In this study, heat transfer and fluid flow characteristics of nonboiling two-phase flow in microchannels were experimentally investigated. The effects of channel diameter (140, 222, 334, and 506 μm) on the Nusselt number and the pressure drop were considered. Air and water were used as the test fluids. Results were presented for the Nusselt number and the pressure drop over a wide range of gas superficial velocity (1.24–40.1 m/s), liquid superficial velocity (0.57–2.13 m/s), and wall heat flux (0.34–0.95 MW/m2). The results showed that the Nusselt number increased with increasing gas flow rate for the large channels of 506 and 334 μm, while the Nusselt number decreased with increasing gas flow for the small channels of 222 and 140 μm. Based on these experimental results, a new correlation for the forced convection Nusselt number was developed. In addition, the two-phase friction multiplier is shown to decrease as channel diameter decreases due to the influence of viscous and surface tension forces.

References

References
1.
Schilder
,
B.
,
Man
,
S. Y. C.
,
Kasagi
,
N.
,
Hardt
,
S.
, and
Stephan
,
P.
, 2010, “
Flow Visualization and Local Measurement of Forced Convection Heat Transfer in a Microtube
,”
ASME J. Heat Transfer
,
132
,
031702
.
2.
Morini
,
G. L.
, 2004, “
Single-Phase Convective Heat Transfer in Microchannels: A Review of Experimental Results
,”
Int. J. Therm. Sci.
,
43
(
7
), pp.
631
651
.
3.
Lelea
,
D.
,
Nishio
,
S.
, and
Takano
,
K.
, 2004, “
The Experimental Research on Microtube Heat Transfer and Fluid Flow of Distilled Water
,”
Int. J. Heat Mass Transfer
,
47
(
12–13
), pp.
2817
2830
.
4.
Celata
,
G. P.
,
Cumo
,
M.
,
Mariani
,
A.
,
Nariai
,
H.
, and
Inasaka
,
F.
, 1993, “
Influence of Channel Diameter on Subcooled Flow Boiling Burnout at High Heat Fluxes
,”
Int. J. Heat Mass Transfer
,
36
(
13
), pp.
3407
3410
.
5.
Kandlikar
,
S. G.
,
Joshi
,
S.
, and
Tian
,
S.
, 2003, “
Effect of Surface Roughness on Heat Transfer and Fluid Flow Characteristics at Low Reynolds Numbers in Small Diameter Tubes
,”
Heat Transfer Eng.
,
24
(
3
), pp.
4
16
.
6.
Serizawa
,
A.
,
Feng
,
Z.
, and
Kawara
,
Z.
, 2002, “
Two-Phase Flow in Microchannels
,”
Exp. Therm. Fluid Sci.
,
26
(
6–7
), pp.
703
714
.
7.
Chung
,
P. M. Y.
, and
Kawaji
,
M.
, 2004, “
The Effect of Channel Diameter on Adiabatic Two-Phase Flow Characteristics in Microchannels
,”
Int. J. Multiphase Flow
,
30
(
7–8
), pp.
735
761
.
8.
Saisorn
,
S.
, and
Wongwises
,
S.
, 2010, “
The Effects of Channel Diameter on Flow Pattern, Void Fraction and Pressure Drop of Two-Phase Air-Water Flow in Circular Micro-Channels
,”
Exp. Therm. Fluid Sci.
,
34
(
4
), pp.
454
462
.
9.
Triplett
,
K. A.
,
Ghiaasiaan
,
S. M.
,
Abdel-Khalik
,
S. I.
, and
Sadowski
,
D. L.
, 1999, “
Gas-Liquid Twophase Flow in Microchannels Part I: Two-Phase Flow Patterns
,”
Int. J. Multiphase Flow
,
25
, pp.
377
394
.
10.
Triplett
,
K. A.
,
Ghiaasiaan
,
S. M.
,
Abdel-Khalik
,
S. I.
,
Lemouel
,
A.
, and
Mccord
,
B. N.
, 1999, “
Gas-Liquid Twophase Flow in Microchannels Part II: Void Fraction and Pressure Drop
,”
Int. J. Multiphase Flow
,
25
, pp.
395
410
.
11.
Venkatesan
,
M.
,
Aravinthan
,
M.
,
Das
,
S. K.
, and
Balakrishnan
,
A. R
., 2010, “
Fluid Flow and Boiling Heat Transfer in Mini Channels
,”
ASME 14th International Heat Transfer Conference
, Vol.
6
.
12.
Talimi
,
V.
, and
Muzychka
,
Y. S.
, 2010, “
Numerical Studies on Non-Boiling Two-Phase Flows in Microtubes and Microchannels: A Review
,”
ASME 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B
.
13.
Bao
,
Z. Y.
,
Fletcher
,
D. F.
, and
Haynes
,
B. S.
, 2000, “
An Experimental Study of Gas-Liquid Flow in a Narrow Conduit
,”
Int. J. Heat Mass Transfer
,
43
(
13
), pp.
2313
2324
.
14.
Hetsroni
,
G.
,
Mosyak
,
A.
,
Pogrebnyak
,
E.
, and
Segal
,
Z.
, 2009, “
Heat Transfer of Gas-Liquid Mixture in Micro-Channel Heat Sink
,”
Int. J. Heat Mass Transfer
,
52
(
17–18
), pp.
3963
3971
.
15.
Lee
,
C. Y.
, and
Lee
,
S. Y.
, 2008, “
Pressure Drop of Two-Phase Dry-Plug Flow in Round Mini-Channels: Influence of Surface Wettability
,”
Exp. Therm. Fluid Sci.
,
32
(
8
), pp.
1716
1722
.
16.
Maranzana
,
G.
,
Perry
,
I.
, and
Maillet
,
D.
, 2004, “
Mini- and Micro-Channels: Influence of Axial Conduction in the Walls
,”
Int. J. Heat Mass Transfer
,
47
(
17–18
), pp.
3993
4004
.
17.
Ghiaasiaan
,
S. M.
, 2008,
Two-Phase Flow, Boiling, and Condensation in Conventional and Miniature Systems
,
Cambridge University
,
Cambridge, England
.
18.
Kline
,
S. J.
, and
McClintock
,
F. A.
, 1953, “
Describing Uncertainties in Single Sample Experiments
,”
Mech. Eng.
,
75
(
1
), pp.
3
8
.
19.
Lockhart
,
R. W.
, and
Martinelli
,
R. C.
, 1949, “
Proposed Correlation of Data for Isothermal Two-Phase, Two-Component Flow in Pipes
,”
Chem. Eng. Prog.
,
45
, pp.
39
48
.
20.
Chisholm
,
D.
, and
Laird
,
A. D. K.
, 1958, “
Two-Phase Flow in Rough Tubes
,”
Trans. ASME
,
80
, pp.
276
286
.
21.
Mishima
,
K.
, and
Hibiki
,
T.
, 1996, “
Some Characteristics of Air-Water Two-Phase Flow in Small Diameter Vertical Tubes
,”
Int. J. Multiphase Flow
,
22
, pp.
703
712
.
22.
Lee
,
H. J.
, and
Lee
,
S. Y.
, 2001, “
Pressure Drop Correlations for Two-Phase Flow Within Horizontal Rectangular Channels With Small Height
,”
Int. J. Multiphase Flow
,
27
, pp.
783
796
.
23.
Ali
,
M. I.
,
Sadatomi
,
M.
, and
Kawaji
,
M.
, 1993, “
Two-Phase Flow in Narrow Channels between Two Flat Plates
,”
Can. J. Chem. Eng.
,
71
, pp.
657
666
.
24.
Kandlikar
,
S. G.
, and
Grande
,
W. J.
, 2003, “
Evolution of Microchannel Flow Passages-Thermohydraulic Performance and Fabrication Technology
,”
Heat Transfer Eng.
,
24
, pp.
3
17
.
25.
Kawahara
,
A.
,
Chung
,
P. M. Y.
, and
Kawaji
,
M.
, 2002, “
Investigation of Two-Phase Flow Pattern, Void Fraction and Pressure Drop in a Microchannel
,”
Int. J. Multiphase Flow
,
28
(
9
), pp.
1411
1435
.
26.
Chen
,
J. C.
, 1966, “
Correlation for Boiling Heat Transfer to Saturated Fluids in Convective Flow
,”
Ind. Eng. Chem. Res.
,
5
, pp.
322
329
.
27.
Steiner
,
D.
, and
Taborek
,
J.
1992, “
Flow Boiling Heat Transfer in Vertical Tubes Correlated by an Asymptotic Model
,”
Heat Transfer Eng.
,
13
, pp.
43
89
.
28.
Gungor
,
K. E.
, and
Winterton
,
R. H. S.
, 1986, “
A General Correlation for Flow Boiling in Tubes and Annuli
,”
Int. J. Heat Mass Transfer
,
29
, pp.
351
358
.
29.
Liu
,
Z.
, and
Winterton
,
R. H. S.
, 1991, “
A General Correlation for Saturated and Subcooled Flow Boiling in Tubes and Annuli, Based on a Nucleate Pool Boiling Equation
,”
Int. J. Heat Mass Transfer
,
34
, pp.
2759
2766
.
30.
Kandlikar
,
S. G.
, 1990, “
A General Correlation for Two-Phase Flow Boiling Heat Transfer Coefficients Inside Horizontal and Vertical Tubes
,”
ASME J. Heat Transfer
,
112
, pp.
219
228
.
You do not currently have access to this content.