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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

BUBBLE LIFT-OFF IN FORCED CONVECTIVE SUBCOOLED BOILING FLOW

R. Situ
RMIT University, Bundoora, Australia

T. Hibiki
Kyoto University, Kumatori, Japan

Mamoru Ishii
Therma-Hydraulics and Reactor Safety Laboratory, School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN 47907, USA

Michitsugu Mori
Tokyo Electric Power Company, Yokohama, Kanagawa, Japan

Jiyuan Tu
School of Engineering, RMIT University, Bundoora, VIC 3083, Australia; Key Laboratory of Ministry of Education for Advanced Reactor Engineering and Safety, Institute of Nuclear and New Energy Technology, Tsinghua University, 30 Shuang Qing Rd. Haidian District, Beijing 100086, China

Guan Heng Yeoh
School of Mechanical and Manufacturing Engineering University of New South Wales, NSW 2052, Australia; Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSW 2234, Australia

Goon Cherl Park
Department of Nuclear Engineering, Seoul National University, Shillim-Dong, Gwanak-Gu, Seoul 151-742, Korea

DOI: 10.1615/IHTC13.p28.210
12 pages

Abstract

Bubble lift-off is different from bubble departure, and it is more suitable for the boundary condition for numerical simulation of subcooled boiling flow. A force balance analysis of a growing bubble was performed to predict the bubble lift-off size. The dimensionless form of the bubble lift-off diameter was formulated to be a function of Jacob number and Prandtl number. The modeling of bubble lift-off frequency requires careful study of bubble collapse during sliding. 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 lift-off diameters and lift-off frequencies were obtained from the images for a total of 92 test conditions. The bubble lift-off frequency was found to be same as the bubble departure frequency. The proposed bubble lift-off diameter model agreed well with the experimental data within the averaged relative deviation of ±33.6 %.

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Measurement of fluid temperature with an arrangement of three thermocouples