NUMERICAL-CALCULATION OF CONVECTIVE HEAT-TRANSFER BETWEEN ROTATING COAXIAL CYLINDERS WITH PERIODICALLY EMBEDDED CAVITIES
NUMERICAL-CALCULATION OF CONVECTIVE HEAT-TRANSFER BETWEEN ROTATING COAXIAL CYLINDERS WITH PERIODICALLY EMBEDDED CAVITIES
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DOI：
10.1115/1.2911322
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发表时间：
1992-08-01
影响因子：
--
通讯作者：
GREIF, R
中科院分区：
文献类型：
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作者：
HAYASE, T;HUMPHREY, JAC;GREIF, R
对同轴圆柱间的流动与换热进行了数值模拟研究。特别令人感兴趣的是，其中任何一个圆柱体具有轴向开槽的表面，从而导致在其中嵌入12个周向周期性空腔。圆柱体的端部由平坦的不可渗透壁限定，该壁固定到外圆柱体上或与内圆柱体一起旋转。这种几何形状在电动机中很常见，其中对热物理现象的更好理解对于分析和设计至关重要。离散传输方程求解二维和三维，稳定，恒定的性能层流使用二阶精确的有限体积方案的范围内的SIMPLER为基础的迭代方法。二维计算揭示了剪切诱导的空腔内的再循环流动。对于雷诺数的超临界值，三维计算显示了空腔中的流动如何与环形空间中的泰勒涡相互作用以增强传热。相对于光滑表面的同轴圆柱体，对于本研究的条件，动量和热量的传输在嵌入在内圆柱体中的空腔的情况下提高了1.2倍，在嵌入外圆柱体中的空腔的情况下提高了1.1倍。
A numerical study has been performed for the flow and heat transfer in the space between a pair of coaxial cylinders with the outer one fixed and the inner one rotating. Of special interest is the case where either one of the cylinders has an axially grooved surface resulting in twelve circumferentially periodic cavities embedded in it. The ends of the cylinder are bounded by flat impermeable walls that are either fixed to the outer cylinder or rotate with the inner one. Such a geometry is common in electric motors where an improved understanding of thermophysical phenomena is essential for analysis and design. Discretized transport equations are solved for two-dimensional and three-dimensional, steady, constant property laminar flow using a second-order accurate finite volume scheme within the context of a SIMPLER-based iterative methodology. The two-dimensional calculations reveal a shear-induced recirculating flow in the cavities. For supercritical values of the Reynolds number, the three-dimensional calculations show how the flow in a cavity interacts with Taylor vortices in the annular space to enhance heat transfer. Relative to coaxial cylinders with smooth surfaces, for the conditions of this study the transport of momentum and heat is raised by a factor of 1.2 in the case of cavities embedded in the inner cylinder and by a factor of 1.1 in the case of cavities embedded in the outer cylinder.