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首页> 外文期刊>Journal of thermal analysis and calorimetry >Finite element simulations for natural convective flow of nanofluid in a rectangular cavity having corrugated heated rods
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Finite element simulations for natural convective flow of nanofluid in a rectangular cavity having corrugated heated rods

机译：纳米流体在具有波纹加热棒中纳米流体自然对流流动的有限元模拟

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摘要

In this study, numerical simulations of natural convection in a partially heated rectangular cavity containing water-based copper oxide nanofluid (CuO-water) have been carried out. The flow field and heat transfer inside the cavity are influenced by two corrugated heated rods. The governing partial differential equations are transformed to dimensionless coupled nonlinear partial differential equations using some suitable variables. For the thermophysical properties of nanofluid, Koo and Kleinstreuer-Li model is implemented in the governing equation. Numerical solutions of the resulting system of equations are obtained utilizing finite element method. The simulations for flow field and thermal distribution are portrayed in terms of line graphs, streamlines and isotherms. The results are executed for various Rayleigh numbers (104 <= Ra <= 106), nanoparticle volume fractions (0.0 <=phi <= 0.2), amplitudes of the corrugated heated rods (0.05 <= Am <= 0.2) and wavelength numbers (0 <= n <= 20). Results depict that the thermal distribution and flow field are getting stronger because of increasing Ra and n. The impact of nanoparticle volume fraction is found to be useful in intensifying the heat transfer rate because of dominant convection. It is worth mentioning that with an increase in Amthe thermal distribution in the entire cavity is control by convection.
机译：在这项研究中，对含有水基氧化铜纳米流体（CuO-water）的部分加热矩形腔体中的自然对流进行了数值模拟。腔体内部的流场和传热受到两个波纹加热棒的影响。利用适当的变量将控制偏微分方程转化为无量纲耦合非线性偏微分方程。对于纳米流体的热物理性质，控制方程中采用了Koo和Kleinstreuer-Li模型。利用有限元方法获得了所得到的方程组的数值解。用线图、流线和等温线描述了流场和热分布的模拟。对各种瑞利数（104<=Ra<=106）、纳米颗粒体积分数（0.0<=phi<=0.2）、波纹加热棒的振幅（0.05<=Am<=0.2）和波长数（0<=n<=20）执行结果。结果表明，由于Ra和n的增加，热分布和流场变得更强。纳米颗粒体积分数的影响有助于强化主要对流的传热速率。值得一提的是，随着AMP的增加，整个空腔中的热分布由对流控制。

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