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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018016441
pages 1199-1218

BUBBLE BEHAVIOR AND BUBBLE GROWTH MODEL OF HIGHLY SUBCOOLED FLOW BOILING IN A VERTICAL RECTANGULAR CHANNEL

Dewen Yuan
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu 610041, PR China
Xiao Yan
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu 610041, PR China; Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China; Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL, 61801, USA
Deqi Chen
Key Laboratory of Low-Grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 40044, PR China
Yunke Zhong
Key Laboratory of Low-Grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 40044, PR China
Yanping Huang
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu 610041, PR China
Jianjun Xu
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu 610041, PR China

SINOPSIS

In the paper, a visual investigation was carried out to study the bubble behavior phenomena with upward subcooled flow boiling in a narrow channel, with a gap of 2 mm. It was found that the bubbles grew up rapidly at different nucleation sites and then condensed subsequently with high bulk subcooling, under system pressures of 0.1 MPa and 0.3 MPa. Under a system pressure of 0.6 MPa and 1.0 MPa, bubbles were generated continuously at different nucleation sites and slid along the heating surface during the growing process. Based on the experimental study, a bubble growth model was proposed with consideration of the bubble behavior and the local thermal condition near the heating wall; the parameters of the proposed model considered the effect of wall superheating and the degree of bulk subcooling, and the Reynolds number Re considered the bulk velocity; these considerations were used to modify the Zuber model. Then the proposed bubble growth model was used to predict the bubble growing process.


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