The effect of turbulence parameters and support position on the heat transfer from spheres
The effect of turbulence parameters and support position on the heat transfer from spheres
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湍流参数和支撑位置对球体传热的影响
DOI：
10.1016/0017-9310(68)90194-4
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发表时间：
1968
影响因子：
5.2
通讯作者：
E. Eckert
中科院分区：
文献类型：
--
作者：
G. Raithby;E. Eckert
报告的测量结果显示了湍流强度、湍流规模和支撑位置对从球体到气流的平均传热的影响。雷诺数范围约为 3·6 × 103 至 5·2 × 104。在 4·6 至 18·3 m/s 的速度下，测量了三个网格下游的湍流强度和湍流分布规模（随后在网格后面进行传热测量）。传热测量表明，平均努塞尔数随着湍流强度的增加而增加，并且随着球体直径与湍流规模之比的增加（值至少为 5）。使用横流支撑获得的努塞尔数比使用后支撑获得的努塞尔数高出约 10%。给出了低湍流自由流的平均努塞尔数与雷诺数之间的方程。
Measurements are reported which show the influence of the turbulence intensity, the scale of turbulence, and the position of the support, on the average heat transfer from spheres to an air stream. The Reynolds number range was from about 3·6 × 103to 5·2 × 104. The turbulence intensity and the scale of turbulence distributions downstream from three grids, behind which the heat-transfer measurements were later made, were measured for velocities from 4·6 to 18·3 m/s. The heat-transfer measurements showed that the average Nusselt number increased with the turbulence intensity, and with the ratio of the sphere diameter to the scale of turbulence for values up to at least five. Nusselt numbers, obtained using a crossflow support, were found to be about 10 per cent higher than those obtained using a rear support. Equations relating the average Nusselt number to the Reynolds number, for a low-turbulence free stream, are given.