非平行里加板通道中电磁混合纳米流体流动的局部热非平衡性方法

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY Journal of Nanofluids Pub Date : 2023-10-01 DOI:10.1166/jon.2023.2104
T. Sharma, Rakesh Kumar, Ali J. Chamkha
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引用次数: 0

摘要

在电子散热装置、微通道散热器和带角度的混频器/扩散器中,流体以非平行配置流动。这些应用中的流体很容易发生流动分离和分叉。为了解决这类问题,本研究提出了一种新颖的想法,即采用会聚或发散型里加板通道。利用里加板产生横流磁场和电场,从而产生指数衰减的洛伦兹力。此外,还考虑用具有可变渗透性的多孔基质来填充里加板通道。混合纳米流体与多孔介质之间的热平衡状态被忽略,即采用局部热非平衡(LTNE)方法来模拟能量平衡方程。利用切比雪夫伪谱准线性化方法解决了指导方程的无维度形式。在汇流和发散流状态下,加入里加片后传热率分别提高了 21.42% 和 63.12%。在汇流/发散流状态下,表皮摩擦系数随修正哈特曼数(Ha*)和孔隙率(ε)的增加而降低。LTNE 状态随尼尔德数 (Ni)、热导率比 (γ) 和 ε 的变化而转变为 LTE 状态。
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A Local Thermal Non-Equilibrium Approach to an Electromagnetic Hybrid Nanofluid Flow in a Non-Parallel Riga Plate Channel
The fluid flow in a non-parallel configuration exists in the electronic heat removal devices, microchannel heat sinks, and angled confusers/diffusers. The fluids in these applications are prone to flow separation and bifurcations. To deal with such type of problems, a novel idea of a converging or diverging type Riga plate channel is introduced in this study. The Riga plates are utilised to produce the cross-flow magnetic and electric fields which give rise to an exponentially decaying Lorentz force. Also, a porous matrix with variable permeability is considered to fill the Riga plate channel. The thermal equilibrium state between the hybrid nanofluid and porous media is ignored i.e., a local thermal non-equilibrium (LTNE) approach is adopted to model the energy balance equations. The dimension-free form of the guiding equations is tackled by using the Chebyshev pseudospectral quasi-linearization method. The heat transfer rate is respectively incremented by 21.42% and 63.12% in the converging and diverging flow regimes, with the inclusion of a Riga Sheet. The skin friction coefficient is depressed with modified Hartmann number (Ha*) and porosity (ε) for the converging/diverging flow regime. The LTNE state alters to the LTE with Nield number (Ni), thermal conductivity ratio (γ) and ε.
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来源期刊
Journal of Nanofluids
Journal of Nanofluids NANOSCIENCE & NANOTECHNOLOGY-
自引率
14.60%
发文量
89
期刊介绍: Journal of Nanofluids (JON) is an international multidisciplinary peer-reviewed journal covering a wide range of research topics in the field of nanofluids and fluid science. It is an ideal and unique reference source for scientists and engineers working in this important and emerging research field of science, engineering and technology. The journal publishes full research papers, review articles with author''s photo and short biography, and communications of important new findings encompassing the fundamental and applied research in all aspects of science and engineering of nanofluids and fluid science related developing technologies.
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