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首页> 外文期刊>Journal of engineering thermophysics >Investigating the effects of nanoparticles mean diameter on laminar mixed convection of a nanofluid through an inclined tube with circumferentially nonuniform heat flux
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Investigating the effects of nanoparticles mean diameter on laminar mixed convection of a nanofluid through an inclined tube with circumferentially nonuniform heat flux

机译：用周向非均匀热通量研究纳米颗粒直径对纳米流体的层状流动对流的影响

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摘要

In this study, laminar mixed convection of a water-based nanofluid containing Al2O3 nanoparticles in an inclined copper tube, which is heated at the top half surface, is investigated numerically. A heat conduction mechanism through the tube wall was implemented. Three-dimensional equations using a two-phase mixture model were solved to investigate the hydrodynamic and thermal behaviors of the nanofluid over a wide range of nanoparticle volume fractions. To verify the model, the results were compared with previous works and a good agreement between the results was observed. The effect of nanoparticles diameter on the hydrodynamic and thermal parameters over a wide range of Grashof numbers is presented and discussed for a particle volume fraction and Reynolds number. It is shown that the diameter of nanoparticles affects the particle distribution in the cross section perpendicular to the tube axis, heat transfer coefficient, and shear stress.
机译：在本研究中，数值研究了倾斜铜管中含有Al2O3纳米颗粒的水基纳米流体在上半表面加热时的层流混合对流。通过管壁实现了热传导机制。采用两相混合模型求解三维方程组，研究了纳米流体在大范围内的流体力学和热行为。为了验证该模型，将结果与之前的工作进行了比较，结果之间有很好的一致性。在颗粒体积分数和雷诺数范围内，给出并讨论了纳米颗粒直径对流体力学和热学参数的影响。结果表明，纳米颗粒的直径影响颗粒在垂直于管轴的横截面上的分布、传热系数和剪切应力。

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