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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Natural convection combined with thermal radiation in a square cavity filled with a viscoelastic fluid
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Natural convection combined with thermal radiation in a square cavity filled with a viscoelastic fluid

机译：自然对流和热辐射在充满粘弹性流体的方腔中

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摘要

Purpose - The purpose of this paper is to study natural convective heat transfer and viscoelastic fluid flow in a differentially heated square cavity under the effect of thermal radiation. Design/methodology/approach - The cavity filled with a viscoelastic fluid is heated uniformly from the left wall and cooled from the right side while insulated from horizontal walls. Governing partial differential equations formulated in non-dimensional stream function, vorticity and temperature with corresponding boundary conditions have been solved by finite difference method of second order accuracy. The effects of Rayleigh number iRa = le+3- le+5), radiation parameter {Rd = 0 - 10), Prandtl number (Pr = 1 - 30) and elastic number (£ = 0.0001 - 0.001) on flow patterns, temperature fields, average Nusselt number at hot vertical wall and rate of fluid flow have been studied. Findings - It has been found that a growth of elastic number leads to the heat transfer reduction and convective flow attenuation. The heat conduction is a dominating heat transfer mechanism for high values of radiation parameter. Originality/value - The originality of this work is to analyze heat transfer and fluid flow of a viscoelastic fluid inside a differentially heated cavity. The results would benefit scientists and engineers to become familiar with the flow and heat behavior of non-Newtonian fluids, and the way to predict the properties of this flow for possibility of using viscoelastic fluids in compact heat exchangers, electronic cooling systems, polymer engineering, etc.
机译：目的-本文的目的是研究在热辐射作用下，差热加热方腔中的自然对流传热和粘弹性流体流动。设计/方法/方法-充满粘弹性流体的空腔从左壁均匀加热，从右侧冷却，同时与水平壁绝缘。利用二阶精度的有限差分方法，解决了用无量纲流函数，涡旋和温度方程拟定的偏微分方程的控制问题。瑞利数iRa = le + 3- le + 5），辐射参数{Rd = 0-10），普朗特数（Pr = 1-30）和弹性数（£= 0.0001-0.001）对流型，温度的影响领域，研究了垂直热壁上的平均努塞尔数和流体流速。发现-已经发现，弹性数的增加会导致传热的减少和对流的衰减。对于高辐射参数值，热传导是主要的传热机制。独创性/价值-这项工作的独创性是分析差温加热腔内粘弹性流体的传热和流体流动。结果将有利于科学家和工程师熟悉非牛顿流体的流动和热行为，以及预测这种流动特性的方式，以便在紧凑型热交换器，电子冷却系统，聚合物工程，等等

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