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首页> 外文期刊>Journal of thermal analysis and calorimetry >Comparative study of mixed convection heat transfer of water-Cu nanofluid in an enclosure having multiple rotating circular cylinders with different configurations and considering harmonic cylinders rotation
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Comparative study of mixed convection heat transfer of water-Cu nanofluid in an enclosure having multiple rotating circular cylinders with different configurations and considering harmonic cylinders rotation

机译：具有不同配置的多旋转圆柱体水 - Cu纳米流体混合对流传热的比较研究，其考虑谐波缸旋转

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摘要

In the present study, heat transfer in a lid-driven square cavity in the existence of four rotating cylinders having harmonic motion was investigated numerically for different parameters such as Richardson number (0.1 <= Ri <= 10), the volume fraction of the nanoparticles (0 <= phi <= 0.03) and Reynolds number (86.2 <= Re <= 862). The enclosure filled with water-Cu nanofluids. Seven different cases were studied to find the best position and diameter ratio of cylinders. The results of this study presented in term of contours, Nusselt number, velocity profile, PEC number, entropy generation. This study demonstrated that heat transfer affected by the inertial force, buoyancy force, and changing in thermophysical properties of the base-fluid. Also, we found that the combination of harmonic motion and decrease in space between walls and cylinders makes the heat transfer behavior and trend, unpredictable. Another outcome of this numerical study is the effect of adding nanoparticle to pure water. In general, increasing the concentration of nanoparticles in pure water improved the thermophysical properties of the fluid. However, in some cases, shear effects and buoyancy forces changed this improvement.
机译：在本研究中，数值研究了在不同参数下，如理查森数（0.1<=Ri<=10）、纳米颗粒的体积分数（0<=phi<=0.03）和雷诺数（86.2<=Re<=862），盖子驱动方腔中存在四个具有谐波运动的旋转圆柱时的传热。外壳充满了水和铜纳米流体。研究了七种不同的情况，以找到气缸的最佳位置和直径比。这项研究的结果以等高线、努塞尔数、速度剖面、PEC数和熵产生的形式呈现。这项研究表明，传热受到惯性力、浮力和基础流体热物理性质变化的影响。此外，我们还发现，简谐运动和壁面和圆柱体之间空间的减少相结合，使得传热行为和趋势不可预测。这项数值研究的另一个结果是向纯水中添加纳米颗粒的效果。一般来说，增加纯水中纳米颗粒的浓度可以改善流体的热物理性质。然而，在某些情况下，剪切效应和浮力改变了这种改善。

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