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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

BUBBLE DEPARTURE IN FORCED CONVECTIVE SUBCOOLED BOILING FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC13.p28.220
12 pages

Resumo

Forced convective subcooled boiling flow experiments were conducted in a BWR-scaled vertical upward annular channel. Water was used as the testing fluid, and the tests were performed at atmospheric pressure. A high-speed digital video camera was applied to capture the dynamics of the bubble nucleation process. Bubble departure frequencies were obtained from the video for a total of 92 test conditions. The departure frequency increases as the increase of inlet temperature or heat flux, or the decrease of inlet fluid velocity. A force balance analysis of a growing bubble was performed to predict the bubble departure size to be around 10−4 m. The departure frequency is modelled by taking account of transient heat conduction and bubble growth rate. Comparison with experiments suggests that departure frequency falls into two regions: subcooled region and saturate region. The proposed bubble departure frequency model agreed fairly well with the experimental data.