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Titolo:
A procedure to predict subcooled-water-flow-boiling CHF in uniformly heated tubes for high-heat-flux applications
Autore:
Kwon, YM; Chang, SH;
Indirizzi:
Korea Atom Energy Res Inst, Kalimer Safety Anal Dept, Taejon 305353, SouthKorea Korea Atom Energy Res Inst Taejon South Korea 305353 305353, SouthKorea Korea Atom Energy Res Inst, Dept Nucl Engn, Taejon 305701, South Korea Korea Atom Energy Res Inst Taejon South Korea 305701 305701, South Korea
Titolo Testata:
NUCLEAR TECHNOLOGY
fascicolo: 3, volume: 130, anno: 2000,
pagine: 310 - 328
SICI:
0029-5450(200006)130:3<310:APTPSC>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SMALL-DIAMETER TUBES; LOW QUALITIES; MODEL; UPFLOW;
Keywords:
critical heat flux; subcooled flow boiling; high heat flux;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Kwon, YM Korea Atom Energy Res Inst, Kalimer Safety Anal Dept, 150 Dukjin,Taejon 305353, South Korea Korea Atom Energy Res Inst 150 Dukjin Taejon South Korea 305353
Citazione:
Y.M. Kwon e S.H. Chang, "A procedure to predict subcooled-water-flow-boiling CHF in uniformly heated tubes for high-heat-flux applications", NUCL TECH, 130(3), 2000, pp. 310-328

Abstract

A model to predict critical heat flux (CHF) for high-heat-flux subcooled flow boiling in uniformly heated tubes is proposed. The present CHF model isbased on the mechanism of wall-attached bubble coalescence. To take into account the enhanced condensation due to high subcooling and high mass velocity in small-diameter tubes, a mechanistic approach is adopted to evaluate the non-equilibrium flow quality and void fraction in the subcooled water flow boiling. Comparison of the model predictions against similar to 3100 subcooled water CHF data shows relatively good agreement over a wide range ofparameters that covers the operating conditions of fusion reactor components. The operating ranges of the present database cover 0.33 less than or equal to D less than or equal to 37.5 mm, 0.002 less than or equal to L less than or equal to 4 m, 0.1 less than or equal to P less than or equal to 20 MPa, 0.37 less than or equal to G less than or equal to 134 Mg/m(2) . s, 49less than or equal to Delta h(sub, in) less than or equal to 1659 kJ/kg, -1.25 less than or equal to x(em) < 0 and 1.05 less than or equal to q(CHF) less than or equal to 276 MW/m(2).

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Documento generato il 09/07/20 alle ore 14:19:14