Abstract

The heat transfer and fluid flow in a corrugated square cavity filled with nanofluid are investigated numerically. The opposite vertical walls are taken as having different temperatures, while the horizontal walls are considered as adiabatic. The nanofluid is copper-water, and three different shapes of corrugated boundaries are investigated here: wavy, triangular, and rectangular. The governing equations are solved with application of the SIMPLE algorithm, based on the control volume approach. This study investigates the effect of several parameters on the heat transfer: the boundary shape, Rayleigh number, nano-particle volume fraction, nano-particle diameter, cycle number, and triangle wave amplitude. The results show that corrugated boundaries reduce the heat transfer. In addition, it is found out that a nanofluid with \(\phi\) of about 0.02 has the highest value of heat transfer enhancement.

中文翻译：

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纳米颗粒对波纹墙外壳自然对流的影响

摘要

数值研究了填充有纳米流体的波纹方形腔中的传热和流体流动。相对的垂直壁被认为具有不同的温度，而水平壁被认为是绝热的。纳米流体是铜-水，这里研究了三种不同形状的波纹边界：波浪形、三角形和矩形。基于控制体积方法，应用 SIMPLE 算法求解控制方程。本研究研究了几个参数对传热的影响：边界形状、瑞利数、纳米粒子体积分数、纳米粒子直径、循环数和三角波振幅。结果表明，波纹边界会降低热传递。此外，还发现纳米流体具有 \(\phi\) 约为 0.02 具有最高的传热增强值。