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Investigating Heat Transfer and Skin Friction Using Water-CuO Nanofluid between Eccentric Channels

机译：使用偏心通道之间的水 - CUO纳米流体来研究传热和皮肤摩擦

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摘要

The current paper presents the mixed convection of nanofluid flow between eccentric channels. The present research is the first simulation which studies the simultaneous effects of eccentricity and Richardson number on the nanofluid flow. Two different thermal boundary conditions are considered: case A (heat flux is applied on the inner channel) and case B (heat flux is employed on the outer channel). In this paper, convective heat transfer coefficient and skin friction coefficient are surveyed based on dimensionless eccentricity, nanopar-ticle concentration, boundary condition, and Richardson number. In case A and Richardson number of 0.1, the maximum and minimum convective heat transfer coefficient occur in concentricity and positive dimensionless eccentricity, respectively. Meanwhile, the highest and lowest skin friction coefficient on the inner channel happen, respectively, in concentricity and negative dimensionless eccentricity. Also, the convective heat transfer coefficient increases by the nanoparticle concentration increment from 0 to 0.04. Moreover, nanopar-ticle concentration does not affect the skin friction coefficient. In case B, convective heat transfer coefficient decreases by increasing the dimensionless eccentricity. Consequently, this article shows that applying heat flux on the channels, eccentricity and nanoparticle concentration are important parameters in the heat exchanger performance.
机译：目前纸张呈现偏心通道之间的纳米流体流动的混合对流。本研究是第一次模拟，研究偏心和理查森数对纳米流体流动的同时效果。考虑了两个不同的热边界条件：壳体A（在内部通道上施加热通量）和壳体B（在外部通道上采用热通量）。本文基于无量纲偏心，纳米麦克力浓度，边界条件和理查森数进行调查对流传热系数和皮肤摩擦系数。在A和Richardson数为0.1的情况下，分别以同心度和正无量纲的偏心发生的最大和最小对流传热系数。同时，内部通道上的最高和最低的肌肤摩擦系数分别以同心度和负无量纲偏心而发生。而且，对流传热系数通过0至0.04的纳米颗粒浓度增量增加。此外，纳米麦克酸浓度不会影响皮肤摩擦系数。在B的情况下，通过增加无量纲偏心度，对流传热系数减小。因此，本文表明，在通道上施加热量，偏心和纳米颗粒浓度是热交换器性能的重要参数。

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  • 来源
    《Heat Transfer Engineering》 |2020年第18期|1485-1498|共14页
  • 作者

    Arash Rezaei Gorjaei; Azadeh Shahidian;

  • 作者单位

    Department of Mechanical Engineering K. N. Toosi University of Technology Tehran Iran;

    Department of Mechanical Engineering K. N. Toosi University of Technology Tehran Iran;

  • 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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