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首页> 外文期刊>International Journal of Heat and Mass Transfer >Bubble dynamics and nucleate pool boiling heat transfer on microporous copper surfaces
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Bubble dynamics and nucleate pool boiling heat transfer on microporous copper surfaces

机译：微孔铜表面上的气泡动力学和成核池沸腾传热

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摘要

Nucleate pool boiling experiments were performed on microporous copper surfaces and plain surfaces using saturated HFE-7100 as the working fluid. Quantitative measurements of the bubble dynamics, such as the nucleation site density, bubble diameter at departure, and bubble departure frequency, were obtained using high-speed visualization. The microporous surfaces, with coating thicknesses in the range of 100-700 μm, porosity of 55-60%, and cavity sizes in the range of 0.5-5 μm, showed a significantly lower boiling incipience temperature, which enhanced the heat transfer coefficient by 50-270% and enhanced the critical heat fluxes by 33-60% when compared to the plain surface. At low heat flux levels, the surface with a thicker microporous coating showed better performance than the thinner one. However, the thinner microporous coating resulted in higher critical heat flux than the thicker surface. The site density, departure diameter, and departure frequency were compared against the predictions using various correlations from the literature. Based on a heat flux partition model, using the measured values of the active site density and bubble departure diameter and frequency, and neglecting the single-phase heat transfer effects of bubble coalescence, the individual modes of heat transfer (evaporative, quenching, and convective) were computed. Reasonably good agreement between the partition model results and the experimental data was obtained. On the plain surfaces, the evaporative and quenching components were approximately equal. On the microporous surfaces, the evaporative component was found to be significantly higher.
机译：使用饱和的HFE-7100作为工作流体，在微孔铜表面和平坦表面上进行了核池沸腾实验。气泡动力学的定量测量，例如成核点密度，离开时的气泡直径和气泡离开频率，是使用高速可视化获得的。微孔表面的涂层厚度在100-700μm的范围内，孔隙率在55-60％的范围内，腔尺寸在0.5-5μm的范围内，显着降低了沸腾开始温度，从而提高了传热系数。与普通表面相比，可提高50-270％的临界热通量，并使临界热通量提高33-60％。在较低的热通量水平下，微孔涂层较厚的表面表现出比较薄的表面更好的性能。然而，较薄的微孔涂层比较厚的表面产生更高的临界热通量。使用文献中的各种相关性，将站点密度，偏离直径和偏离频率与预测值进行了比较。基于热通量分配模型，使用活动位置密度和气泡离开直径和频率的测量值，而忽略了气泡聚结的单相传热效果，忽略了各个传热模式（蒸发，淬灭和对流） ）进行了计算。分区模型结果与实验数据基本吻合良好。在平整表面上，蒸发和淬火成分大致相等。在微孔表面上，发现蒸发成分明显更高。

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