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Pulsating nanofluids jet impingement cooling of a heated horizontal surface

机译:加热的水平表面的脉动纳米流体射流冲击冷却

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摘要

In this study, a numerical study of pulsating rectangular jet with nanofluids is presented. The aim of this work is to numerically investigate the effects of various parameters such as pulsating frequency, Reynolds number, nanoparticle volume fraction on the fluid flow and heat transfer characteristics. The unsteady Navier-Stokes and energy equations are solved with a commercial finite volume based code. It is observed in the steady case, adding nanoparticles increases the peak value of the Nusselt number at the stagnation point and spatial-averaged Nusselt number along the impingement plate. Heat transfer enhancement up to 18.8% is obtained for particle volume fraction of 6% at Reynolds number of 200. In the pulsating flow case, the combined effect of pulsation and inclusion of nanoparticles is not favorable for the augmentation of the stagnation point Nusselt number at Re = 200, φ=1%, 3% and at Re = 400, φ = 1%, 3% when compared to the steady case.
机译:在这项研究中,提出了一种带有纳米流体的脉动矩形射流的数值研究。这项工作的目的是从数值上研究各种参数的影响,例如脉动频率,雷诺数,纳米颗粒体积分数对流体流动和传热特性的影响。不稳定的Navier-Stokes和能量方程式是通过商业有限体积的代码求解的。在稳定情况下可以观察到,添加纳米颗粒会增加停滞点处的努塞尔数峰值和沿撞击板的空间平均努塞尔数。当雷诺数为200时,颗粒体积分数为6%时,传热增强高达18.8%。在脉动流情况下,脉动和纳米颗粒夹杂的综合作用不利于增大滞点Nusselt数。与稳定情况相比,Re = 200,φ= 1%,3%,在Re = 400,φ= 1%,3%。

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