Correlation of sauter mean diameter and critical heat flux for spray cooling of small surfaces
Correlation of sauter mean diameter and critical heat flux for spray cooling of small surfaces
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DOI：
10.1016/0017-9310(95)00046-c
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发表时间：
1995-11
影响因子：
5.2
通讯作者：
K. A. Estes;I. Mudawar
中科院分区：
文献类型：
--
作者：
K. A. Estes;I. Mudawar
为了更好地了解全锥喷雾的核态沸腾换热和临界热流密度，进行了实验研究。考察了喷嘴、体积流量、过冷度和工质对喷雾性能的影响。稠密的喷雾极大地降低了蒸发效率，其沸腾曲线在单相沸腾和核沸腾之间的转变时斜率表现出异常小的增加。Sauter平均直径(SMD)数据成功地关联了表面张力值差异很大的流体。这种关联性是基于液体破碎前的孔口直径以及孔口流动的韦伯数和雷诺数。还开发了一个新的CHF关联式，它准确地预测了FC-72、FC-87和水的数据。这种关联表明CHF与体积通量和Sauter平均直径有很强的相关性。结果表明，通过将CHF和SMD的关联式结合起来，可以准确地预测全锥喷雾的CHF，而不必为每个单独的喷嘴进行昂贵而繁琐的液滴尺寸测量。
Experiments were performed to understand better nucleate boiling heat transfer and critical heat flux (CHF) for full cone sprays. The effects of spray nozzle, volumetric flux, subcooling and working fluid were investigated. Dense sprays greatly reduced evaporation efficiency, and their boiling curves exhibited an unusually small increase in slope upon transition between the single phase and nucleate boiling regimes. Sauter mean diameter (SMD) data were successfully correlated for fluids with vastly different values of surface tension. This correlation was based upon orifice diameter and the Weber and Reynolds numbers of the orifice flow prior to liquid breakup. Also developed was a new CHF correlation which accurately predicted data for FC-72, FC-87 and water. This correlation shows a strong dependence of CHF on volumetric flux and Sauter mean diameter. It is shown that by combining the correlations for CHF and SMD it is possible to predict accurately CHF for full cone sprays without having to conduct expensive and laborious drop sizing measurements for each individual nozzle.