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Numerical Studies on Natural Convection in a Trapezoidal Enclosure With Discrete Heating

机译：离散加热梯形壳体自然对流的数值研究

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摘要

A steady state laminar natural convection flow in a trapezoidal enclosure with discretely heated bottom wall, adiabatic top wall, and constant temperature cold inclined walls is performed. The finite volume based commercial code "ANSYS-FLUENT" is used to investigate the influence of discrete heating on natural convection flows in a trapezoidal cavity. The numerical solution of the problem covers various Rayleigh numbers ranging from 10~3 to 10~6, non-dimensional heating length ranging from 0.2 to 0.8 and Prandtl number is 0.7. The performance of the present numerical approach is represented in the form of streamfunction, temperature profile and Nusselt number. Heat transfer increases with increase of Rayleigh numbers at the corners of the cavity for same heating length from center of the bottom wall. However, the heat transfer rate is less and almost constant for the Rayleigh numbers considered. It is found that the average Nusselt number monotonically increases with increase of Rayleigh number and length of heat source. The variation of local and average Nusselt numbers is more significant for larger length of heating than smaller one. The heat transfer correlations useful for practical design problems have been predicted.
机译：在具有离散加热的底壁，绝热顶壁和恒温冷倾斜壁的梯形外壳中执行稳态层流自然对流。基于有限体积的商业代码“ ANSYS-FLUENT”用于研究离散加热对梯形腔中自然对流的影响。该问题的数值解决方案涵盖了10至3至10至6范围内的各种瑞利数，0.2至0.8范围内的无量纲加热长度以及普朗特数为0.7。本数值方法的性能以流函数，温度曲线和努塞尔数的形式表示。对于距离底壁中心相同的加热长度，传热随着腔角处瑞利数的增加而增加。但是，对于所考虑的瑞利数，传热速率较小且几乎恒定。发现平均努塞尔数随瑞利数和热源长度的增加而单调增加。对于较长的加热时间，局部和平均Nusselt数的变化比较小的加热时间更显着。已经预测了对实际设计问题有用的热传递相关性。

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  • 来源
    《Heat Transfer Engineering》 |2020年第10期|595-606|共12页
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  • 作者单位

    Department of Mechanical Engineering Sri Krishna Institute of Technology Bengaluru Karnataka India;

    Department of Mechanical Engineering Global Academy of Technology Bengaluru Karnataka India;

    Department of Mechanical Engineering Bangalore Institute of Technology Bengaluru Karnataka India;

    Department of Mechanical Engineering PES University Bengaluru Karnataka India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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