Numerical Computation of Natural Convection of Nanofluid in an Open Wavy Porous Cavity Heated Partially

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY

Journal of Nanofluids Pub Date : 2023-10-01 DOI:10.1166/jon.2023.2050

Prabir Barman, P. Rao, Sandip Chowdhury

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Abstract

In this work, we emphasise the heat transfer and fluid flow due to buoyancy force in a wavy open porous cavity, placed horizontally having filled with porous media and, its top wall is being kept open, whereas the right cold wall is wavy and, its left vertical wall is heated partially, keeping all other walls at thermally insulated. The non-dimensional ψ − θ formulation of mass, momentum, and energy conservation laws for porous media are solved by the standard finite difference scheme for a wide range of pertinent parameters such as nanoparticle volume fraction (0.05 ≤ Φ ≤ 0.2), Rayleigh-Darcy number (10 ≤ Ra ≤ 103), length of heat source (0.25 ≤ ε ≤ 1), and parameters controlling waviness of right wall (1 ≤ N ≤ 5) and amplitude (0.05 ≤ a ≤ 0.25). The simulated results are presented in the form of streamlines and isotherms; global and local Nusselt numbers are computed. Obtained results are analyzed and it is observed that the convection process is augmented at the presence of nanoparticle for low Ra but decreases at high Ra for all pertinent parameters; also, the wall waviness augments convection low Ra.

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部分加热的开放式波浪形多孔腔中纳米流体的自然对流数值计算

在这项工作中，我们强调在一个水平放置、充满多孔介质的波浪形开放多孔空腔中，由于浮力而产生的传热和流体流动，其顶壁保持开放，而右侧冷壁呈波浪形，其左侧垂直壁部分加热，所有其他壁保持隔热。多孔介质的质量、动量和能量守恒定律的非维度 ψ - θ 公式是通过标准有限差分方案求解的，适用于各种相关参数，如纳米粒子体积分数（0.05 ≤ Φ ≤ 0.2）、瑞利-达西数（10 ≤ Ra ≤ 103）、热源长度（0.25 ≤ ε ≤ 1）以及控制右壁波浪度（1 ≤ N ≤ 5）和振幅（0.05 ≤ a ≤ 0.25）的参数。模拟结果以流线和等温线的形式呈现；计算了全局和局部的努塞尔特数。对得到的结果进行分析后发现，在所有相关参数下，当纳米粒子存在时，对流过程在低 Ra 时会增强，但在高 Ra 时会减弱；此外，壁面波浪度在低 Ra 时也会增强对流。

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

Journal of Nanofluids NANOSCIENCE & NANOTECHNOLOGY-

自引率

14.60%

发文量

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.