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首页> 外文期刊>Heat Transfer Engineering >The Effect of Alumina-Water Nanofluid on Natural Convection Heat Transfer Inside Vertical Circular Enclosures Heated from Above
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The Effect of Alumina-Water Nanofluid on Natural Convection Heat Transfer Inside Vertical Circular Enclosures Heated from Above

机译：氧化铝-水纳米流体对从上方加热的垂直圆形外壳内部自然对流传热的影响

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摘要

Experimental investigation on natural convection heat transfer is carried out inside vertical circular enclosures filled with Al_2O_3-water nanofluid with different concentrations; 0.0%, 0.85% (0.21%), 1.98 (0.51%), and 2.95% (0.75%) by mass (volume). Two enclosures are used with 0.20 m inside diameter and with two different aspect ratios. The top surface of the enclosure is heated using a constant-heat-flux flexible foil heater while the bottom surface is subject to cooling using an ambient air stream. Various heat fluxes are used to generate heat transfer through the nanofluid. The average Nusselt number is obtained for each enclosure and correlated with the modified Rayleigh number using the concentration ratio as a parameter. A general correlation for the average Nusselt number with the modified Rayleigh number is obtained using the volume fraction and the aspect ratio as parameters to cover both enclosures. The results show that the Nusselt number for the alumina-water nanofluid is less than that of the base fluid. This means that using the alumina-water nanofluids adversely affects the heat transfer coefficient compared to using pure water. It is also found that the degree of deterioration depends on the concentration ratio as well as the aspect ratio of the enclosure.
机译：在装有不同浓度的Al_2O_3-水纳米流体的垂直圆形外壳内进行自然对流换热的实验研究；质量（体积）为0.0％，0.85％（0.21％），1.98（0.51％）和2.95％（0.75％）。使用两个内径为0.20 m且具有两个不同纵横比的外壳。外壳的顶面使用恒定热通量的柔性箔加热器加热，而底面则使用环境气流进行冷却。各种热通量用于产生通过纳米流体的热传递。获得每个封闭空间的平均努塞尔数，并使用浓度比作为参数与修正的瑞利数相关。使用体积分数和纵横比作为覆盖两个外壳的参数，可以获得平均努塞尔数与修改后的瑞利数的一般相关性。结果表明，氧化铝-水纳米流体的努塞尔数小于基础流体的努塞尔数。这意味着与使用纯水相比，使用氧化铝-水纳米流体会不利地影响传热系数。还发现劣化程度取决于外壳的浓度比以及纵横比。

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  • 来源
    《Heat Transfer Engineering》 |2013年第15期|1289-1299|共11页
  • 作者

    MOHAMED ALI; OBIDA ZEITOUN; SALEM ALMOTAIRI; HANY AL-ANSARY;

  • 作者单位

    Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia;

    Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia;

    Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia;

    Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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