Multiphase flow phenomena in single micro and minichannels have been widely studied. Characteristics of two-phase flow through a large array of microchannels are investigated here. An air–water mixture is used to represent the two phases flowing through a microchannel array representative of those employed in practical applications. Flow distribution of the air and water flow across 52 parallel microchannels of 0.4 mm hydraulic diameter is visually investigated using high-speed photography. Two microchannel configurations are studied and compared, with mixing features incorporated into the second configuration. Slug and annular flow regimes are observed in the channels. Void fractions and interfacial areas are calculated for each channel from these observations. The flow distribution is tracked at various lengths along the microchannel array sheets. Statistical distributions of void fraction and interfacial area along the microchannel array are measured. The design with mixing features yields improved flow distribution. Void fraction and interfacial area change along the length of the second configuration, indicating a change in fluid distribution among the channels. The void fraction and interfacial area results are used to predict the performance of different microchannel array configurations for heat and mass transfer applications. Results from this study can help inform the design of compact thermal-fluid energy systems.

References

References
1.
Ozawa
,
M.
,
Akagawa
,
K.
, and
Sakaguchi
,
T.
,
1989
, “
Flow Instabilities in Parallel-Channel Flow Systems of Gas-Liquid Two-Phase Mixtures
,”
Int. J. Multiphase Flow.
,
15
(
4
), pp.
639
657
.
2.
Tshuva
,
M.
,
Barnea
,
D.
, and
Taitel
,
Y.
,
1999
, “
Two-Phase Flow in Inclined Parallel Pipes
,”
Int. J. Multiphase Flow.
,
25
(
6–7
), pp.
1491
1503
.
3.
Kandlikar
,
S. G.
, and
Balasubramanian
,
P.
,
2005
, “
An Experimental Study on the Effect of Gravitational Orientation on Flow Boiling of Water in 1054 × 197 μm Parallel Minichannels
,”
ASME J. Heat Transfer.
,
127
(
8
), pp. 820–829.
4.
Balasubramanian
,
P.
, and
Kandlikar
,
S. G.
,
2005
, “
Experimental Study of Flow Patterns, Pressure Drop, and Flow Instabilities in Parallel Rectangular Minichannels
,”
Heat Transfer Eng.
,
26
(
3
), pp.
20
27
.
5.
Rong
,
X.
,
Kawaji
,
M.
, and
Burgers
,
J. G.
,
1996
,
Gas-Liquid and Flow Rate Distributions in Single End Tank Evaporator Plates
,
SAE International
, Detroit, MI.
6.
Kandlikar
,
S. G.
,
Steinke
,
M.
,
Tian
,
S.
, and
Campbell
,
L. A.
,
2001
, “
High-Speed Photographic Observation of Flow Boiling of Water in Parallel Mini-Channels
,”
35th National Heat Transfer Conference
, Anaheim, CA, June 10–12.
7.
Hetsroni
,
G.
,
Mosyak
,
A.
,
Segal
,
Z.
, and
Pogrebnyak
,
E.
,
2003
, “
Two-Phase Flow Patterns in Parallel Micro-Channels
,”
Int. J. Multiphase Flow.
,
29
(
3
), pp.
341
360
.
8.
Peles
,
Y.
,
2003
, “
Two-Phase Boiling Flow in Microchannels: Instabilities Issues and Flow Regime Mapping
,”
ASME
Paper No. ICMM2003-1069.
9.
Kim
,
Y. J.
,
Joshi
,
Y. K.
,
Fedorov
,
A. G.
,
Lee
,
Y.-J.
, and
Lim
,
S.-K.
,
2010
, “
Thermal Characterization of Interlayer Microfluidic Cooling of Three-Dimensional Integrated Circuits With Nonuniform Heat Flux
,”
ASME J. Heat Transfer.
,
132
(
4
), p.
041009
.
10.
Yoon
,
S. H.
,
Saneie
,
N.
, and
Kim
,
Y. J.
,
2014
, “
Two-Phase Flow Maldistribution in Minichannel Heat-Sinks Under Non-Uniform Heating
,”
Int. J. Heat Mass Transfer.
,
78
, pp.
527
537
.
11.
Vist
,
S.
, and
Pettersen
,
J.
,
2004
, “
Two-Phase Flow Distribution in Compact Heat Exchanger Manifolds
,”
Exp. Therm. Fluid Sci.
,
28
(
2–3
), pp.
209
215
.
12.
Marchitto
,
A.
,
Devia
,
F.
,
Fossa
,
M.
,
Guglielmini
,
G.
, and
Schenone
,
C.
,
2008
, “
Experiments on Two-Phase Flow Distribution Inside Parallel Channels of Compact Heat Exchangers
,”
Int. J. Multiphase Flow.
,
34
(
2
), pp.
128
144
.
13.
Fei
,
P.
, and
Hrnjak
,
P.
,
2004
, “
Adiabatic Developing Two-Phase Refrigerant Flow in Manifolds of Heat Exchangers
,” University of Illinois at Urbana-Champaign, Urbana, IL, Report No. 225.
14.
Ahmad
,
M.
,
Berthoud
,
G.
, and
Mercier
,
P.
,
2009
, “
General Characteristics of Two-Phase Flow Distribution in a Compact Heat Exchanger
,”
Int. J. Heat Mass Transfer.
,
52
(
1–2
), pp.
442
450
.
15.
Mahvi
,
A. J.
, and
Garimella
,
S.
,
2017
, “
Visualization of Flow Distribution in Rectangular and Triangular Header Geometries
,”
Int. J. Refrig.
,
76
(
Suppl. C
), pp.
170
183
.
16.
Rong
,
X.
,
Kawaji
,
M.
, and
Burgers
,
J.
,
1995
, “
Two-Phase Header Flow Distribution in a Stacked Plate Heat Exchanger
,” Gas-Liq. Flows,
225
, pp. 115–122.
17.
Nagavarapu
,
A. K.
, and
Garimella
,
S.
,
2011
, “
Design of Microscale Heat and Mass Exchangers for Absorption Space Conditioning Applications
,”
ASME J. Therm. Sci. Eng. Appl.
,
3
(
2
), p.
021005
.
18.
Determan
,
M. D.
, and
Garimella
,
S.
,
2012
, “
Design, Fabrication, and Experimental Demonstration of a Microscale Monolithic Modular Absorption Heat Pump
,”
Appl. Therm. Eng.
,
47
(
0
), pp.
119
125
.
19.
Mandhane
,
J. M.
,
Gregory
,
G. A.
, and
Aziz
,
K.
,
1974
, “
A Flow Pattern Map for Gas—Liquid Flow in Horizontal Pipes
,”
Int. J. Multiphase Flow.
,
1
(
4
), pp.
537
553
.
20.
Mehdizadeh
,
A.
,
Sherif
,
S. A.
, and
Lear
,
W. E.
,
2009
, “
CFD Modeling of Two-Phase Gas-Liquid Slug Flow Using Vof Method in Microchannels
,”
ASME
Paper No. FEDSM2009-78438.
21.
Winkler
,
J.
,
Killion
,
J.
, and
Garimella
,
S.
,
2012
, “
Void Fractions for Condensing Refrigerant Flow in Small Channels. Part Ii: Void Fraction Measurement and Modeling
,”
Int. J. Refrig.
,
35
(
2
), pp.
246
262
.
22.
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
.
23.
Keinath
,
B.
, and
Garimella
,
S.
,
2016
, “
Measurement and Modeling of Void Fraction in High-Pressure Condensing Flows Through Microchannels
,”
Heat Transfer Eng.
,
37
(
13–14
), pp.
1172
1180
.
24.
Garimella
,
S.
,
Agarwal
,
A.
, and
Killion
,
J. D.
,
2005
, “
Condensation Pressure Drop in Circular Microchannels
,”
Heat Transfer Eng.
,
26
(
3
), pp.
28
35
.
You do not currently have access to this content.