitude on fluid flow behavior, pressure drop, and heat transfer enhancement. The FSI governing equations were solved using the Arbitrary Lagrangian-Eulerian (ALE) method. The results indicated that the Nusselt number (Nu) decreases as oscillation frequency increases. In contrast, the Nu increased linearly with the oscillation amplitude. Additionally, the Prandtl number (Pr) showed an insignificant influence on the Nu number for the studied operating range. An optimal operating condition was identified for the microchannel with an oscillating wall, achieving a spatial average Nu number of 16.796 compared to 14.577 for a simple microchannel channel, representing a 15.23 %% enhancement in heat transfer. A correlation is derived for the spatial average Nu number as a function of the Reynolds number (Re), Strouhal number (St), Pr, and vibration amplitude ratio, providing a valuable tool for designing and optimizing microchannel systems with FSI. Finally, the Maxwell boundary conditions are incorporated into the simulation of a microchannel with a vibrating upper wall to evaluate the slip conditions.

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关于流体与结构相互作用的数值研究，以增强带摆动弹性壁的微通道中的传热效果

本数值研究探讨了带有振荡弹性壁的微通道中流体与结构相互作用（FSI）的性能。通过二维（2D）计算流体动力学（CFD）模拟，研究了弹性壁的频率和振幅对流体流动行为、压降和传热增强的影响。采用任意拉格朗日-欧拉（ALE）方法求解了 FSI 主导方程。结果表明，努塞尔特数（Nu）随着振荡频率的增加而降低。相反，Nu 随振荡振幅线性增加。此外，在研究的工作范围内，普朗特数（Pr）对努氏数的影响不大。带振荡壁的微通道确定了最佳运行条件，其空间平均 Nu 数为 16.796，而简单微通道的 Nu 数为 14.577，换热效率提高了 15.23%%。得出了空间平均 Nu 数与雷诺数 (Re)、斯特劳哈尔数 (St)、Pr 和振动振幅比之间的相关性，为设计和优化带有 FSI 的微通道系统提供了宝贵的工具。最后，将麦克斯韦边界条件纳入带有振动上壁的微通道模拟，以评估滑移条件。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.