Abstract
The heat-transfer characteristics of a single droplet and spray impacting upon a horizontal surface heated above the Leidenfrost temperature are analytically investigated. The heat-transfer model of a single impacting droplet is developed, based on the postulate that heat transfer through direct contact is the dominant mechanism of the droplet impacting heat transfer. Heat-transfer models of spray are also developed by expanding the single droplet model to include the effects of droplet interference upon the impacting dynamics. A criterion value of liquid mass flux for classifying a spray as sparse or dense is established. The analytical models are compared with the existing experimental results, and they are found to be in good agreement.
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