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Journal Articles

Prediction of heater surface temperature change at subcooled flow boiling DNB

Liu, W.; Podowski, M. Z.*

Nihon Kikai Gakkai Netsu Kogaku Konfarensu 2015 Koen Rombunshu (CD-ROM), 2 Pages, 2015/10

This paper gives prediction to the transient heat transfer at Departure of Nucleate Boiling (DNB) point for subcooled flow boiling. The prediction is carried out by solving the heat conduction equations in cylindrical coordinates with convective boundary condition, which changes with the change of the heat transfer mode on the heated surface. DNB is assumed to happen at the complete dryout of liquid sublayer trapped between the heated wall and an elongated vapor clot, during the passing time of the vapor clot. Important parameters including initial thickness of the liquid sublayer, vapor clot length, vapor clot velocity and void fraction etc., are calculated from the Liu - Nariai model. The initial heater surface temperature is derived from the Jens-Lottes correlation. The transient changes of liquid sublayer thickness, surface temperature at DNB are reported. No obvious temperature jumping is observed at DNB. To predict temperate excursion at Critical Heat Flux (CHF), more simulations to the transient boiling and film boiling processes are needed.

Journal Articles

Ultrahigh CHF prediction for subcooled flow boiling based on homogenous nucleation mechanism

Liu, W.; Nariai, Hideki*

Journal of Heat Transfer, 127(2), p.149 - 158, 2005/02

 Times Cited Count:9 Percentile:41.85(Thermodynamics)

Homogeneous nucleation, although being discounted as a mechanism for vapor formation for water in most conditions, is found being possible to occur under some extreme conditions in subcooled flow boiling. In this paper, firstly, the existence of the homogeneous nucleation governed condition is indicated. Followed, a criterion is developed to judge a given working condition is the conventional one or the homogeneous nucleation governed one. With the criterion, subcooled flow boiling data are categorized and typical homogeneous nucleation governed datasets are listed. CHF triggering mechanism for the homogeneous nucleation governed condition is proposed and verified. Parametric trends of the CHF, in terms of mass flux, pressure, inlet subcooling, channel diameter and the ratio of heated length to diameter are also studied.

Journal Articles

Study of critical heat flux mechanism in flow boiling using bubble crowding model; Application to CHF in short tube and in tube with twisted tape under non-uniform heating conditions

Kinoshita, Hidetaka; Nariai, Hideki*; Inasaka, Fujio*

JSME International Journal, Series B, 44(1), p.81 - 89, 2001/01

no abstracts in English

Journal Articles

Critical heat flux in subcooled water flow of one-side-heated screw tubes

J.Boscary*; Araki, Masanori; ; *; Akiba, Masato

Fusion Technology, 35(3), p.289 - 296, 1999/05

no abstracts in English

JAEA Reports

Analysis of the JAERI critical heat flux data base for fusion application

J.Boscary*; Araki, Masanori; Akiba, Masato

JAERI-Research 97-053, 50 Pages, 1997/08

JAERI-Research-97-053.pdf:1.71MB

no abstracts in English

JAEA Reports

Critical heat flux database of JAERI for high heat flux components for fusion application

J.Boscary*; Araki, Masanori; Akiba, Masato

JAERI-Data/Code 97-033, 12 Pages, 1997/08

JAERI-Data-Code-97-033.pdf:0.51MB

no abstracts in English

Journal Articles

Experimental study of incipient nucleate boiling in narrow vertical rectangular channel simulating subchannel of upgraded JRR-3

Sudo, Yukio; *; ; Kaminaga, Masanori

Journal of Nuclear Science and Technology, 23(1), p.73 - 82, 1985/00

 Times Cited Count:31 Percentile:92.89(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Thermal and Structural Design Study of Divertor Collector Plates

*; ;

JAERI-M 9945, 25 Pages, 1982/01

JAERI-M-9945.pdf:0.77MB

no abstracts in English

Oral presentation

Macrolayer formation model for prediction of critical heat flux in saturated and subcooled pool boiling

Ono, Ayako; Sakashita, Hiroto*

no journal, , 

A macrolayer formation model for saturated and subcooled pool boiling is proposed, which is developed based on the visual observation of boiling behavior. The distribution of nucleation sites is assumed to distribute based on Poisson distribution. The predicted macrolayer thicknesses are used for the prediction of CHFs in saturated and subcooled pool boiling based on the macrolayer dryout model. The combination of the macrolayer dryout model and macrolayer formation model is able to predict the CHF well at least up to subcooling 40K.

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