Analysis of combined pressure-driven and electroosmotic hydrothermal features of non-Newtonian nanofluid in variable cross-section microchannel with slip-dependent zeta potential

IF 6.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

alexandria engineering journal Pub Date : 2025-05-17 DOI:10.1016/j.aej.2025.05.033

Debanjan Banerjee , Sukumar Pati , Pankaj Biswas , László Baranyi

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Abstract

The present study investigates the hydrodynamic and thermal behavior of combined electroosmotic and pressure-driven flow of non-Newtonian nanofluid through a variable cross-section microchannel considering the effects of slip-dependent zeta potential, magnetic field, Joule heating, viscous dissipation and thermal radiation. The closed-form expressions of electrical double-layer potential, velocity, and temperature distributions have been derived using a biviscosity model of non-Newtonian fluid to compute the shear stress and Nusselt number (Nu). The divergence in the microchannel strengthens the influence of the magnetic field and weakens the influence of hydrodynamic slippage on the axial velocity. Moreover, the variation in channel height significantly affects the shear stress, with substantial impacts of the Hartmann number and apparent viscosity. The Nusselt number (Nu) increases with the divergence in the geometry and such increasing rate is higher for lower Hartmann numbers. Nusselt number becomes zero for higher radiation parameters in the narrow portion of the microchannel and alters significantly due to the apparent zeta potential. The nanoparticle volume fraction has a marginal effect on Nu except at the position of maximum channel height.

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具有滑移相关zeta电位的变截面微通道中非牛顿纳米流体压力驱动和电渗透联合热液特征分析

考虑滑移相关的zeta势、磁场、焦耳加热、粘性耗散和热辐射的影响，研究了电渗透和压力驱动的非牛顿纳米流体通过变截面微通道的流体动力和热行为。利用非牛顿流体的双粘度模型，推导了电双层势、速度和温度分布的封闭表达式，计算了剪切应力和努塞尔数（Nu）。微通道内的散度增强了磁场的影响，减弱了流体动力滑移对轴向速度的影响。此外，通道高度的变化对剪切应力有显著影响，哈特曼数和表观粘度对剪切应力的影响较大。努塞尔数（Nu）随几何散度的增大而增大，且Hartmann数越小，增加的速率越高。在微通道的狭窄部分，当辐射参数较高时，努塞尔数变为零，并且由于明显的zeta电位而发生显著变化。除了最大通道高度处，纳米颗粒体积分数对Nu的影响很小。

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

alexandria engineering journal Engineering-General Engineering

CiteScore

11.20

自引率

4.40%

发文量

1015

审稿时长

43 days

期刊介绍： Alexandria Engineering Journal is an international journal devoted to publishing high quality papers in the field of engineering and applied science. Alexandria Engineering Journal is cited in the Engineering Information Services (EIS) and the Chemical Abstracts (CA). The papers published in Alexandria Engineering Journal are grouped into five sections, according to the following classification: • Mechanical, Production, Marine and Textile Engineering • Electrical Engineering, Computer Science and Nuclear Engineering • Civil and Architecture Engineering • Chemical Engineering and Applied Sciences • Environmental Engineering