The present research is aimed at analyzing the behavior of small water droplets impinging, with different Weber numbers, on hot, non-porous surfaces. An experimental and theoretical study is conducted, focusing on the influence of the Weber number on the cooling effects induced by droplet impingement and evaporation in presence of nucleate boiling. In order to get more insight into the phenomenon, the droplets behavior is monitored by a high-speed video-camera, and the influence of the Weber number on dropwise evaporative cooling is analyzed. In particular, the conditions which determine the onset of nucleate boiling are emphasized, and the solid surface cooling transients are also monitored via infrared thermography.
Photographic investigation of water droplet impingement and boiling on hot surfaces / Barozzi, Giovanni Sebastiano; Corticelli, Mauro Alessandro; Muscio, Alberto; Tartarini, Paolo. - STAMPA. - I:(1999), pp. 127-138. (Intervento presentato al convegno XVII Congresso Nazionale sulla Trasmissione del Calore tenutosi a Ferrara nel 30 giugno-2 luglio 1999).
Photographic investigation of water droplet impingement and boiling on hot surfaces
BAROZZI, Giovanni Sebastiano;CORTICELLI, Mauro Alessandro;MUSCIO, Alberto;TARTARINI, Paolo
1999
Abstract
The present research is aimed at analyzing the behavior of small water droplets impinging, with different Weber numbers, on hot, non-porous surfaces. An experimental and theoretical study is conducted, focusing on the influence of the Weber number on the cooling effects induced by droplet impingement and evaporation in presence of nucleate boiling. In order to get more insight into the phenomenon, the droplets behavior is monitored by a high-speed video-camera, and the influence of the Weber number on dropwise evaporative cooling is analyzed. In particular, the conditions which determine the onset of nucleate boiling are emphasized, and the solid surface cooling transients are also monitored via infrared thermography.
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