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首页> 外文期刊>Journal of Heat Transfer >Numerical Study on Mixed Convection and Entropy Generation of a Nanofluid in a Lid-Driven Square Enclosure
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Numerical Study on Mixed Convection and Entropy Generation of a Nanofluid in a Lid-Driven Square Enclosure

机译：盖子驱动的方形外壳中纳米流体混合对流和熵产生的数值研究

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摘要

A numerical investigation of mixed convection due to a copper-water nanofluid in an enclosure is presented. The mixed convection is governed by moving the upper lid of the enclosure and imposing a vertical temperature gradient. The transport equations for fluid and heat are modeled by using the Boussinesq approximation. A modified form of the control volume based SIMPLET algorithm is used for the solution of the transport equations. The fluid flow and heat transfer characteristics are studied for a wide range of Reynolds number and Grashof number so as to have the Richardson number greater or less than 1. The nanoparticle volume fraction is considered up to 20%. Heat flow patterns are analyzed through the energy flux vector. The rate of enhancement in heat transfer due to the addition of nanoparticles is analyzed. The entropy generation and Bejan number are evaluated to demonstrate the thermodynamic optimization of the mixed convection. We have obtained the enhancement rate in heat transfer and entropy generation in nanofluid for a wide range of parameter values.
机译：提出了对封闭空间中铜水纳米流体引起的混合对流的数值研究。通过移动外壳的上盖并施加垂直温度梯度来控制混合对流。使用Boussinesq近似对流体和热量的传输方程进行建模。基于控制量的SIMPLET算法的一种改进形式用于求解运输方程。研究了广泛的雷诺数和格拉斯霍夫数的流体流动和传热特性，以使理查森数大于或小于1。纳米粒子的体积分数被认为高达20％。通过能量通量矢量分析热流模式。分析了由于添加纳米颗粒而导致的传热增强速率。评估熵的产生和Bejan数，以证明混合对流的热力学优化。我们已经获得了宽范围的参数值在纳米流体中传热和熵产生的提高速率。

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