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

Abstract

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:
Research Org.:
The ASME Foundation, Inc., Three Park Avenue, New York, NY 10016-5990 (United States)
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
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

Citation Formats

Fitri, Sutopo P., Katsuya Fukuda, Qiusheng Liu, and Jongdoc Park. Transient Pool Boiling Critical Heat Flux of FC-72 Under Saturated Conditions. United States: N. p., 2006. Web.
Fitri, Sutopo P., Katsuya Fukuda, Qiusheng Liu, & Jongdoc Park. Transient Pool Boiling Critical Heat Flux of FC-72 Under Saturated Conditions. United States.
Fitri, Sutopo P., Katsuya Fukuda, Qiusheng Liu, and Jongdoc Park. Sat . "Transient Pool Boiling Critical Heat Flux of FC-72 Under Saturated Conditions". United States. doi:.
@article{osti_20997053,
title = {Transient Pool Boiling Critical Heat Flux of FC-72 Under Saturated Conditions},
author = {Fitri, Sutopo P. and Katsuya Fukuda and Qiusheng Liu and Jongdoc Park},
abstractNote = {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)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2006},
month = {Sat Jul 01 00:00:00 EDT 2006}
}

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  • In this paper, we further evaluate our previously postulated transient CHF model. First, we verify the steady-state CHF model on which the transient model is based by using recent macrolayer-thickness data. We also include the effect of thermal storage in the heater that we previously neglected. The use of a simplified approach in the prediction of the instantaneous surface heat flux for given pwoer generation rates considerably improves the predictive capability of the transient critical heat-flux (CHF) model. Finally, we discuss the statistical vapor mass behavior during transient boiling and its effect on the transient CHF model. We show thatmore » the data scatter within a small range may be partially explained through such an approach.« less
  • In this paper, we further investigate the hypothesis that the critical heat flux (CHF) occurs when some point on the heated surface reaches a high enough temperature that liquid can no longer contact that point, resulting in a gradual but continuous increase in the overall surface temperature. This hypothesis unifies the occurrence of the CHF and the quenching of hot surfaces by relating both to the same concept, i.e., the ability of a liquid to contact a hot surface. We use a two-dimensional transient conduction model to study the boiling phenomenon in the second transition region of saturated pool nucleatemore » boiling on a horizontal surface. The heater surface is assumed to consist of two regions: a dry patch region formed as a result of complete evaporation of the thinner liquid macrolayers and a two-phase macrolayer region formed by numerous vapor stems penetrating relatively thick liquid macrolayers. The constitutive relations used to determine the stem-macrolayer configuration in the two-phase macrolayer region of the boiling surface were reevaluated for Gaertner's clean water and water-nickel/salt solution. 29 refs.« less
  • Understanding and predicting critical heat flux (CHF) behavior during steady-state and transient conditions is of fundamental interest in the design, operation, and safety of boiling and two-phase flow devices. Presented within this paper are the results of a comprehensive theoretical study specifically conducted to model transient CHF behavior in saturated pool boiling. Thermal energy conduction within a heating element and its influence on the CHF are also discussed. The resultant theory provides new insight into the basic physics of the CHF phenomenon and indicates favorable agreement with the experimental data from cylindrical heaters with small radii. However, the flat-ribbon heatermore » data compared poorly with the present theory, although the general trend was predicted. Finally, various factors that affect the discrepency between the data and the theory are listed.« less
  • In this paper, we further investigate the hypothesis that the critical heat flux (CHF) occurs when some point on the heated surface reaches a high enough temperature that liquid can no longer contact that point, resulting in a gradual but continuous increase in the overall surface temperature. This hypothesis unifies the occurrence of the CHF and the quenching of hot surfaces by relating both to the same concept, i.e., the ability of a liquid to contact a hot surface. We use a two-dimensional transient conduction model to study the boiling phenomenon in the second transition region of saturated pool nucleatemore » boiling on a horizontal surface. The heater surface is assumed to consist of two regions: a dry patch region formed as a result of complete evaporation of the thinner liquid macrolayers and a two-phase macrolayer region formed by numerous vapor stems penetrating relatively thick liquid macrolayers. The constitutive relations used to determine the stem-macrolayer configuration in the two-phase macrolayer region of the boiling surface were reevaluated for Gaertner`s clean water and water-nickel/salt solution. 29 refs.« less