Critical heat flux in thin, uniform particle coatings
Critical heat flux in thin, uniform particle coatings
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2005.09.020
复制
发表时间：
2006-03
影响因子：
5.2
通讯作者：
G. Hwang;M. Kaviany
中科院分区：
文献类型：
--
作者：
G. Hwang;M. Kaviany
采用不同的铜颗粒直径（40 ~ 80μm）、不同的制备方法（松散堆积、摇动或压制）和不同的颗粒特性（固体或多孔颗粒），对薄而均匀的多孔涂层上的池沸腾进行了实验研究，涂层厚度为3 ~ 5个颗粒直径。结果表明，所有涂层的临界热流密度（CHF）约为1.8倍，而在CHF前的制度表现出变化。我们建议，薄的，均匀的多孔涂层的存在下的影响的流体动力学（宏观）的稳定性，使统计的临界瑞利-泰勒波长减少和/或蒸汽面积分数增加的方式，统计导致减少的主要界面波长。根据CHF实验结果，假设CHF增大2倍时，Zuber CHF模型中的波长约为平表面的1/4，即蒸汽通道面积增加22/3（与平表面相比）。
Pool boiling on thin, uniform porous coatings is examined experimentally using different copper particle diameters (between 40 and 80μm), fabrications (loosely packed, shaken, or pressed), and particle characteristics (solid or porous particle) with coating thickness varying between 3 and 5 particle diameters. The results show that the critical heat flux (CHF) is about 1.8 times for all the coatings, while the pre-CHF regime shows variations. We suggest that the presence of the thin, uniform porous coating influences the hydrodynamic (macroscale) stabilities such that statistically the critical Rayleigh–Taylor wavelength decreases and/or the vapor area fraction increases in a manner to statistically cause a decrease in the dominant interfacial wavelength. By the CHF experimental results, it is postulated that for a 2-fold increase in CHF, the wavelength in the Zuber CHF model is nearly one-fourth of that for plain surface, or the area of the vapor channels increases by 22/3(compared to plain surface).