期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 147, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2019.118960
关键词
Surface orientation; Critical heat flux; Spray cooling; Intermittent spray cooling
资金
- National Natural Science Foundation of China, China [51876020]
- Joint Fund of Equipment Development Department Pre-research Project, China
- Ministry of Education of China, China [6141A02022505]
In this study, the heat transfer performances of spray cooling for upward, vertical, and downward surfaces under different nozzle-to-surface distances, inlet pressures, nozzle types, and surface areas were investigated experimentally. Almost no difference in heat transfer performance can be found among the different orientations in single-phase and two-phase regimes. A considerable orientation dependency of the critical heat flux (CHF) can be observed in medium-spray volumetric fluxes: the CHF of the vertical surface is higher than that of the upward and downward surfaces. The orientation dependency of the CHF reduces as the inlet pressure increases, implying that an increase in droplet diameter or decrease in droplet velocity would enhance this dependency. The surface orientation has no significant effect on surface liquid film flow and temperature distribution. In this paper, interaction between the vapour and spray (or surface wall) is proposed and verified to be the main mechanism that affects orientation dependency by intermittent spray cooling. A macrolayer model for the CHF is semi-empirically introduced to account for the orientation effects and provide a quantitative evaluation of these effects. Finally, based upon this model, a general correlation for the CHF is proposed. (C) 2019 Elsevier Ltd. All rights reserved.
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