In the present paper, the pressure drop characteristics and flow patterns during downward vertical flow of lube oil-water as well as kerosene-water through a circular glass conduit have been studied. Core-annular flow has been observed to be the dominant flow pattern and it gives rise to slug flow with increase of water and/or decrease of oil velocity. However, there are subtle differences in the flow distribution observed for high viscosity and low viscosity oils. The two-phase frictional pressure drop for separated flow patterns of both the liquid pairs is predicted using two-fluid model. Since the model predictions have a large mismatch with experimental data, an empirical correlation is also proposed for improved predictions. The homogeneous and drift flux models are used for slug and dispersed flow patterns.

1.
Russell
,
T. W. F.
, and
Charles
,
M. E.
, 1959, “
The Effect of Less Viscous Liquid in the Laminar Flow of Two Immiscible Liquids
,”
Can. J. Chem. Eng.
0008-4034,
37
, pp.
18
24
.
2.
Brauner
,
N.
, 1991, “
Two-Phase Liquid-Liquid Annular Flow
,”
Int. J. Multiphase Flow
0301-9322,
17
, pp.
59
76
.
3.
Arney
,
M. S.
,
Bai
,
R.
,
Guevara
,
E.
,
Joseph
,
D. D.
, and
Liu
,
K.
, 1993, “
Friction Factor and Hold Up Studies for Lubricated Pipelining—I. Experiments and Correlations
,”
Int. J. Multiphase Flow
0301-9322,
19
, pp.
1061
1076
.
4.
Bannwart
,
A. C.
, 2001, “
Modeling Aspects of Oil-Water Core-Annular Flows
,”
J. Pet. Sci. Eng.
0920-4105,
32
, pp.
127
143
.
5.
Prada
,
J. W. V
, and
Bannwart
,
A. C.
, 2001, “
Modeling of Vertical Core-Annular Flows and Application to Heavy Oil Production
,”
ASME J. Energy Resour. Technol.
0195-0738,
123
, pp.
194
199
.
6.
Grassi
,
B.
,
Strazza
,
D.
, and
Poesio
,
P.
, 2008, “
Experimental Validation of Theoretical Models in Two-Phase High-Viscosity Ratio Liquid–Liquid Flows in Horizontal and Slightly Inclined Pipes
,”
Int. J. Multiphase Flow
0301-9322,
34
, pp.
950
965
.
7.
Rodriguez
,
O. M. H.
,
Bannwart
,
A. C.
, and
Carvalho
,
C. H. M.
, 2009, “
Pressure Loss in Core Annular Flow: Modeling, Experimental Investigation and Full Scale Experiments
,”
J. Pet. Sci. Eng.
0920-4105,
65
, pp.
67
75
.
8.
Govier
,
G. W.
,
Sullivan
,
G. A.
, and
Wood
,
R. K.
, 1961, “
The Upward Vertical Flow of Oil Water Mixtures
,”
Can. J. Chem. Eng.
0008-4034,
39
, pp.
67
75
.
9.
Angeli
,
P.
, and
Hewitt
,
G. F.
, 1999, “
Pressure Gradient in Liquid-Liquid Flows
,”
Int. J. Multiphase Flow
0301-9322,
24
, pp.
1183
1203
.
10.
Lovick
,
J.
, and
Angeli
,
P.
, 2004, “
Experimental Studies on the Dual Continuous Flow Pattern in Oil–Water Flows
,”
Int. J. Multiphase Flow
0301-9322,
30
, pp.
139
157
.
11.
Chakrabarti
,
D. P.
,
Das
,
G.
, and
Ray
,
S.
, 2005, “
Pressure Drop in Liquid-Liquid Two-Phase Horizontal Flow: Experiments and Prediction
,”
Chem. Eng. Technol.
0930-7516,
28
, pp.
1003
1009
.
12.
Rodriguez
,
O. M. H.
, and
Oliemans
,
R. V. A.
, 2006, “
Experimental Study on Oil–Water Flow in Horizontal and Slightly Inclined Pipes
,”
Int. J. Multiphase Flow
0301-9322,
32
, pp.
323
343
.
13.
Jana
,
A. K.
, 2007, “
Hydrodynamics of Liquid-Liquid Two Phase Upflow Through Vertical Pipeline
,” Ph.D. thesis, IIT Kharagpur, Kharagpur, India.
14.
Hadžiabdić
,
M.
, and
Oliemans
,
R. V. A.
, 2007, “
Parametric Study of a Model for Determining the Liquid Flow-Rates From the Pressure Drop and Water Hold-Up in Oil–Water Flows
,”
Int. J. Multiphase Flow
0301-9322,
33
, pp.
1365
1394
.
15.
Bai
,
R.
,
Chen
,
K.
, and
Joseph
,
D. D.
, 1992, “
Lubricated Pipelining: Stability of Core-Annular Flow: Part 5. Experiments and Comparison With Theory
,”
J. Fluid Mech.
0022-1120,
240
, pp.
97
132
.
16.
Liu
,
L.
,
Matar
,
O. K.
, and
Hewitt
,
G. F.
, 2006, “
Laser-Induced Fluorescence (LIF) Studies of Liquid–Liquid Flows. Part II: Flow Pattern Transitions at Low Liquid Velocities in Downwards Flow
,”
Chem. Eng. Sci.
0009-2509,
61
, pp.
4022
4026
.
17.
Barnea
,
D.
,
Shoham
,
O.
, and
Taitel
,
Y.
, 1982, “
Flow Pattern Transition for Vertical Downward Two-Phase Flow
,”
Chem. Eng. Sci.
0009-2509,
5
, pp.
741
744
.
18.
Poesio
,
P.
, 2008, “
Experimental Determination of Pressure Drop and Statistical Properties of Oil-Water Intermittent Flow Through Horizontal Pipe
,”
Exp. Therm. Fluid Sci.
0894-1777,
32
, pp.
1523
1529
.
19.
Brauner
,
N.
, 2002, “
Liquid–Liquid Two-Phase Flow Systems
,”
Modeling and Control of Two-Phase Flow Phenomena
,
V.
Bertola
, ed.,
CISM Center
,
Udine, Italy
.
20.
Zuber
,
N.
, and
Findlay
,
I.
, 1965, “
Average Volumetric Concentration in Two-Phase Flow Systems
,”
ASME J. Heat Transfer
0022-1481,
87
, pp.
453
468
.
21.
Wallis
,
G. B.
, 1969,
One Dimensional Two Phase Flow
,
McGraw-Hill
,
New York
.
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