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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

DIRECT-CONTACT HEAT TRANSFER TO DROPS IN AN INTERMITTENT ELECTRIC FIELD

Get access (open in a dialog) DOI: 10.1615/IHTC6.2870
pages 165-170

Sinopsis

This paper proposes a new technique of electrical augmentation of heat transfer to or from drops passing through a second immiscible liquid. An intermittent electric field is periodically applied perpendicular to the trajectory of drops. The drops exhibit periodical oscillation due to the electric stress at the drop surface and the gradient of capillary pressure inside the drops. The effects of such an electrically forced oscillation on heat transfer have been examined experimentally with water drops rising in methylphenyl silicone oil. The heat transfer coefficient increases drastically as the strength of applied electric field increases up to a critical value at which drops burst. At a particular frequency of the field the heat transfer coefficient peaks. The frequency and the duty ratio of the field should be determined according to the resonant frequency of drops depending on the strength of the field to yield the most effective augmentation.