The distributions of the mass transfer coefficient in horizontal 90 deg bends were measured under a range of two phase annular flow conditions. A dissolving wall technique at a high Schmidt number (Sc = 1280) is used for the measurements. The maximum mass transfer occurred on the centerline of the bend outer wall at an angle of approximately 50 deg from the bend inlet under all tested conditions. The area of maximum mass transfer rate was found to span approximately 30 deg in the circumferential direction. A second region of enhanced mass transfer occurred on the latter part of the bend with a local maximum occurring slightly off the bend centerline in some cases. Changing the air and water superficial velocities (Jv = 22–30 m/s, JL = 0.17–0.41 m/s) showed that the air velocity had a larger effect on the mass transfer rates than the water velocity; however, the effect of the water velocity on the mass transfer was not insignificant.

References

References
1.
Poulson
,
B.
,
1999
, “
Complexities in Predicting Erosion Corrosion
,”
Wear
,
233–235
. pp.
497
504
.10.1016/S0043-1648(99)00235-5
2.
Kim
,
S.
,
Park
,
J. H.
,
Kojasoy
,
G.
,
Kelly
,
J. M.
, and
Marshall
,
S. O.
,
2007
, “
Geometric Effects of 90-Degree Elbow in the Development of Interfacial Structures in Horizontal Bubbly Flow
,”
Nucl. Eng. Des.
,
237
, pp.
2105
2121
.10.1016/j.nucengdes.2007.02.007
3.
Spedding
,
P. L.
,
Benard
,
E.
, and
Crawford
,
N. M.
,
2008
, “
Fluid Flow Through a Vertical to Horizontal 90 deg Elbow Bend III Phase Flow
,”
Exp. Therm. Fluid Sci.
,
32
, pp.
827
843
.10.1016/j.expthermflusci.2007.10.002
4.
Crawford
,
N. M.
,
Cunningham
,
G.
, and
Spedding
,
P. L.
,
1974
, “
Prediction of Pressure Drop for Turbulent Fluid Flow in 90 Degree Bends
,”
Proc. Inst. Mech. Eng.
,
217E
, pp.
1
3
.10.1243/095440803322328827
5.
Spedding
,
P. L.
,
Benard
,
E.
, and
McNally
,
G. M.
,
2004
, “
Fluid Flow Through 90 Degree Bends
,”
Dev. Chem. Eng. Miner. Process.
,
12
, pp.
107
128
.10.1002/apj.5500120109
6.
Supa-Amornkul
,
S.
,
Steward
F. R.
, and
Lister
D. H.
,
2005
, “
Modeling Two-Phase Flow in Pipe Bends
,”
J. Pressure Vessel Technol.
,
127
, pp.
204
209
.10.1115/1.1904063
7.
Maddock
,
C.
,
Lacey
,
P. M. C.
, and
Patrick
,
M. A.
,
1974
, “
The Structure of Two Phase Flow in a Curved Pipe
,”
Int. J. Quantum Chem., Quantum Chem. Symp.
,
38
, pp.
1
12
.
8.
Anderson
,
G. H.
, and
Hills
,
P. D.
,
1974
, “
Two-Phase Annular Flow in Tube Bends
,”
Presented at Symposium Multiphase Flow Systems, Institute Chemical Engineers Symposium Ser. No. 38
, University of Strathclyde, Paper J1.
9.
Usui
,
K.
,
Aoki
,
S.
, and
Inoue
,
A.
,
1980
, “
Flow Behavior and Pressure Drop of Two Phase Flow in C-Shaped Bend in Vertical Plane, Upward Flow (I)
,”
J. Nucl. Sci. Technol.
,
17
(
12
), pp.
875
887
.10.1080/18811248.1980.9732670
10.
Poulson
,
B.
,
1993
, “
Advances in Understanding Hydrodynamic Effects on Corrosion
,”
Corros. Sci.
,
35
(
1–4
), pp.
655
665
.10.1016/0010-938X(93)90201-Q
11.
Poulson
,
B.
,
1991
, “
Measuring and Modeling Mass Transfer at Bends in Annular Two Phase Flow
,”
J. Chem. Eng. Sci.
,
64
(
4
), pp.
1069
1082
.10.1016/0009-2509(91)85100-C
12.
Pecherkin
,
N.
, and
Chekhovich
,
V.
,
2011
, “
Mass Transfer in Two-Phase Gas-Liquid Flow in a Tube and in Channels of Complex Configuration
,”
Mass Transfer in Multiphase Systems and it Applictaions
, Vol.
155
,
Mohamed El-Amin
, ed., InTech, Rijeka, Croatia, Chap. VIII.
13.
Da Silva Lima
,
R. J.
, and
Thome
,
J. R.
,
2012
, “
Two-Phase Flow Patterns in U-Bends and Their Contiguous Straight Tubes for Different Orientations, Tube, and Bend Diameters
,”
HVAC&R Res.
,
35
, pp.
1439
1454
.10.1016/j.ijrefrig.2012.02.002
14.
Villien
,
B.
,
Zheng
,
Y.
, and
Lister
,
D. H.
,
2001
, “
The Scalloping Phenomenon and Its Significance in Flow Assisted-Corrosion
,”
Twenty Sixth Annual CNS-CNA Student Conference
.
15.
Wilkin
,
S. J.
,
Oates
,
H. S.
, and
Coney
,
M.
,
1983
,
Mass Transfer on Straight Pipes and 90 deg Bends Measured by the Dissolution of Plaster
, 1st ed.,
Central Electricity Research Laboratories
, Surrey, UK.
16.
Robinson
,
R. A.
, and
Stokes
,
R. H.
,
1968
,
Electrolyte Solutions
, 2nd ed.,
Butterworths
,
London
.
17.
Coleman
,
H. W.
, and
Steele
,
W. G.
,
1999
,
Experimentation and Uncertainty Analysis for Engineers
, 2nd ed.,
John Wiley & Sons
,
New York
.
18.
Chisholm
,
D.
,
1967
, “
A Theoretical Basis for the Lockhart Martinelli Correlation for Two-Phase Flow
,”
Int. J. Heat Mass Transfer
,
10
, pp.
1767
1778
.10.1016/0017-9310(67)90047-6
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