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Multiphase Science and Technology
SJR: 0.124 SNIP: 0.222 CiteScore™: 0.26

ISSN Печать: 0276-1459
ISSN Онлайн: 1943-6181

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Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v12.i3-4.50
19 pages

THE INFLUENCE OF SUBCOOLING ON POOL BOILING HEAT TRANSFER AND ITS ACOUSTIC MANIFESTATION

Jens J. Schroder
Institute for Thermodynamics, University of Hannover Hannover, Germany
Andreas Bode
Institute for Thermodynamics, University of Hannover Hannover, Germany; BASF AG, Process Engineering, GCT/D - L540, D-67056 Ludwigshafen

Краткое описание

This paper shows how subcooling influences even fully developed boiling heat transfer. This influence is audibly accompanied by a change of sound emission. Experimental results with water as test fluid reveal that the heat transfer coefficient in first approximation does not only depend on the heat flux and the reduced pressure but also on the Jakob number. The latter dependency is not uniformly directed - it reverses while subcooling is increased. Beyond a critical value, different boiling modes may substitute or supply each other in a spatio-temporal alternation on the heating surface. Consequently, boiling curves with contradicting behavior appear. A calculation method based on a simplified model is proposed and compared with experimental results.


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