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Lattice Boltzmann simulation of natural convection and heat transfer from multiple heated blocks

机译：格子Boltzmann仿真自然对流和来自多个加热块的热传递

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摘要

This study is aimed to investigate the natural convection heat transfer from discrete heat sources (similar to heated microchips) using Bhatnagar-Gross-Krook lattice Boltzmann method via graphics process unit computing. The simulation is carried out separately for three and six heated blocks model for different Rayleigh numbers and fixed Prandtl number, Pr = 0.71 (air). The uniformly heated blocks are placed at the bottom wall inside a rectangular enclosure. The enclosure is maintained by the cold temperature at its left and right walls. The top and bottom surface is maintained by adiabatic conditions apart from the regions where blocks are attached to the bottom wall. The numerical code is validated with the benchmark heat transfer problem of side-heated square cavity as well as with an experimental study for one discrete heat source. The rate of heat transfer is presented in terms of the local Nusselt and average Nusselt number for each block. It is found that the heat transfer rate becomes maximized in the leftmost and rightmost blocks due to the adjacent cold walls. It is found that the number of blocks and their positions play a substantial role in determining their collective performance on the heat transfer rate.
机译：本研究旨在通过图形工艺单元计算，使用Bhatnagar-Gross-Krook晶格Boltzmann方法来研究从离散热源（类似于加热的微芯片）的自然对流热传递。仿真分别用于三个和六个加热的块模型，用于不同的瑞利数和固定的Prandtl号，Pr = 0.71（空气）。将均匀加热的块放置在矩形外壳内的底壁。外壳由左右墙的寒冷温度保持。顶表面由绝热条件与块附着在底壁上的区域之外。用边加热方腔的基准传热问题验证了数值代码以及对一个离散热源的实验研究。以每种块的局部营养和平均营养号来呈现传热速率。结果发现，由于相邻的冷壁，传热速率在最左侧和最右侧的块中最大化。发现块的数量及其位置在确定传热速率上的集体性能方面发挥了重要作用。

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  • 来源
    《Heat transfer》 |2020年第4期|1877-1894|共18页
  • 作者

    K. M. Zamilur Rahim; Jamil Ahmed; Preetom Nag; Mamun Molla;

  • 作者单位

    Department of of Electrical & Computer Engineering North South University Dhaka Bangladesh;

    Department of of Electrical & Computer Engineering North South University Dhaka Bangladesh;

    Department of Mathematics & Physics North South University Dhaka Bangladesh Center for Applied Scientific Computing (CASC) North South University Dhaka Bangladesh;

    Department of Mathematics & Physics North South University Dhaka Bangladesh Center for Applied Scientific Computing (CASC) North South University Dhaka Bangladesh;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    GPU computing; heat transfer; heated blocks; lattice Boltzmann method; natural convection;

    机译：GPU计算;传播热量;加热块;格子Boltzmann方法;自然对流;

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