Abstract
As an efficient heat and mass transfer technology, falling film evaporation has attracted more and more scholars' attention. In this paper, a falling film evaporation platform was established to discuss the mechanism of two-phase flow in narrow channels. The width of the channel varied from 0.5 to 2.0 mm. We focused on the relationship between heat transfer characteristics with flow patterns, channel width, and pressure loss. Three kinds of flow patterns were observed: bubble flow, restricted bubble flow, and dry area. In channels with the same width, the initial heat flux of subcooled evaporation increased linearly with the growth of flow rate. But at the same flow rate, the initial heat flux of subcooled evaporation decreased when the channel width became larger. The heat transfer coefficient on the wall was influenced by the bubble generation frequency and bubble separation diameter. Higher bubble generation frequency led to smaller bubble separation diameter. Through mathematical analysis, it was found that the heat transfer coefficient changed with the channel size. And a boundary was observed between the strengthening and weakening status. The comparison of theoretical and experimental values showed good agreement.
Issue Section:
Evaporation, Boiling, and Condensation
References
1.
Ribatski
,
G.
, and
Jacobi
,
A. M.
, 2005
, “
Falling-Film Evaporation on Horizontal Tubes-A Critical Review
,” Int. J. Refrig.
,
28
(5
), pp. 635
–653
.10.1016/j.ijrefrig.2004.12.0022.
Krupiczka
,
R.
,
Rotkegel
,
A.
, and
Ziobrowski
,
Z.
, 2002
, “
Heat Transfer to Evaporating Liquid Films Within a Vertical Tube
,” Chem. Eng. Process.
,
41
(1
), pp. 23
–28
.10.1016/S0255-2701(00)00158-63.
Bowers
,
M. B.
, and
Mudawar
,
I.
, 1994
, “
High Flux Boiling in Low Flow Rate, Low Pressure Drop Mini-Channel and Micro-Channel Heat Sinks
,” Int. J. Heat Mass Transfer
,
37
(2
), pp. 321
–332
.10.1016/0017-9310(94)90103-14.
Klausner
,
J. F.
,
Mei
,
R.
,
Bernhard
,
D. M.
, and
Zeng
,
L. Z.
, 1993
, “
Vapor Bubble Departure in Forced Convection Boiling
,” Int. J. Heat Mass Transfer
,
36
(3
), pp. 651
–662
.10.1016/0017-9310(93)80041-R5.
Ishibashi
,
E.
, and
Nishikawa
,
K.
, 1969
, “
Saturated Boiling Heat Transfer in Narrow Spaces
,” Int. J. Heat Mass Transfer
,
12
(8
), pp. 863
–894
.10.1016/0017-9310(69)90153-76.
Candan
,
A.
,
Markal
,
B.
,
Aydin
,
O.
, and
Avci
,
M.
, 2018
, “
Saturated Flow Boiling Characteristics in Single Rectangular Mini-Channels: Effect of Aspect Ratio
,” Exp. Heat Transfer
,
31
(6
), pp. 531
–551
.10.1080/08916152.2018.14633057.
Karayiannis
,
T. G.
, and
Mahmoud
,
M. M.
, 2017
, “
Flow Boiling in Micro Channels: Fundamentals and Applications
,” Appl. Thermal Eng.
,
115
, pp. 1372
–1397
.10.1016/j.applthermaleng.2016.08.0638.
Wambsganss
,
M. W.
,
France
,
D. M.
,
Jendrzejczyk
,
J. A.
, and
Tran
,
T. N.
, 1993
, “
Boiling Heat Transfer in a Small Diameter Tube
,” ASME J. Heat Transfer-Trans. ASME
,
115
(4
), pp. 963
–972
.10.1115/1.29113939.
Krishnan
,
R. A.
,
Balasubramanian
,
K. R.
, and
Suresh
,
S.
, 2018
, “
Experimental Investigation of the Effect of Heat Sink Orientation on Sub-Cooled Flow Boiling Performance in a Rectangular Micro Gap Channel
,” Int. J. Heat Mass Transfer
,
120
, pp. 1341
–1357
.10.1016/j.ijheatmasstransfer.2017.12.13310.
Liu, Z. H., Xiong, J. G., and Bao, R., 2007, “Boiling Heat Transfer Characteristics of Nanofluids in a Flat Heat Pipe Evaporator With Micro-grooved Heating Surface,”
Int. J. Multiphase Flow
, 33(12), pp. 1284
–1295
.10.1016/j.ijmultiphaseflow.2007.06.00911.
Liu
,
Z. H.
,
Yi
,
J.
, and
Wang
,
J.
, 2002
, “
Theoretical Study on Evaporation Heat Transfer Characteristics of Falling Film High-Speed Annular Two-Phase Flow in Vertical Tube
,” J. Shanghai Jiaotong Univ.
,
36
, pp. 1479
–1483
.10.16183/j.cnki.jsjtu.2002.10.02312.
De
,
J.
, and
Xin
,
M. D.
, 2003
, “
Heat Transfer Performance of Ethanol Three-Dimensional Inner Micro-Fin Heat Pipe
,” J. Chongqing Univ.
,
26
, pp. 39
–41
.10.11835/j.issn.1000-582X.2003.04.03013.
Wang
,
W. S.
,
Ma
,
Z. Q.
, and
Zhu
,
X. J.
, 2018
, “
Experimental Research on Heat Transfer Characteristics of R113 Falling Film Evaporation in Vertical Tube
,” Fluid Mach.
,
46
, pp. 55
–59
.10.3969/j.issn.1005-0329.2018.06.01214.
Lin
,
S.
,
Kew
,
P. A.
, and
Cornwell
,
K.
, 2001
, “
Flow Boiling of Refrigerant R141B in Small Tubes
,” Chem. Eng. Res.Des.
,
79
(4
), pp. 417
–424
.10.1205/02638760175028234615.
Tullius
,
J. F.
,
Vajtai
,
R.
, and
Bayazitoglu
,
Y.
, 2011
, “
A Review of Cooling in Micro-Channels
,” Heat Transfer Eng.
,
32
(7–8
), pp. 527
–541
.10.1080/01457632.2010.50639016.
Yen
,
T.-H.
,
Shoji
,
M.
,
Takemura
,
F.
,
Suzuki
,
Y.
, and
Kasagi
,
N.
, 2006
, “
Visualization of Convective Boiling Heat Transfer in Single Micro-Channels With Different Shaped Cross-Sections
,” Int. J. Heat Mass Transfer
,
49
(21–22
), pp. 3884
–3894
.10.1016/j.ijheatmasstransfer.2005.12.02417.
Chen
,
D. Q.
,
Pan
,
L. M.
, and
Yuan
,
D. W.
, 2008
, “
Experimental Study on Bubble Growth in Vertical Narrow Channel
,” Nucl. Power Eng.
,
29
(5
), pp. 52
–55
.https://www.cnki.com.cn/Article/CJFDTOTAL-HDLG200805013.htm18.
Kandlikar
,
S. G.
, 1990
, “
A General Correlation for Saturated Two-Phase Flow Boiling Heat Transfer Inside Horizontal and Vertical Tubes
,” ASME J. Heat Transfer-Trans. ASME
,
112
(1
), pp. 219
–228
.10.1115/1.291034819.
Guo
,
L.
,
Zhang
,
S. S.
, and
Cheng
,
L.
, 2011
, “
Nucleate Boiling in Two Types of Vertical Narrow Channels
,” Front. Energy
,
5
(3
), pp. 250
–256
.10.1007/s11708-010-0128-420.
Talebi
,
S.
,
Abbasi
,
F.
, and
Davilu
,
H.
, 2009
, “
A 2D Numerical Simulation of Sub-Cooled Flow Boiling at Low-Pressure and Low-Flow Rates
,” Nucl. Eng. Des.
,
239
(1
), pp. 140
–146
.10.1016/j.nucengdes.2008.09.00721.
Mahmoud
,
M. M.
, and
Karayiannis
,
T. G.
, 2018
, “
Flow Boiling in Mini to Micro Diameter Channels
,” Encyclopedia of Two Phase Heat Transfer and Flow IV
, 1st ed., Vol.
3
,
J. R.
Thome
, eds.,
Lausanne, Switzerland
:
World Scientific
, pp. 233
–301
.22.
Karmakar
,
A.
, and
Acharya
,
S.
, 2021
, “
Numerical Simulation of Falling Film Flow Hydrodynamics Over Round Horizontal Tubes
,” Int. J. Heat Mass Transfer
,
173
, p. 121175
.10.1016/j.ijheatmasstransfer.2021.12117523.
Özdemir
,
M. R.
,
Mahmoud
,
M. M.
, and
Karayiannis
,
T. G.
, 2021
, “
Flow Boiling of Water in a Rectangular Metallic Micro-Channel
,” Heat Transfer Eng.
,
42
(6
), pp. 492
–516
.10.1080/01457632.2019.170739024.
Lin
,
K. T.
,
Shi
,
D.
,
Jog
,
M. A.
, and
Manglik
,
R. M.
, 2020
, “
General Correlations for Laminar Flow Friction Loss and Heat Transfer in Plain Rectangular Plate-Fin Cores
,” ASME J. Heat Transfer-Trans. ASME
,
142
(12
), pp. 121801
–121817
.10.1115/1.404809125.
Manoharan
,
S.
,
Deodhar
,
A.
,
Manglik
,
R. M.
, and
Jog
,
M. A.
, 2019
, “
Computational Modeling of Adiabatic Bubble Growth Dynamics From Submerged Capillary-Tube Orifices in Aqueous Solutions of Surfactants
,” ASME J. Heat Transfer-Trans. ASME
,
141
(5
), pp. 052002
–052021
.10.1115/1.404270026.
Jakob
,
M.
,
Awbery
,
J. H.
, and
Ingersol
,
L. R.
, 1950
, “
Heat Transfer Volume I and a Textbook on Heat
,” Phys. Today
,
3
(6
), pp. 23
–24
.10.1063/1.306690327.
Choi
,
H.
,
Li
,
C.
, and
Peterson
,
G. P.
, 2021
, “
Dynamic Processes of Nanobubbles: Growth, Collapse, and Coalescence
,” ASME J. Heat Transfer-Trans. ASME
,
143
(10
), pp. 102501
–102524
.10.1115/1.4051323Copyright © 2022 by ASME
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