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首页> 外文期刊>Journal of Heat Transfer >A Numerical Study of Flow and Heat Transfer Between Two Rotating Spheres With Time-Dependent Angular Velocities
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A Numerical Study of Flow and Heat Transfer Between Two Rotating Spheres With Time-Dependent Angular Velocities

机译：角速度随时间变化的两个旋转球之间的流动和传热的数值研究

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摘要

The transient motion and the heat transfer of a viscous incompressible fluid contained between two vertically eccentric spheres maintained at different temperatures and rotating about a common axis with different angular velocities are numerically considered when the angular velocities are arbitrary functions of time. The resulting flow pattern, temperature distribution, and heat transfer characteristics are presented for the various cases including exponential and sinusoidal angular velocities. Long delays in heat transfer of large portions of the fluid in the annulus are observed because of the angular velocities of the corresponding spheres. As the eccentricity increases and the gap between the spheres decreases, the Coriolis forces and convection heat transfer effect in the narrower portion increase. Special results for concentric spheres are obtained by letting eccentricity tends to zero.
机译：当角速度是时间的任意函数时，在数值上考虑了包含在两个保持不同温度并围绕共同轴以不同角速度旋转的垂直偏心球之间的粘性不可压缩流体的瞬态运动和热传递。在各种情况下，包括指数和正弦角速度，都给出了所得的流型，温度分布和传热特性。由于相应球体的角速度，在环空中的大部分流体的传热都出现了长时间延迟。随着偏心率的增加和球体之间的间隙的减小，在较窄部分中的科里奥利力和对流传热效果会增加。通过使偏心率趋于零，可以获得同心球的特殊结果。

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