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首页> 外文期刊>International Journal of Heat and Mass Transfer >Influence of wall material on nucleate pool boiling of liquid nitrogen
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Influence of wall material on nucleate pool boiling of liquid nitrogen

机译：壁材料对液氮成核池沸腾的影响

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摘要

The wall material thermal conductivity k is one of the surface characteristics that influences the pool boiling heat transfer curve. The growth rate of vapor bubbles and their frequency are mechanisms affected by the thermal conductivity. But the wall material fc affects the nucleate boiling curve only in the case of a limited number of nucleation sites. Previous experiments in fact concluded that for a rough surface that has a larger number of vapor generating centers, the wall thermal conductivity does not significantly affect the nucleate pool boiling curve. In this paper, nucleate pool boiling curves of saturated nitrogen under ambient pressure are experimentally obtained on a horizontal flat surface and the effect of three different wall materials (copper, aluminum, stainless steel) is evaluated. The tested surfaces are mechanically polished to avoid any roughness effect. Hysteresis behavior has been observed for the copper and aluminum surfaces, while the results for stainless steel are difficult to assess. The critical heat flux is also analyzed and compared by taking into account the thermal effusivity of the different materials. Finally, experimental results are compared against the most common empirical correlations for nucleate pool boiling heat transfer.
机译：壁材料的导热系数k是影响池沸腾热传递曲线的表面特性之一。汽泡的增长率及其频率是受热导率影响的机理。但是壁材料fc仅在成核位置数量有限的情况下影响成核沸腾曲线。实际上，先前的实验得出的结论是，对于具有大量蒸汽发生中心的粗糙表面，壁的导热系数不会显着影响成核池的沸腾曲线。本文通过实验获得了水平压力下饱和氮在室温下的成核池沸腾曲线，并评估了三种不同壁材（铜，铝，不锈钢）的影响。对测试的表面进行机械抛光，以避免任何粗糙效果。已经观察到铜和铝表面的磁滞行为，而不锈钢的结果难以评估。还通过考虑不同材料的热发射率来分析和比较临界热通量。最后，将实验结果与核池沸腾传热的最常见经验相关性进行比较。

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