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Effects of two-phase nanofluid model and localized heat source/sink on natural convection in a square cavity with a solid circular cylinder

机译:两相纳米流体模型和局部热源/散热片对带有实心圆柱体的方腔中自然对流的影响

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In the present study, natural convection heat transfer of Al2O3-water nanofluid inside a square cavity with a solid circular cylinder is investigated numerically. For numerical computations, the finite element method is used by taking into consideration Buongiorno's two-phase model. Parts of the vertical surfaces of cavity are kept at constant temperature (left wall T-h and right wall T-c) while the other walls (horizontal walls and the remaining of the vertical walls) are taken as adiabatic. The effects of some pertinent parameters such as the Rayleigh number (10(3) = Ra = 10(6)), nanoparticle volume fraction (0 = phi = 0.04), thermal conductivity of the solid cylinder (k(w) = 0.28, 0.76, 1.95, 7 and 16), radius of solid cylinder (0.1 = R = 0.4), heat source/sink length (0.2 = D = 0.8), and the heat source/sink position (0.2 = B = 0.8) on the fluid flow and heat transfer characteristics are investigated. The obtained numerical results are depicted graphically and discussed in detail from the point of view of the streamlines, isotherms, nanoparticle volume fractions and the local and average Nusselt number Nu. It is indicated that the heat transfer is enhanced with an increase in the nanoparticle volume fraction for all studied Rayleigh numbers. Furthermore, the thermal conductivity, solid circular cylinder size, D and B parameters are the key factors to control and optimize the heat transfer inside the cavity that is partially heated and cooled. The proposed method is found to be in good agreement between previously published experimental and numerical results. (C) 2018 Elsevier B.V. All rights reserved.
机译:在本研究中,对具有固态圆柱的方腔内Al2O3-水纳米流体的自然对流传热进行了数值研究。对于数值计算,通过考虑Buongiorno的两相模型来使用有限元方法。腔的垂直表面的一部分保持恒温(左壁T-h和右壁T-c),而其他壁(水平壁和其余垂直壁)被视为绝热。一些相关参数的影响,例如瑞利数(10(3)<= Ra <= 10(6)),纳米颗粒体积分数(0 <= phi <= 0.04),实心圆柱的热导率(k(w )= 0.28、0.76、1.95、7和16),实心圆柱体的半径(0.1 <= R <= 0.4),热源/散热器长度(0.2 <= D <= 0.8)和热源/散热器位置( 0.2 <= B <= 0.8)对流体流动和传热特性进行了研究。从流线,等温线,纳米颗粒体积分数以及局部和平均努塞尔数Nu的角度,图形化地描述了获得的数值结果并进行了详细讨论。结果表明,对于所有研究的瑞利数,随着纳米颗粒体积分数的增加,传热也得到增强。此外,导热系数,实心圆柱体尺寸,D和B参数是控制和优化部分加热和冷却的腔体内传热的关键因素。发现所提出的方法与先前发表的实验结果和数值结果非常吻合。 (C)2018 Elsevier B.V.保留所有权利。

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