Effects of hydrophobic-spot periphery and subcooling on nucleate pool boiling from a mixed-wettability surface
Effects of hydrophobic-spot periphery and subcooling on nucleate pool boiling from a mixed-wettability surface
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DOI：
10.1299/jtst.8.294
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发表时间：
2013-08
影响因子：
1.2
通讯作者：
B. Suroto;M. Tashiro;Sana Hirabayashi;S. Hidaka;M. Kohno;Y. Takata
中科院分区：
文献类型：
--
作者：
B. Suroto;M. Tashiro;Sana Hirabayashi;S. Hidaka;M. Kohno;Y. Takata
在中等热流密度下，研究了过冷度和疏水斑周边长度对有、无聚四氟乙烯（PTFE）疏水斑的TiO 2涂层表面池核沸腾换热的影响。实验在0-20 K的过冷度范围内进行，传热块为镀有TiO 2的铜块，其上带有不同直径的PTFE疏水圆斑，PTFE总面积不变。利用高速摄像机观察了气泡的成核和行为。结果表明，在整体工况下，PTFE疏水圆斑表面的传热性能优于超亲水表面。此外，在过冷条件下，所有表面的传热性能下降。增大疏水斑的周长可以提高传热性能。
The effect of subcooling and length of hydrophobic-spot periphery on nucleate pool boiling heat transfer from TiO 2 -coated surface with and without PTFE (polyetatafluoroethylene) hydrophobic circle spots at intermediate heat flux has been examined. The experiments are performed with liquid subcooling ranging from 0-20 K and heat transfer block used were TiO 2 -coated copper block with a PTFE hydrophobic circle spot with various diameters with total area of PTFE being constant. Bubble nucleation and behavior were observed by using high-speed camera. The results showed that the heat transfer performance of surfaces with PTFE hydrophobic circle spot is better than superhydrophilic surface in overall condition. Furthermore, the heat transfer performance decreases under subcooled condition for all surfaces. Increase in peripheral length of hydrophobic-spot enhances the heat transfer performance.