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Experimental and Analytical Study on the Influence of Saturation Pressure and Surface Roughness on Pool Boiling CHF of HFE-7100
International Journal of Chemical Engineering ( IF 2.7 ) Pub Date : 2022-06-29 , DOI: 10.1155/2022/4875208
Xiaoguang Fan, Shiya Gu, Jingsheng Lei, Guihang Luo, Fanbin Meng, Liyan Wu, Shiyan Gu

Critical heat flux (CHF) determines the safety and application of pool boiling heat transfer in many industrial fields. The influence of saturation pressure and surface roughness on saturated pool boiling CHF in hydrofluoroether HFE-7100 was experimentally studied in this investigation. Visualization and heat transfer measurements were conducted at the critical and transition boiling state, and further, the accuracy of CHF prediction models and enhancement mechanism had been analyzed. The polished boiling surfaces had various surface roughness values ranging from 0.019 to 0.587 μm and their contact angles varied from 7° to 10°, while the experimental saturation pressure changed from 0.7 to 2.0 bar. The visual images showed that the pool boiling phenomenon at a critical state was composed of different-sized bubbles, vapor column, and large mushroom vapor, whereas the unsteady blanket of vapor continually injected bubbles at a transition state. The saturation pressure and surface roughness had an obvious improvement on pool boiling CHF, which might be ascribed to the effects of bubble momentum owing to evaporation, distribution and recovery period of a heat transfer boundary layer, capillary action of the working liquid, as well as ratio of vapor jets’ area. Compared with the well-known correlations reported in the literature, CHF correlation of Bailey et al. (2006) predicted the current results more accurately. To further improve the prediction accuracy, a new empirical correlation for CHF dimensionless K considering the effects of saturation pressure and surface roughness was developed, and the predicted values were in better agreement with the experimental data.

中文翻译:

饱和压力和表面粗糙度对HFE-7100池沸腾CHF影响的实验与分析研究

临界热通量(CHF)决定了池沸腾传热在许多工业领域的安全性和应用。本研究通过实验研究了饱和压力和表面粗糙度对氢氟醚 HFE-7100 中饱和池沸腾 CHF 的影响。在临界和过渡沸腾状态下进行可视化和传热测量,并进一步分析了 CHF 预测模型的准确性和增强机制。抛光沸腾表面具有从 0.019 到 0.587  μ的各种表面粗糙度值m 和它们的接触角从 7° 变化到 10°,而实验饱和压力从 0.7 变化到 2.0 bar。视觉图像显示,临界状态的池沸腾现象由大小不一的气泡、蒸气柱和大蘑菇蒸气组成,而不稳定的蒸气层在过渡状态下不断注入气泡。饱和压力和表面粗糙度对水池沸腾 CHF 有明显改善,这可能是由于传热边界层的蒸发、分布和恢复期、工作液体的毛细作用以及气泡动量的影响。蒸气射流面积比。与文献报道的众所周知的相关性相比,Bailey 等人的 CHF 相关性。(2006) 更准确地预测了当前的结果。考虑了饱和压力和表面粗糙度的影响,得出了K值,预测值与实验数据吻合较好。
更新日期:2022-06-29
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