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首页> 外文期刊>International Journal of Heat and Mass Transfer >Natural convection heat transfer in a nanofluid-filled trapezoidal enclosure
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Natural convection heat transfer in a nanofluid-filled trapezoidal enclosure

机译：纳米流体填充的梯形外壳中的自然对流传热

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摘要

Heat transfer enhancement utilizing nanofluids in a trapezoidal enclosure is investigated for various pertinent parameters. Transport equations are modelled by a stream-vorticity formulation and solved numerically by finite difference approach. The inclined sloping boundaries is treated by adopting staircase-like zigzag lines. Based upon the numerical predictions, the effects of Grashof number, inclination angle of the sloping wall, volume fraction of nanoparticles on flow and temperature patterns as well as the heat transfer rate within the enclosure are presented. Water-Cu and water-AI_2O_3 nanofluids were tested. We found that acute sloping wall and Cu nanoparticles with high concentration are effective to enhance the rate of heat transfer. We also developed a new correlation for the average Nusselt number as a function of the angle of the sloping wall, effective thermal conductivity and viscosity as well as Grashof number.
机译：对于各种相关参数，研究了利用梯形外壳中的纳米流体进行的传热增强。输运方程通过流涡公式化建模，并通过有限差分法进行数值求解。倾斜的倾斜边界采用阶梯状的锯齿形线处理。基于数值预测，提出了格拉索夫数，倾斜壁的倾斜角，纳米颗粒的体积分数对流动和温度模式以及外壳内的传热速率的影响。测试了水-铜和水-Al_2O_3纳米流体。我们发现，急性倾斜壁和高浓度的铜纳米颗粒可有效提高热传递速率。我们还针对倾斜壁的角度，有效导热率和粘度以及格拉斯霍夫数的函数，针对平均努塞尔数开发了一种新的相关性。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第3期|p.194-201|共8页
  • 作者

    H. Saleh; R. Roslan; I. Hashim;

  • 作者单位

    Centre for Modelling & Data Analysis, School of Mathematical Sciences. Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;

    Centre for Research in Applied Mathematics, Faculty of Science, Arts & Heritage, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Johor, Malaysia;

    Centre for Modelling & Data Analysis, School of Mathematical Sciences. Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;

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

    nanofluids; natural convection; trapezoidal enclosure;

    机译：纳米流体自然对流;梯形外壳;

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