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Title: A comparison of critical heat flux in tubes and bilaterally heated annuli

Abstract

This paper examines the critical heat flux (CHF) behaviour for annular flow in bilaterally heated annuli and compares it to that in tubes and unilaterally heated annuli. It was found that the differences in CHF between bilaterally and unilaterally heated annuli or tubes strongly depend on pressure and quality. the CHF in bilaterally heated annuli can be predicted by tube CHF prediction methods for the simultaneous CHF occurrence at both surfaces, and the following flow conditions: pressure 7-10 MPa, mass flux 0.5-4.0 Mg/m{sup 2}s and critical quality 0.23-0.9. The effect on CHF of the outer-to-inner surface heat flux ratio, was also examined. The prediction of CHF for bilaterally heated annuli was based on the droplet-diffusion model proposed by Kirillov and Smogalev. While their model refers only to CHF occurrence at the inner surface, we extended it to cases where CHF occurs at the outer surface, and simultaneously at both surfaces, thus covering all cases of CHF occurrence in bilaterally heated annuli. From the annuli CHF data of Becker and Letzter, we derived empirical functions required by the model. the proposed equations provide good accuracy for the CHF data used in this study. Moreover, the equations can predict conditions at whichmore » CHF occurs simultaneously at both surfaces. Also, this method can be used for cases with only one heated surface.« less

Authors:
; ;  [1]
  1. Univ. of Ottawa (Canada)
Publication Date:
Research Org.:
Nuclear Regulatory Commission, Washington, DC (United States). Div. of Systems Technology; American Nuclear Society, La Grange Park, IL (United States); American Inst. of Chemical Engineers, New York, NY (United States); American Society of Mechanical Engineers, New York, NY (United States); Canadian Nuclear Society, Toronto, ON (Canada); European Nuclear Society (ENS), Bern (Switzerland); Atomic Energy Society of Japan, Tokyo (Japan); Japan Society of Multiphase Flow, Kyoto (Japan)
OSTI Identifier:
111419
Report Number(s):
NUREG/CP-0142-Vol.4; CONF-950904-Vol.4
Journal ID: ISSN 0029-5493; ON: TI95017080; TRN: 95:021607
Resource Type:
Conference
Resource Relation:
Journal Volume: 177; Journal Issue: 1-3; Conference: 7. international topical meeting on nuclear reactor thermal-hydraulics (Nureth-7), Saratoga Springs, NY (United States), 10-15 Sep 1995; Other Information: PBD: Sep 1995; Related Information: Is Part Of Proceedings of the 7th International Meeting on Nuclear Reactor Thermal-Hydraulics NURETH-7. Sessions 17-24; Block, R.C.; Feiner, F. [American Nuclear Society, La Grange Park, IL (United States)]; PB: 825 p.
Country of Publication:
United States
Language:
English
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; CRITICAL HEAT FLUX; MATHEMATICAL MODELS; REACTOR CHANNELS; TUBES; HEAT TRANSFER; HYDRAULICS; ANNULAR SPACE; MASS TRANSFER; DRYOUT

Citation Formats

Doerffer, S., Groeneveld, D.C., and Cheng, S.C. A comparison of critical heat flux in tubes and bilaterally heated annuli. United States: N. p., 1995. Web. doi:10.1016/S0029-5493(97)00188-X.
Doerffer, S., Groeneveld, D.C., & Cheng, S.C. A comparison of critical heat flux in tubes and bilaterally heated annuli. United States. doi:10.1016/S0029-5493(97)00188-X.
Doerffer, S., Groeneveld, D.C., and Cheng, S.C. Fri . "A comparison of critical heat flux in tubes and bilaterally heated annuli". United States. doi:10.1016/S0029-5493(97)00188-X. https://www.osti.gov/servlets/purl/111419.
@article{osti_111419,
title = {A comparison of critical heat flux in tubes and bilaterally heated annuli},
author = {Doerffer, S. and Groeneveld, D.C. and Cheng, S.C.},
abstractNote = {This paper examines the critical heat flux (CHF) behaviour for annular flow in bilaterally heated annuli and compares it to that in tubes and unilaterally heated annuli. It was found that the differences in CHF between bilaterally and unilaterally heated annuli or tubes strongly depend on pressure and quality. the CHF in bilaterally heated annuli can be predicted by tube CHF prediction methods for the simultaneous CHF occurrence at both surfaces, and the following flow conditions: pressure 7-10 MPa, mass flux 0.5-4.0 Mg/m{sup 2}s and critical quality 0.23-0.9. The effect on CHF of the outer-to-inner surface heat flux ratio, was also examined. The prediction of CHF for bilaterally heated annuli was based on the droplet-diffusion model proposed by Kirillov and Smogalev. While their model refers only to CHF occurrence at the inner surface, we extended it to cases where CHF occurs at the outer surface, and simultaneously at both surfaces, thus covering all cases of CHF occurrence in bilaterally heated annuli. From the annuli CHF data of Becker and Letzter, we derived empirical functions required by the model. the proposed equations provide good accuracy for the CHF data used in this study. Moreover, the equations can predict conditions at which CHF occurs simultaneously at both surfaces. Also, this method can be used for cases with only one heated surface.},
doi = {10.1016/S0029-5493(97)00188-X},
journal = {},
number = 1-3,
volume = 177,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 1995},
month = {Fri Sep 01 00:00:00 EDT 1995}
}

Conference:
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