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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

ENHANCEMENT OF EVAPORATION OF A DROPLET FROM A HOT SURFACE BY ELECTRIC FIELD

Get access (open in a dialog) DOI: 10.1615/IHTC9.1320
pages 69-74

Résumé

Effectiveness of a static electric field for enhancement of evaporation of a droplet on a heated surface is investigated. Since boiling or evaporation of liquid is very important in a variety of energy conversion devices, finding out an effective means of enhancement will bring about a most remarkable improvement of heat exchange technology. In order to understand the fundamental characteristics of the EHD (electro-hydrodynamic) effect on evaporation, an experiment is carried out by placing a single liquid droplet on a high-temperature surface. The static electric field is applied between the surface and a thin wire which holds the droplet. The time needed for the single droplet (of water, KC1 solution, or ethanol) to evaporate is measured at different surface temperatures and electric field intensities. The results indicate that the electric field is very effective in enhancing evaporation of the drop. The mechanism of enhancement is investigated from a view point of stability of the liquid-vapor interface.