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Title: Transient Pool Boiling Critical Heat Flux of FC-72 Under Saturated Conditions

In this study, the steady-state and transient critical heat fluxes (CHFs) in pool boiling were measured on 1.0 mm diameter horizontal cylinders of gold and platinum heaters under saturated conditions due to transient heat inputs, Q{sub 0}exp(t/t), in a pool of Fluorinert FC-72. Heaters were heated by electric current with the periods, t, ranged from 10 ms to 20 s, and the pressures ranged from atmospheric up to around 1.2 MPa. The steady-state CHFs measured are dependent on pressure and almost agree with the values obtained by Kutateladze's correlation based on hydrodynamic instability (HI) model. It was considered that the boiling inception and the direct transition during the steady-state period occur by the pre-pressure of {approx}1.2 MPa. The trend of typical transient CHFs were clearly divided into the first, second, and third groups for long, short, and intermediate periods, respectively. The direct transition processes to film boiling without nucleate boiling for the short periods obtained from both heaters were confirmed due to the heterogeneous spontaneous nucleation (HSN) in flooded cavities on the cylinder surface. The empirical correlations to express each of corresponding CHFs measured on both heaters for the short periods are presented in this paper. (authors)
Authors:
; ;  [1] ;  [2]
  1. Kobe University, Graduate School of Science and Technology, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe 658-0022 (Japan)
  2. Oshima National College of Maritime Technology, 1091-1 Komatsu Suou, Oshima-city, Oshima County, Yamaguchi 742-2193 (Japan)
Publication Date:
OSTI Identifier:
20997053
Resource Type:
Conference
Resource Relation:
Conference: 14. International conference on nuclear engineering (ICONE 14), Miami - Florida (United States), 17-20 Jul 2006; Other Information: Country of input: France
Publisher:
American Society of Mechanical Engineers - ASME, New York (United States)
Research Org:
The ASME Foundation, Inc., Three Park Avenue, New York, NY 10016-5990 (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; CAVITIES; CORRELATIONS; CRITICAL HEAT FLUX; CYLINDERS; ELECTRIC CURRENTS; FILM BOILING; GOLD; HEAT; HEATERS; INSTABILITY; NUCLEATE BOILING; NUCLEATION; PLATINUM; PONDS; POOL BOILING; PRESSURE RANGE; STEADY-STATE CONDITIONS; SURFACES; TRANSIENTS