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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005); 20050717-22; San Francisco,CA(UA) >NATURAL CONVECTIVE HEAT TRANSFER FROM AN UNCONFINED OR A CONFINED HEATED SURFACE
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NATURAL CONVECTIVE HEAT TRANSFER FROM AN UNCONFINED OR A CONFINED HEATED SURFACE

机译：来自无限制或受限制加热表面的自然对流换热

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摘要

A series of experimental investigations with a stringent measurement method on the natural heat transfer from an unconfined or confined smooth and extended surface have been successfully conducted. From the results, the maximum transient-/steady-state local Nusselt number exists in the region near the edge of the heated smooth or extended surface, and the transient-/ steady-state local Nusselt number decreases along the distance from the surface edge toward the surface center. The transient/steady-state local and average Nusselt number increases with increasing Gr_s, H/W or H_(es)/W. The effects of Gr_s, H/W and H_(es)/W on the Nu_s/Nu_(s,o) distribution are not significant; and the Nu_s/Nu_(s,o) distribution can be expressed as a generalized bowl-shaped profile, which is independent of Gr_s, H/W and H_(es)/W. By the statistical sensitivity analysis of ANOVA F-test, the steady-state average Nusselt number for unconfined/confined smooth or extended surface is significantly affected by either one of Gr_s, H/W and H_(es)/W. Among them, Gr_s has the most significant effect. Four new correlations of steady-state average Nusselt number in terms of relevant influencing parameters for unconfined/ confined smooth or extended surfaces are proposed, respectively. Furthermore, two normalized steady-state average Nusselt numbers for confined smooth or extended surfaces are proposed, respectively. As compared with the steady-state average Nusselt numbers for unconfined/confined smooth surface, the steady-state heat transfer enhancement for unconfined/confined extended surface can be achieved between 93.99% and 254.65%.
机译：已经成功地进行了一系列严格的测量方法，对无限制或狭窄的光滑和延伸表面的自然热传递进行了一系列实验研究。根据结果​​，最大瞬态/稳态局部Nusselt数存在于加热的光滑或延伸表面边缘附近的区域中，并且瞬态/稳态局部Nusselt数沿从表面边缘到表面的距离减小表面中心。瞬态/稳态局部和平均努塞尔数随Gr_s，H / W或H_（es）/ W的增加而增加。 Gr_s，H / W和H_（es）/ W对Nu_s / Nu_（s，o）分布的影响不显着； Nu_s / Nu_（s，o）分布可以表示为广义碗形轮廓，与Gr_s，H / W和H_（es）/ W无关。通过ANOVA F检验的统计敏感性分析，Gr_s，H / W和H_（es）/ W之一会显着影响未限制/限制的光滑或扩展表面的稳态平均Nusselt数。其中，Gr_s的影响最大。提出了四种新的稳态平均努塞尔特数相关的无约束/受限光滑或扩展表面相关参数。此外，分别针对受限的光滑或扩展表面提出了两个归一化的稳态平均努塞尔数。与非受限/受限光滑表面的稳态平均Nusselt数相比，非受限/受限扩展表面的稳态传热可以达到93.99％至254.65％。

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