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首页> 外文期刊>Energy Conversion & Management >Nucleate boiling of FC-72 and HFE-7100 on porous graphite at different orientations and liquid subcooling
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Nucleate boiling of FC-72 and HFE-7100 on porous graphite at different orientations and liquid subcooling

机译：FC-72和HFE-7100在多孔石墨上以不同方向成核沸腾和液体过冷

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摘要

FC-72 and HFE-7100 dielectric liquids are favored for immersion cooling applications of computer chips. This paper reports the results of series of experiments that systematically investigated nucleate boiling of both FC-72 and HFE-710 on a plain porous graphite surface measuring 10 × 10 mm. The obtained values of the nucleate boiling heat transfer coefficient and critical heat flux (CHF), at different surface orientations, 0° (upward facing) to 180° and liquid subcooling up to 30 K. are compared. In addition to the absence of temperature excursions prior to boiling incipience, the CHF increases linearly with increased liquid subcooling but at a rate that is ~10% higher for HFE-7100 than that for FC-72. The CHF for HFE-7100 is typically 10% to 15% higher than that for FC-72, however, the maximum nucleate boiling heat transfer coefficient, occurring at or near the end of the fully developed nucleate boiling region, is ~57% higher for FC-72 than that for HFE-7100 and increases also linearly with increased liquid subcooling. The CHF correlation developed accounts for the effects of surface characteristics (smooth, porous, or micro-porous), liquid properties and subcooling, and surface inclination and fits present and reported values by other investigators to within ±10%.
机译：FC-72和HFE-7100介电液体特别适合计算机芯片的浸入冷却应用。本文报告了一系列实验的结果，这些实验系统地研究了FC-72和HFE-710在10×10 mm的普通多孔石墨表面上的成核沸腾。比较了在不同的表面方向（0°（朝上）至180°）和液体过冷至30 K.时所获得的成核沸腾传热系数和临界热通量（CHF）的值。除了在沸腾开始之前没有温度偏移外，CHF随液体过冷度的增加而线性增加，但HFE-7100的速率比FC-72高约10％。 HFE-7100的CHF通常比FC-72的CHF高10％至15％，但是，在完全发达的核沸腾区域的末端或附近出现的最大核沸腾传热系数高约57％。 FC-72的使用率比HFE-7100的使用率高，并且随着液体过冷度的增加而线性增加。开发的CHF相关性考虑了表面特性（光滑，多孔或微孔），液体特性和过冷度以及表面倾斜度的影响，并且其他研究者提供的当前值和报告值均在±10％以内。

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