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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

HEAT TRANSFER IN POOL BARBOTAGE

Get access (open in a dialog) DOI: 10.1615/IHTC6.3690
pages 127-132

Sinopsis

In the present study, local instantaneous heat-transfer coefficients on a heat-transfer surface in the vicinity of barbotage bubbles ("barbotage" is the bubbling of a gas into a liquid) were measured under conditions of constant supply pressure, as well as for the first time, constant flow rate. Air at different rates was bubbled into either n-hexane or toluene. A technique of combined high-speed cine-photography and oscillography allowed the relationship between the instantaneous values of the heat-transfer coefficient on the surface and the bubble cycle to be unambiguously determined. The heat-transfer results were combined with results obtained from a hydrogen-bubble flow visualization study; the flow pattern and instantaneous velocity of the liquid about an air bubble in water were used to explain the behaviour of the heat-transfer coefficient as a function of time. A comparison of the instantaneous heat-transfer coefficients in the present study and those reported for boiling toluene was also performed.