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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation of the effect of cylindrical array structure on heat transfer performance during nucleate boiling
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Experimental investigation of the effect of cylindrical array structure on heat transfer performance during nucleate boiling

机译：圆柱形阵列结构对核心沸腾过程中传热性能影响的实验研究

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摘要

Using deionized water as the working fluid, a visualized pool boiling study was carried out on the surface of cylindrical pillar arrays of different sizes and the ordinary smooth surface under atmospheric pressure, and the boiling heat transfer curve and the change of heat transfer coefficient were studied. A high-speed camera is used to quantitatively measure the bubble dynamics, including bubble departure diameter and nucleation sites density. The results show that the onset of nucleate boiling temperature of all cylindrical pillar arrays has been significantly reduced, while the heat transfer coefficient is increased by 23.4%-163.4% compared to that of the smooth surface. The decrease of the pillar spacing helps to improve the performance of boiling heat transfer. The smaller gap optimizes the capillary flow of the liquid to a certain extent, thus facilitating the departure of bubbles, thereby inducing the working fluid to quickly replenish the dry area. The reduction of the diameter of the pillars is beneficial to improve the boiling heat transfer performance. More nucleation sites on the wall promote the bubbles to merge more quickly and reach the bubble departure diameter more easily, thus enhancing the evaporation of the micro-liquid layer and promoting the heat transfer. The correlation expressions as well as the upper and lower limits are obtained by fitting the change of heat transfer coefficient curve. Compared with the data in the literature, the S6 surface with the best performance shows obvious heat transfer advantages.
机译：使用去离子水作为工作流体，在圆柱形柱阵列的不同尺寸的表面和大气压力下的普通光滑表面的表面上进行了可视化的池沸腾研究，研究了沸腾的传热曲线和传热系数的变化。高速相机用于定量测量气泡动力学，包括气泡偏离直径和成核位置密度。结果表明，与光滑表面相比，所有圆柱形柱阵列的核心沸腾温度的发作已显着降低，而传热系数增加23.4％-163.4％。柱间距的减少有助于提高沸腾热传递的性能。较小的间隙优化了液体的毛细血管流动到一定程度，从而促进了气泡的偏离，从而诱导工作流体快速补充干燥区域。柱的直径的降低有利于提高沸腾的传热性能。墙壁上的更多成核地点促进气泡更快地合并并更容易地达到气泡脱离直径，从而增强微液体层的蒸发并促进传热。通过拟合传热系数曲线的变化来获得相关表达以及上限和下限。与文献中的数据相比，S6表面具有最佳性能显示出明显的传热优势。

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