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首页> 外文期刊>Journal of Heat Transfer >Convective Motion and Heat Transfer in a Slowly Rotating Fluid Quasi-Sphere With Uniform Heat Source and Axial Gravity
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Convective Motion and Heat Transfer in a Slowly Rotating Fluid Quasi-Sphere With Uniform Heat Source and Axial Gravity

机译：具有均匀热源和轴向重力的慢旋转流体准球体内的对流运动和热传递

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摘要

The laminar natural convection of a rotating fluid quasi-sphere in the presence of an axial gravity field and uniform heat source is presented. The influence of the Rayleigh number Ra and the Taylor number Ta on the flow pattern and heat transfer rate from the fluid quasi-sphere is discussed. The governing nonsteady, three-dimensional Navier-Stokes equations for an incompressible fluid, formulated in a Cartesian coordinate system, have been numerically solved by using the h/p spectral element method. It is shown that for a given Ta number, as the Ra number is increased, the heat transfer on the northern hemisphere is enhanced whereas the average Nusselt number on the southern hemisphere is reduced. On the other hand for a given Ra number, as the Ta number is increased, the heat transfer is a function of the convective motion intensity. It has been found that for low and high Ra numbers the heat transfer rate slightly depends on the rotation rate. However at intermediate Ra numbers, the net effect of an increased rotation rate is a reduction of the heat transfer through the wall, hence an increase of the maximum temperature of the fluid sphere is observed. We show that the net effect of the Coriolis force is to damp the convective motion and to allow a redistribution of the vorticity field.
机译：提出了在存在轴向重力场和均匀热源的情况下旋转流体准球的层流自然对流。讨论了瑞利数Ra和泰勒数Ta对流体准球面的流型和传热速率的影响。通过使用h / p谱元法，对在笛卡尔坐标系中公式化的不可压缩流体的非稳态三维Navier-Stokes方程进行了数值求解。结果表明，对于给定的Ta数，随着Ra数的增加，北半球的传热增强，而南半球的平均Nusselt数减小。另一方面，对于给定的Ra数，随着Ta数的增加，传热是对流运动强度的函数。已经发现，对于低Ra数和高Ra数，传热速率略微取决于旋转速率。但是，在Ra数为中间值时，转速增加的净效果是减少了通过壁的传热，因此观察到了流体球体最高温度的增加。我们表明，科里奥利力的净效应是减弱对流运动并允许涡度场重新分布。

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  • 来源
    《Journal of Heat Transfer》 |2013年第4期|042501.1-042501.10|共10页
  • 作者

    Gerardo Anguiano-Orozco; Ruben Avila; Syed Shoaib Raza;

  • 作者单位

    Facultad de Ciencias, UAEM, Av. Instituto Literario 100,50000 Toluca, Mexico Depto. de Fisica, Instituto Nacional de Investigaciones Nucleares,Apdo. Postal 18-1027,Mexico D.F.;

    Departamento de Termofluidos,Facultad de Ingenieria,Universidad Nacional Autonoma de Mexico,C.P. 04510,Mexico D.F.;

    Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad 45650, Pakistan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nonsteady natural convection; fluid sphere; axial gravity;

    机译：非稳态自然对流;流体球轴向重力;

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