The Influence of Surface Roughness on Nucleate Pool Boiling Heat Transfer
The Influence of Surface Roughness on Nucleate Pool Boiling Heat Transfer
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DOI：
10.1115/1.3220144
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发表时间：
2009-12
影响因子：
--
通讯作者：
B. Jones;John P. McHale;S. Garimella
中科院分区：
文献类型：
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作者：
B. Jones;John P. McHale;S. Garimella
在水和Fluorinert ™ FC-77（两种具有不同热性质和润湿特性的流体）中，在宽范围的粗糙度值下，实验探索了表面粗糙度对池沸腾传热的影响。测试表面的范围从抛光表面（Ra在0.027 m和0.038 m之间）到粗糙度Ra在1.08 m至10.0 m范围内的放电加工（EDM）表面。不同的趋势被观察到的传热系数相对于表面粗糙度之间的两种流体在同一组表面。对于FC-77，发现传热系数随着粗糙度的增加而不断增加。对于水，另一方面，EDM表面的中间粗糙度显示类似的传热系数高于抛光表面，而最粗糙的表面表现出最高的传热系数。与水相比，FC-77的表面粗糙度对传热系数的影响更大。对于FC-77，最粗糙的表面比抛光表面产生高210%的传热系数，而对于水，在同一组表面之间测量到更适度的100%增强。虽然结果突出了使用Ra表征核态池沸腾数据的不足，但观察到的粗糙度效应与使用h Ra在先前的几项研究中所做的一样。实验结果进行了比较，从几个广泛使用的相关性在文献中的预测。DOI：10.1115/1.3220144
The effect of surface roughness on pool boiling heat transfer is experimentally explored over a wide range of roughness values in water and Fluorinert ™ FC-77, two fluids with different thermal properties and wetting characteristics. The test surfaces ranged from a polished surface (Ra between 0.027 m and 0.038 m) to electrical discharge machined (EDM) surfaces with a roughness Ra ranging from 1.08 m to 10.0 m. Different trends were observed in the heat transfer coefficient with respect to the surface roughness between the two fluids on the same set of surfaces. For FC-77, the heat transfer coefficient was found to continually increase with increasing roughness. For water, on the other hand, EDM surfaces of intermediate roughness displayed similar heat transfer coefficients that were higher than for the polished surface, while the roughest surface showed the highest heat transfer coefficients. The heat transfer coefficients were more strongly influenced by surface roughness with FC-77 than with water. For FC-77, the roughest surface produced 210% higher heat transfer coefficients than the polished surface while for water, a more modest 100% enhancement was measured between the same set of surfaces. Although the results highlight the inadequacy of characterizing nucleate pool boiling data using Ra, the observed effect of roughness was correlated using h Ra as has been done in several prior studies. The experimental results were compared with predictions from several widely used correlations in the literature. DOI: 10.1115/1.3220144