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International Heat Transfer Conference 13
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

FUNDAMENTAL CONSIDERATION OF BUBBLE LIFT-OFF FREQUENCY IN AN UPWARD FORCED CONVECTIVE SUBCOOLED BOILING FLOW

page 12
DOI: 10.1615/IHTC13.p28.200
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SINOPSIS

A mechanistic model that incorporates the fundamental consideration of bubble frequency and improved wall heat flux partitioning accounting sliding bubbles during low-pressure subcooled flow boiling has been developed. This model combines with a model considering the forces acting on departing bubbles at the heated surface and a three-dimensional two-fluid model with the population balance equations based on the MUSIG (MUltiple-SIze-Group) boiling model are employed to predict subcooled boiling flows at low pressure in a vertical annular channel. Comparison of model predictions against local and axial measurements is made for the void fraction, bubble Sauter mean diameter and interfacial area concentration (IAC) covering a range of different mass and heat fluxes and inlet subcoolings. Good agreement is achieved between the predicted and measured profiles. The predicted growth and waiting times of the bubble frequency are also in reasonable agreement with recent experimental measurements at particular local wall superheat and subcooling temperatures.

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