Abstract

Visualized experimental observation on flow patterns during flow boiling of water under single-side heated and fluid-inlet subcooled conditions in a vertical narrow rectangular channel with the cross section of 40×3 mm2 have been carried out. Four discernible flow patterns, which names dispersed bubbly, coalesced bubbly, churn flow, and annular flow are observed. Flow visualization in two dimensions of two-phase flow patterns for narrow rectangular channel, which provided clearer evidence to distinguish flow patterns, have been performed. Based on the experimental results, a flow pattern map for single-side heated narrow rectangular channel has been developed and then compared with the exiting maps and flow transition criteria.

Issue Section:
Nuclear Power
Keywords:
boiling, channel flow, heat transfer, photography, two-phase flow, flow patterns, visualization, narrow rectangular channel, single-side heated
Topics:
Flow (Dynamics), Water, Two-phase flow, Photography
1.
Mishima
,
K.
,
Hibiki
,
T.
, and
Nishihara
,
H.
, 1993, “
Some Characteristics of Gas-Liquid Flow in Narrow Rectangular Ducts
,”
Int. J. Multiphase Flow
0301-9322,
19
, pp.
115
–
124
.
Crossref
Search ADS
 
2.
Wilmarth
,
T.
, and
Ishii
,
M.
, 1994, “
Two-Phase Flow Regimes in Narrow Rectangular Vertical and Horizontal Channels
,”
Int. J. Heat Mass Transfer
0017-9310,
37
, pp.
1749
–
1758
.
Crossref
Search ADS
 
3.
Mishima
,
K.
, and
Ishii
,
M.
, 1984, “
Flow Regime Transition Criteria for Upward Two-Phase Flow in Vertical Tubes
,”
Int. J. Heat Mass Transfer
0017-9310,
27
(
5
), pp.
723
–
737
(J).
Crossref
Search ADS
 
4.
Xu
,
J.
, 1999, “
Experimental Study on Gas-Liquid Two-Phase Flow Regimes in Rectangular Channels With Mini Gaps
,”
Int. J. Heat Fluid Flow
0142-727X,
20
, pp.
422
–
428
.
Crossref
Search ADS
 
5.
Taitel
,
Y.
,
Bornea
,
D.
, and
Dukler
,
A. E.
, 1980, “
Modelling Flow Pattern Transitions for Steady Upward Gas-Liquid Flow in Vertical Tubes
,”
AIChE J.
0001-1541,
26
, pp.
345
–
354
.
Crossref
Search ADS
 
6.
Hibiki
,
T.
, and
Mishima
,
K.
, 2001, “
Flow Regime Transition Criteria for Upward Two-Phase Flow in Vertical Narrow Rectangular Channels
,”
Nucl. Eng. Des.
0029-5493,
203
, pp.
117
–
131
.
Crossref
Search ADS
 
7.
Hosler
,
E. R.
, 1968, “
Flow Patterns in High Pressure Two-Phase (Steam-Water) Flow With Heat Addition
,”
AIChE Symp. Ser.
0065-8812,
64
, pp.
54
–
66
.
8.
Ishii
,
M.
, 1977, “
One-Dimensional Drift-Flux Model and Constitutive Equations for Relative Motion Between Phases in Various Two-Phase Flow Regimes
,” ANL Report No. 77-47.
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 by American Society of Mechanical Engineers
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