This paper proposed a theoretical model involving in conditions of bubble departure point and lift-off point, the principle and estimating method of individual forces have been proposed as well. The forces acted on growing bubble are, namely, surface tension force Fs, growth force of bubbles Fdu, shear lift force FsL, drag force of flow Fqs, hydrodynamic pressure force Fh, contact pressure force Fcp, buoyancy force Fb and bubble acceleration inertia force d(mvc)/dt as well. Horizontal and vertical momentum equations are presented according to forces balance of bubble, meanwhile, the estimating method of lean angle of bubble before departure also has been discussed.

1.
Thorncroft
GE
,
Klausner
JF
,
Mei
R.
,
An experimental investigation of bubble growth and detachment in vertical upflow and downflow boiling, Int
.
J. Heat Mass Transfer
1998
;
41
(
23)
:
3857
3871
2.
Bonjour
J
,
Clausse
M
,
Lallemand
M.
,
Experimental study of the coalescence phenomenon during nucleate pool boiling
,
Experimental Thermal and Fluid Science
,
2000
,
20
:
180
187
3.
Chen
T
,
Chung
JN
.
Coalescence of bubbles in nucleate boiling on microheaters
.
Int J Heat Mass Transfer
,
2002
,
45
:
2329
2341
4.
Chai
LH
,
Peng
XF
,
Wang
BX
, et al.
Interfacial behavior of growing bubbles in concentration boundary layer
.
International Journal of Heat and Mass Transfer
,
1998
,
41
:
3529
3535
5.
Klausner
JF
,
Mei
R
,
Bernhatd
DM
,
Zeng
LZ
.
Vapor bubble departure in forced convection boiling
.
Int. J. Heat Mass Transfer
.
1993
;
36
(
3)
,
651
662
,
6.
Zeng
LZ
,
Klausner
JF
,
Mei
R.
A unified model for the prediction of bubble detachment diameters in boiling systems—1. Pool Boiling
.
Int J Heat and Mass Transfer
,
1993
;
36
(
9)
,
2261
2270
7.
Zeng
LZ
,
Klausner
JF
,
Mei
R.
A unified model for the prediction of bubble detachment diameters in boiling systems—II. Flow Boiling
.
Int J Heat and Mass Transfer
,
1993
;
36
(
9)
,
2271
2279
8.
Van Helden
WGJ
,
Van Der Geld
CWM
,
Boot
PGM
.
Forces on bubble growing and detaching in flow along a vertical wall
.
Int J Heat Mass Transfer
,
1995
,
38
(
11)
:
2075
2088
9.
Tong LS, Tang YS, Boiling Heat Transfer and Two-phase Flow, Washington, D.C.: Taylor & Francis, 1997: 7–60
10.
van Stralen S, Cole R. Boling Phenomena. Library of Congress Cataloging in Publication Data, 1979, pp. 204–218
11.
Kurose
R
,
Misumi
R
,
Komori
S
,
Drag and lift forces acting on a spherical bubble in a linear shear flow
,
Int. J. Multiphase Flow
,
2001
;
21
:
1247
1258
12.
Reichardt
H.
1951
Vollstandige Darstellung der turbulenten Geschwindigkeits-verteilung in glatten Leitungen
.
Z. Math. Mech.
31
,
11
11
.
13.
Situ
R
,
Mi
Y
,
Ishii
M
,
Photographic study of bubble behaviors in forced convection subcooled boiling
,
Int J Heat Mass Transfer
,
2004
,
47
:
3659
3667
14.
Chen
T
,
Klausner
JF
,
Chung
JN
,
Subcooled boiling heat transfer and dryout on a constant temperature microheater
.
Int J of heat and Fluid Flow
2004
;
25
:
274
287
This content is only available via PDF.
You do not currently have access to this content.