Bubble behavior and mean bubble diameter in subcooled upward flow boiling in a vertical annular channel were investigated under low pressure and mass flux conditions. A high-speed video system was used to visualize the subcooled flow boiling phenomenon. The high-speed photographic results indicated that, contrary to the common understanding, bubbles tend to detach from the heating surface upstream of the net vapor generation point. Digital image processing technique was used to measure the mean bubble diameter along the subcooled flow boiling region. Data on the axial area-averaged void fraction distributions were also obtained using a single-beam gamma densitometer. Effects of the liquid subcooling, applied heat flux, and mass flux on the mean bubble size were investigated. A correlation for the mean bubble diameter as a function of the local subcooling, heat flux, and mass flux was obtained.

Issue Section:
Boiling and Condensation
Keywords:
Boiling, Multiphase Flows, Phase-Change Phenomena
Topics:
Boiling, Bubbles, Flow (Dynamics), Subcooling
1.
Abdelmessih
A. H.
,
Hooper
F. C.
, and
Nangia
S.
,
1972
, “
Flow Effects on Bubble Growth and Collapse in Surface Boiling
,”
Int. J. Heat Mass Transfer
, Vol.
15
, pp.
115
–
125
.
2.
Akiyama
M.
, and
Tachibana
F.
,
1974
, “
Motion of Vapour Bubbles in Subcooled Heated Channel
,”
Bulletin of the JSME
, Vol.
104
, pp.
241
–
247
.
3.
Beer, H., Burow, P., and Best, R., 1977, “Bubble Growth, Bubble Dynamics, and Heat Transfer in Nucleate Boiling, Viewed With a Laser Interferometer,” in: Heat Transfer in Boiling, E. Hahne and U. Grigull, ed., Hemisphere Publishing Corp., Ch. 2, pp. 21–52.
4.
Bibeau
E. L.
, and
Salcudean
M.
,
1990
, “
The Effect of Flow Direction on Void Growth at Low Velocities and Low Pressure
,”
Int. Comm. Heat Mass Transfer
, Vol.
17
, pp.
19
–
25
.
5.
Bibeau, E. L., 1993, “Void Growth in Subcooled Flow Boiling for Circular and Finned Geometries for Low Values of Pressure and Velocity,” Ph.D. Thesis, The University of British Columbia.
6.
Bibeau
E. L.
, and
Salcudean
M.
,
1994
, “
A Study of Bubble Ebullition in Forced Convective Subcooled Nucleate Boiling at Low Pressure
,”
Int. J. Heat Mass Transfer
, Vol.
37
, pp.
2245
–
2259
.
7.
Bowring, R. W., 1962, “Physical Model Based on Bubble Detachment and Calculation of Steam Voidage in the Subcooled Region of a Heated Channel,” HPR-10, Institute for Atomenergi, Halden.
8.
Cooper
M. G.
,
Mori
K.
, and
Stone
C. R.
,
1983
, “
Behaviour of Vapour Bubbles Growing at a Wall With Forced Flow
,”
Int. J. Heat Mass Transfer
, Vol.
26
, pp.
1489
–
1507
.
9.
Dimmick, G. R., and Selander, W. N., 1990, “A Dynamic Model for Predicting Subcooled Void: Experimental Results and Model Development,” EUROTHERM Seminar #16.
10.
Dix, G. E., 1970, “Vapour Void Fraction for Forced Convection With Subcooled Boiling at Low Flow Rates,” General Electric Report No. NEDO-10491.
11.
Griffith, P., Clark, J. A., and Rohsenow, W. M., 1958, “Void Volumes in Subcooled Boiling,” ASME Paper No. 58-HT-19.
12.
Gunther
F. C.
,
1951
, “
Photographic Study of Surface-Boiling Heat Transfer to Water With Forced Convection
,”
Transaction of ASME
, Vol.
73
, pp.
115
–
123
.
13.
Jain
P. K.
,
Nourmohammadi
K.
, and
Roy
R. P.
,
1980
, “
A Study of Forced Convective Subcooled Boiling in Heated Annular Channels
,”
Nuc. Eng. and Design
, Vol.
60
, pp.
401
–
411
.
14.
Koumoutsos
N.
,
Moissis
R.
, and
Spyridonos
A.
,
1968
, “
A Study of Bubble Departure in Forced-Convection Boiling
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
90
, pp.
223
–
230
.
15.
Lee
S. C.
, and
Bankoff
S. G.
,
1992
, “
Prediction of the Onset of Significant Void in Down Flow Subcooled Nucleate Boiling
,”
Two-Phase Flow and Heat Transfer
, ASME HTD-Vol.
197
, pp.
93
–
100
.
16.
Levy
S.
,
1967
, “
Forced Convection Subcooled Boiling: Prediction of Vapour Volumetric Fraction
,”
Int. J. Heat Mass Transfer
, Vol.
10
, pp.
951
–
965
.
17.
Meister
G.
,
1979
, “
Vapour Bubble Growth and Recondensation in Subcooled Boiling Flow
,”
Nuclear Engineering and Design
, Vol.
54
, pp.
97
–
114
.
18.
Rogers
J. T.
,
Salcudean
M.
,
Abdullah
Z.
,
McLeod
D.
, and
Poirier
D.
,
1987
, “
The Onset of Significant Void in Up-flow Boiling of Water at Low Pressure and Low Velocities
,”
Int. J. Heat Mass Transfer
, Vol.
30
, No.
11
, pp.
2247
–
2260
.
19.
Rogers
J. T.
, and
Li
J.
,
1992
, “
Prediction of the Onset of Significant Void in Flow Boiling of Water
,”
Fundamentals of Subcooled Flow Boiling
, ASME HTD-Vol.
217
, pp.
41
–
52
.
20.
Serizawa, A., 1979, “A Study of Forced Convection Subcooled Flow Boiling,” Two-Phase Momentum, Heat and Mass Transfer in Chemical Processes and Energy Engineering Systems, F. Drust, G. V. Tsiklauri, and N. H. Afgan, eds., Vol. I, pp. 231–242.
21.
Shoukri, M., Judd, R. L., Donevski, B., and Dimmick, G. R., 1991, “Experiments on Subcooled Flow Boiling and Condensation in Vertical Annular Channels,” in: Phase-Interface Phenomena in Multiphase Flow, G. F. Hewitt, F. Mayinger, and J. R. Rizinic, eds., Hemisphere Pub. Corp., pp. 413–422.
22.
Stangl
G.
, and
Mayinger
F.
,
1990
, “
Void Fraction Measurement in Subcooled Forced Convection Boiling With Refrigerant 12
,”
Experimental Heat Transfer
, Vol.
3
, pp.
323
–
340
.
23.
U¨nal
H. C.
,
1976
, “
Maximum Bubble Diameter, Maximum Bubble-Growth Time and Bubble-Growth Rate During the Subcooled Nucleate Flow Boiling of Water up to 17.7 MN/m2
,”
Int. J. Heat Mass Transfer
, Vol.
19
, pp.
643
–
649
.
24.
Zeitoun
O.
,
Shoukri
M.
, and
Chatoorgoon
V.
,
1994
, “
Measurement of Interfacial Area Concentration in Subcooled Liquid-Vapour Flow
,”
Nuc. Eng. and Design
, Vol.
152
, pp.
243
–
255
.
25.
Zeitoun, O., 1994, “Subcooled Flow Boiling and Condensation,” Ph.D. Thesis, McMaster University, Hamilton, Ontario, Canada.
26.
Zeitoun, O., and Shoukri, M., 1995, “On the Net Vapour Generation Phenomenon in Low Pressure and Low Mass Flux Subcooled Flow Boiling,” Proceedings of the Engineering Foundation Conference on Convective Flow Boiling, Banff, Canada.
27.
Zeng
L. Z.
,
Klausner
J. F.
, and
Mei
R.
,
1993
a, “
A Unified Model for the Prediction of Bubble Detachment Diameters in Boiling Systems—I. Pool Boiling
,”
Int. J. Heat Mass Transfer
, Vol.
36
, pp.
2261
–
2270
.
28.
Zeng
L. Z.
,
Klausner
J. F.
,
Bernhard
D. M.
, and
Mei
R.
,
1993
b, “
A Unified Model for the Prediction of Bubble Detachment Diameters in Boiling Systems—II. Flow Boiling
,”
Int. J. Heat Mass Transfer
, Vol.
36
, pp.
2271
–
2279
.
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