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首页> 外文会议>Advances in Electronic Packaging 2005 pt.A >FORCED CONVECTIVE HEAT TRANSFER FOR PARTIALLY-CONFINED COMPACT PPF HEAT SINKS WITH TOP-BYPASS EFFECT
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FORCED CONVECTIVE HEAT TRANSFER FOR PARTIALLY-CONFINED COMPACT PPF HEAT SINKS WITH TOP-BYPASS EFFECT

机译：具有顶部旁路效应的部分约束紧凑型PPF传热的强制对流换热

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摘要

A series of experimental investigations with a stringent measurement method on the study of the fluid flow and heat transfer for confined compact heat sinks in forced convection have been successfully conducted. From the results, the thermal capacity of the heat sink and the convective heat dissipation play the major roles for dominating the transient thermal behavior in the beginning of power-on transient period; while, the convective heat dissipation finally becomes the solely dominating term at the end of power-on transient period. The transient/steady-state local and average Nusselt numbers increase with increasing Grs, H/Hc ratio or Re. As compared with the steady-state average Nusselt number for non-compact heat sink (Fin-Al/Base-Al), the steady-state heat transfer enhancement for compact heat sinks (Fin-Al/Base-Al) is 185.74%. Furthermore, a new correlation of steady-state average Nusselt number in terms of relevant influencing parameters for confined compact PPF heat sinks in forced convection is proposed. As compared with two existing correlations of steady-state average Nusselt numbers for unconfined and confined non-compact PPF heat sinks, the heat transfer enhancements for the present confined compact PPF heat sinks of H/Hc =0.47 are 423.29% and 219.93%, respectively.
机译：已经成功进行了一系列严格的测量方法实验研究，以研究强制对流中的紧凑型散热器的流体流动和传热。从结果可以看出，散热器的热容量和对流散热在上电瞬态开始时支配瞬态热行为中起着主要作用。而对流散热最终成为上电过渡周期结束时的唯一控制项。瞬态/稳态局部和平均Nusselt数随Grs，H / Hc比或Re的增加而增加。与非紧凑型散热器（Fin-Al / Base-Al）的稳态平均Nusselt数相比，紧凑型散热器（Fin-Al / Base-Al）的稳态传热增强为185.74％。此外，提出了一种新的稳态平均努塞尔数在强迫对流条件下的紧凑型PPF散热器的相关影响参数的相关性。与无约束和约束非紧凑PPF散热器的稳态平均Nusselt数的两个现有相关性相比，当前H / Hc = 0.47的约束紧凑PPF散热器的传热增强分别为423.29％和219.93％ 。

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