Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 55, Issue 19-20, Pages 5357-5366Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2012.05.054
Keywords
Spray cooling; Temperature distribution; Surface temperature non-uniformity
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Funding
- National Science Foundation of China [50876096]
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In this study, the effects of droplet velocity non-uniformity, SMD (Sauter mean diameter) distribution non-uniformity, droplet number non-uniformity, and heating power on the fluid film thickness, fluid film velocity, and surface temperature distribution were investigated, and then the surface temperature non-uniformity correlations in non-boiling regime and nucleate boiling regime were correlated. The results show that: with the decreasing of the spray parameters non-uniformity, the fluid film thickness on the heating surface becomes mare uniform, and the fluid film velocity increases, thus the surface temperature non-uniformity decreases. The highest surface temperature appears in the centre of the heating surface, and the lowest is nearby the position where the fluid film appears. The droplet number non-uniformity contributes the largest portion of impact on the surface temperature non-uniformity, followed by the droplet velocity non-uniformity. The effect of droplet SMD non-uniformity is the minimal. Finally, the surface temperature nor.-uniformity correlations in non-boiling regime and nucleate boiling regime were correlated with a mean absolute error of 20%. (C) 2012 Elsevier Ltd. All rights reserved.
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