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首页> 外文期刊>Journal of Molecular Liquids >Heat transfer and entropy generation of the nanofluid flow inside sinusoidal wavy channels
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Heat transfer and entropy generation of the nanofluid flow inside sinusoidal wavy channels

机译：正弦波沟道内纳米流体流动的传热和熵生成

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摘要

Corrugating channel walls is a way to enhance heat transfer in heat exchangers. In the current investigation, the entropy generation minimization approach has been employed to optimize heat transfer and fluid flow within a wavy channel. A numerical method has been built to compute entropy generation rate in a sinusoidal wavy-wall channel with copper-water (Cu-water) nanofluid flow. The governing equations have been discretized using finite volume method for a two-dimensional steady flow. The effects of geometrical and flow parameters, including nanoparticles volume fraction (0.01 phi 0.05), Richardson number (0.1 Ri 10), wave amplitude ratio (0.1 alpha 03) and wave length ratio (1 lambda 3), have been investigated. Results reveal that increasing nano particle volume fraction within investigated Richardson number will increase Nusselt number. In addition, the maximum entropy generation rate declines as Richarson number increases. The optimal wave amplitude ratio (corresponding to lowest entropy generation), for wave length ratios of lambda = 1 and lambda = 2, found to be alpha = 0.2. Also, for wave length ratio of lambda = 3, the minimum entropy generation approximately occurs at alpha = 0.1. (C) 2018 Elsevier B.V. All rights reserved.
机译：波纹通道壁是增强热交换器中传热的一种方法。在本前研究中，已经采用熵产生最小化方法来优化波浪通道内的传热和流体流动。建立了一种数值方法以计算具有铜 - 水（Cu水）纳米流体流动的正弦波壁通道中的熵产生速率。通过用于二维稳定流动的有限体积法离散化控制方程。几何和流动参数的影响，包括纳米颗粒体积分数（0.01＆ 0.05），Richardson数（0.1＆ 10），波振幅比（0.1＆α03）和波长比（已经研究了1＆λ3）。结果表明，在研究的Richardson号内增加纳米粒子体积分数将增加营养数。此外，随着Richarson数量的增加，最大熵产生率下降。发现Lambda = 1和Lambda = 2的波长比（对应于最低熵产生）的最佳波振幅比​​（对应于最低熵生成），发现是α= 0.2。而且，对于Lambda = 3的波长比，最小熵产生大致发生在α= 0.1。 （c）2018年elestvier b.v.保留所有权利。

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