A physical and mathematical model of the evaporating thick liquid film, attached to the liquid-vapor meniscus in a circular micropore, has been developed. The liquid flow has been coupled with the vapor flow along the liquid-vapor interface. The model includes quasi-one-dimensional compressible steady-state momentum conservation for the vapor and also a simplified description of the microfilm at the end of the thick film. The numerical results, obtained for water, demonstrate that formation of extended thick liquid films in micropores can take place due to high-velocity vapor flow under high rates of vaporization. The model has also predicted that the available capillary pressure significantly changes with the wall-vapor superheat and other operational conditions.

Issue Section:
Evaporation
Keywords:
Evaporation, Phase-Change Phenomena, Thin Film Flow
Topics:
Evaporation, Flow (Dynamics), Heat, Thick films
1.
Bankston
 
C. A.
, and
Smith
 
H. J.
,
1973
, “
Vapor Flow in Cylindrical Heat Pipes
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
95
, pp.
371
–
376
.
2.
Belonogov, A. G., and Kiseev, V. M., 1995, “Evaporation Problems in Wetting Film Theory,” Proceedings of the 30th National Heat Transfer Conference, Portland, OR AIChE Symposium Series, Vol. 91, pp. 333–336.
3.
Bowman, W. J., and Hitchcock, J., 1988, “Transient, Compressible Heat-Pipe Vapor Dynamics,” Proceedings of the 25th ASME National Heat Transfer Conference, Houston, Texas, pp. 329–337.
4.
Carey, V. P., 1992, Liquid-Vapor Phase-Change Phenomena: An Introduction to the Thermophysics of Vaporization and Condensation Processes in Heat Transfer Equipment, Hemisphere, New York.
5.
Faghri, A., 1995, Heat Pipe Science and Technology, Taylor & Francis, Washington, DC.
6.
Gauglitz
 
P. A.
, and
Radke
 
C. J.
,
1986
, “
The Role of Wettability in the Breakup of Liquid Films Inside Constricted Capillaries
,”
Thin Liquid Film Phenomena, AIChE Symposium Series
, Vol.
82
, No.
252
, pp.
50
–
63
.
7.
He, Q., and Hallinan, K. P., 1994, “Thermocapillary Effects on the Evaporating Extended Meniscus,” Proc. of the 1994 Int. Mechanical Engineering Congress and Exposition, Chicago, HTD-Vol. 290, pp. 71–82.
8.
Holm
 
F. W.
, and
Goplen
 
S. P.
,
1979
, “
Heat Transfer in the Meniscus Thin-Film Transition Region
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
101
, No.
3
, pp.
543
–
547
.
9.
Jang
 
J. H.
, and
Faghri
 
A.
,
1991
, “
Analysis of the One-Dimensional Transient Compressible Vapor Flow in Heat Pipes
,”
Int. J. Heat and Mass Transfer
, Vol.
34
, pp.
2029
–
2037
.
10.
Khrustalev
 
D.
, and
Faghri
 
A.
,
1995
a, “
Heat Transfer During Evaporation on Capillary-Grooved Structures of Heat Pipes
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
117
, No.
3
, pp.
740
–
747
.
11.
Khrustalev
 
D.
, and
Faghri
 
A.
,
1995
b, “
Heat Transfer in the Inverted Meniscus Type Evaporator at High Heat Fluxes
,”
International Journal of Heat and Mass Transfer
, Vol.
38
, No.
16
, pp.
3091
–
3101
.
12.
Khrustalev
 
D.
, and
Faghri
 
A.
,
1996
, “
Fluid Flow Effects in Evaporation from Liquid/Vapor Meniscus
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
118
, pp.
725
–
730
.
13.
Potash
 
M.
, and
Wayner
 
P. C.
,
1972
, “
Evaporation from a Two-Dimensional Extended Meniscus
,”
Int. J. Heat Mass Transfer
, Vol.
15
, pp.
1851
–
1863
.
14.
Solov’ev, S. L., and Kovalev, S. A., 1984, “Mechanism of Evaporation of a Liquid from a Porous Surface,” Proc. 5th Int. Heat Pipe Conf., Tsukuba, Japan, Preprints Vol. II, pp. 77–82.
15.
Stephan
 
P. C.
, and
Busse
 
C. A.
,
1992
, “
Analysis of the Heat Transfer Coefficient of Grooved Heat Pipe Evaporator Walls
,”
Int. J. Heat Mass Transfer
, Vol.
35
, No.
2
, pp.
383
–
391
.
16.
Swanson
 
L. W.
, and
Herdt
 
G. C.
,
1992
, “
Model of the Evaporating Meniscus in a Capillary Tube
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
114
, May, pp.
434
–
441
.
17.
Volintine
 
B. G.
, and
Wayner
 
P. C.
,
1986
, “
Fluid Flow and Evaporation in an Ultra-Thin Film of a Binary Mixture
,”
Thin Liquid Film Phenomena, AIChE Symposium Series
, Vol.
82
, No.
252
, pp.
157
–
166
.
18.
Wayner
 
P. C.
,
Tung
 
C. Y.
,
Tirumala
 
M.
, and
Yang
 
J. H.
,
1985
, “
Experimental Study of Evaporation in the Contact Line Region of a Thin Film of Hexane
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
107
, pp.
182
–
189
.
19.
Xu
 
X.
, and
Carey
 
V. P.
,
1990
, “
Film Evaporation from a Micro-Grooved Surface—An Approximate Heat Transfer Model and Its Comparison with Experimental Data
,”
J. Thermophysics and Heat Transfer
, Vol.
4
, No.
4
, pp.
512
–
520
.
This content is only available via PDF.
Copyright © 1997
 by The American Society of Mechanical Engineers
You do not currently have access to this content.