Reduced incipient superheats in boiling of fluids which hold dissolved gas

S. M. You, T. W. Simon, A. Bar-Cohen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations

Abstract

Recently, boiling of dielectric fluids, such as Fluorinert (FC series by 3M), was proposed as a promising cooling mechanism for high-end computer chips and other high-heat-flux power sources. Boiling is a very effective mode of heat transfer, thus, initiation of boiling at the lowest possible heat flux is desirable. Concern over the large superheat values (excess in temperature above the saturation temperature) needed for initiation of nucleate boiling has arisen, however. Incipience superheat is reduced by increasing the radii of embryojic bubbles which serve as nuclei for boiling heat transfer. Two methods for increasing ebryonic radii are evaluated herein for cases where the working fluid is gassy. They both employ mixing for raising the gas partial pressure near the heated surface and slowing condensation of vapor within existing bubbles. When gas is available to the near-wall region, the wall superheat at boiling incipience is sharply decreased. Under this condition, the excursion in wall superheat, which often accompanies high superheat values and is a frequent characteristic of boiling with electronic cooling fluids, is nearly eliminated.

Original languageEnglish (US)
Title of host publicationPhase Change Heat Transfer - 1991
PublisherPubl by ASME
Pages109-117
Number of pages9
ISBN (Print)0791807282
StatePublished - Jan 1 1991
Event28th National Heat Transfer Conference - Minneapolis, MN, USA
Duration: Jul 28 1991Jul 31 1991

Publication series

NameAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume159
ISSN (Print)0272-5673

Other

Other28th National Heat Transfer Conference
CityMinneapolis, MN, USA
Period7/28/917/31/91

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