Natural Convection of Non-Newtonian Fluids in a Square Cavity with a Localized Heat Source
Natural Convection of Non-Newtonian Fluids in a Square Cavity with a Localized Heat Source
复制标题
具有局部热源的方腔内非牛顿流体的自然对流
DOI：
10.5545/sv-jme.2015.3218
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发表时间：
2016
影响因子：
1.7
通讯作者：
A. Raisi
中科院分区：
文献类型：
--
作者：
A. Raisi
本文研究了置于非牛顿幂律流体空腔底部的热源的自然对流冷却。热源产生均匀的热流。空腔底壁的其余部分是绝缘的，垂直壁和顶壁保持在低温下。采用基于控制体公式和SIMPLE算法的数值有限差分方法求解了幂律流体流动的控制方程。研究了瑞利数、幂指数、热源长度和热源位置等相关参数对空腔热性能的影响。结果表明，随着瑞利数的增加，尤其是当n<；1时，腔体的热性能得到改善。此外，使用非牛顿剪切稀释液，特别是在较高的瑞利数时，可以改善热源的冷却性能。结果还表明，热源的长度和位置对腔体的热性能有很大的影响，这取决于瑞利数和幂指数。
This study investigates the natural convection cooling of a heat source placed on the bottom of a cavity filled with non-Newtonian power-law fluids. The heat source produces a uniform heat flux. The remaining parts of the bottom wall of the cavity are insulated, and the vertical, and top walls are kept at a low temperature. The governing equations for the power-law fluid flow are solved with the numerical finite difference method based on the control volume formulation and SIMPLE algorithm. The study investigates the effects of relevant parameters such as the Rayleigh number, the power-law index and the heat source length and heat source location on the thermal performance of the cavity. The results show that as the Rayleigh number increases, particularly when n<1, the thermal performance of the cavity is improved. Furthermore, using non-Newtonian shear thinning fluids, especially at higher Rayleigh numbers, improves the cooling performance of the heat source. The results also show that, depending on the Rayleigh number and the power-law index, the length and position of the heat source have significant effects on the thermal performance of the cavity.