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首页> 外文期刊>Heat Transfer Engineering >Varying Heating Effect on Mixed Convection of Nanofluids in a Vented Horizontal Cavity with Injection or Suction
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Varying Heating Effect on Mixed Convection of Nanofluids in a Vented Horizontal Cavity with Injection or Suction

机译：喷射或抽吸对水平通气腔中纳米流体混合对流的不同加热效应

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摘要

The problem of mixed convection heat transfer inside a horizontal vented enclosure through the lower and upper parts, respectively, of its left and right vertical walls is studied numerically using Al2O3-water nanofluid as working fluid. The bottom wall is subjected to a linearly varying (increasing or decreasing) heating temperature profiles, while the other boundaries are considered thermally insulated. The fresh fluid is admitted from the bottom part of the left vertical wall by injection or by the suction imposed on the opening of the right vertical wall. Based on numerical predictions, the conjugate effect of the Reynolds number and the nanoparticle concentration on fluid flow and heat transfer characteristics is studied. The obtained results demonstrate clearly the positive role of the nanoparticles addition on the improvement of the heat transfer rate and the mean temperature within the cavity. In addition, the flow structure and the temperature distribution inside the cavity are seen to be very sensitive to the variations of the Reynolds number, the imposed external flow mode, and the heating type. Results presented show that, in general, the decreasing heating mode is more favorable to the heat transfer in comparison with the case of the increasing heating mode. The cooling efficiency is found to be more pronounced by the injection/suction mode by applying the increasing/decreasing heating type.
机译：以Al2O3-水纳米流体为工作流体，对水平排风罩内部分别通过左右垂直壁的下部和上部的水平对流换热问题进行了数值研究。底壁的加热温度曲线呈线性变化（递增或递减），而其他边界被认为是隔热的。通过注入或通过施加在右垂直壁的开口上的抽吸，使新鲜流体从左垂直壁的底部进入。基于数值预测，研究了雷诺数和纳米粒子浓度对流体流动和传热特性的共轭效应。所获得的结果清楚地证明了添加纳米颗粒对改善热传递速率和腔内平均温度的积极作用。另外，腔体内的流动结构和温度分布对雷诺数，施加的外部流动模式和加热类型的变化非常敏感。给出的结果表明，一般而言，与增加加热方式相比，减少加热方式更有利于传热。通过采用增加/减少加热类型，通过喷射/抽吸模式发现冷却效率更加显着。

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  • 来源
    《Heat Transfer Engineering》 |2019年第12期|941-958|共18页
  • 作者

    Arroub Ismail; Bahlaoui Ahmed; Raji Abdelghani; Hasnaoui Mohammed; Naimi Mohamed;

  • 作者单位

    Sultan Moulay Slimane Univ, Interdisciplinary Lab Res Sci & Technol LIRST, Polydisciplinary Fac, Beni Mellal, Morocco;

    Sultan Moulay Slimane Univ, Interdisciplinary Lab Res Sci & Technol LIRST, Polydisciplinary Fac, Beni Mellal, Morocco;

    Sultan Moulay Slimane Univ, Lab Flows & Transfers Modelling LAMET, Fac Sci & Tech, Beni Mellal, Morocco;

    Cadi Ayyad Univ, Lab Fluid Mech & Energet LMFE, Fac Sci Semlalia, Marrakech, Morocco;

    Sultan Moulay Slimane Univ, Lab Flows & Transfers Modelling LAMET, Fac Sci & Tech, Beni Mellal, Morocco;

  • 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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