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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

CAPILLARY FLOWS AROUND HEMISPHERICAL BUBBLES

Get access (open in a dialog) DOI: 10.1615/IHTC7.3720
pages 15-20

Sinopsis

The behavior of capillary flow around a hemispherical bubble on a plane surface, surface, in both thermal and concentration gradients, has been examined. Transient and asymptotic temperature and flow fields were determined using finite difference formulations and explicit numerical procedures for solution. Two wall boundary conditions on the plane were studied: constant temperature and constant heat flux, solutions for which exhibited markedly different flow field behavior. Three specific cases were studied: two in which thermocapi11arity alone was considered for the adiabatic and diabatic bubble cases, and the third in which thermal and concentration effects on surface tension were considered simultaneously. Full ranges of temperature and concentration based Marangoni numbers were studied, demonstrating that the overall influence of capillarity on boiling heat transfer was small. The presence of a gravitational field was found to be very influential on the flow field behavior, particularly for a downward facing bubble. The competitive interplay between thermal and concentration driven capillary flows in liquid inclusions in a soluble field and with a significant gas or vapor bubble volume was found to control both the rate and direction of inclusion migration.