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Accuracy enhancement of thermal dispersion model in prediction of convective heat transfer for nanofluids considering the effects of particle migration

机译:考虑粒子迁移影响的纳米流体对流换热预测中的热分散模型精度提高

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摘要

A thermal dispersion model is utilized for simulation of convective heat transfer of water-TiO2 nanofluid for laminar flow in circular tube. Concentration distribution at cross section of the tube was obtained considering the effects of particle migration, and this concentration distribution was applied in the numerical solution. Numerical solution was done at Reynolds numbers of 500 to 2000 and mean concentrations of 0.5 to 3%. Meanwhile, an experimental study was conducted to investigate the accuracy of the results obtained from the numerical solution. Non-uniformity of the concentration distribution increases with raising mean concentration and Reynolds number. Thereby, for mean concentration of 3%, at Reynolds numbers of 500 and 2000, the concentration from wall to center of the tube increases 2.6 and 30.9%, respectively. In the dispersion model, application of non-uniform concentration distribution improves the accuracy in prediction of the convective heat transfer coefficient in comparison with applying uniform concentration.
机译:利用热扩散模型模拟了水-TiO2纳米流体对流在圆管中的对流换热。考虑颗粒迁移的影响,获得了管横截面的浓度分布,并将该浓度分布应用于数值解。在雷诺数为500至2000且平均浓度为0.5至3%的情况下进行了数值求解。同时,进行了一项实验研究,以研究从数值解获得的结果的准确性。浓度分布的不均匀性随平均浓度和雷诺数的增加而增加。因此,对于3%的平均浓度,在雷诺数为500和2000时,从管壁到中心的浓度分别增加2.6和30.9%。在弥散模型中,与应用均匀浓度相比,应用非均匀浓度分布可以提高对流传热系数预测的准确性。

著录项

  • 来源
    《Korean Journal of Chemical Engineering》 |2013年第8期|1552-1558|共7页
  • 作者单位

    Department of Energy Kermanshah University of Technology">(187);

    CFD Lab CAE Center School of Mechanical Engineering Iran University of Science Technology">(287);

    CFD Lab CAE Center School of Mechanical Engineering Iran University of Science Technology">(287);

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 00:01:29

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