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首页> 外文期刊>Journal of Heat Transfer >Heater Size and Gravity Based Pool Boiling Regime Map:Transition Criteria Between Buoyancy and Surface Tension Dominated Boiling
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Heater Size and Gravity Based Pool Boiling Regime Map:Transition Criteria Between Buoyancy and Surface Tension Dominated Boiling

机译:基于加热器尺寸和重力的池沸腾状态图:浮力和表面张力主导的沸腾之间的转换标准

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摘要

A pool boiling regime map demarcating the boundary between the surface tension and buoyancy dominated boiling regimes is developed based on heater size and gravity. For large heaters and/or high gravity conditions, boiling is dominated by buoyancy, and the ebullition cycle dominates the contribution to heat transfer. As the gravity level and/or heater size is decreased, surface tension forces become increasingly dominant, and a decrease in heat transfer is observed. The ratio of the heater size L_h, (length of a side for a square heater) to the capillary length L_c is found to be a suitable parameter to define the transition criterion between these regimes. Based on the data obtained using FC-72 and pentane, the threshold value of L_h/L_c above which pool boiling is buoyancy dominated was found to be about 2.1. This transition criterion was found to be the same for gravity levels between ~0g-1.7g and liquid subcoolings between 6.6℃ and 26.6℃.
机译:根据加热器的尺寸和重力,绘制了划定表面张力与浮力主导的沸腾状态之间界限的水池沸腾状态图。对于大型加热器和/或高重力条件,沸腾主要由浮力决定,而沸腾循环主导着热传递。随着重力水平和/或加热器尺寸的减小,表面张力变得越来越占优势,并且观察到热传递减小。发现加热器尺寸L_h(方形加热器的边的长度)与毛细管长度L_c之比是确定这些状态之间转换标准的合适参数。基于使用FC-72和戊烷获得的数据,发现L_h / L_c的阈值约为2.1,在该阈值以上池沸腾为浮力主导。对于约0g至1.7g的重力水平和6.6℃至26.6℃的液体过冷度,该过渡标准是相同的。

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