The comments present an assessment of formulations for frictional pressure gradient correlation of moderately viscous lubricating oil–water two-phase flow through a horizontal pipe of 0.025 m internal diameter, which was obtained by Dasari et al. [1]. Their modified Lockhart–Martinelli correlation was 
φW2=0.019X3+0.06X2-0.006X+1.397
(1)
Recently, Muzychka and Awad [2] developed an alternative approach for predicting two-phase frictional pressure gradients using superposition of three pressure gradients: single-phase liquid, single-phase gas, and interfacial pressure gradient. Muzychka and Awad [2] obtained an expression for the two-phase frictional interfacial multiplier for the liquid phase (ϕl,i2) as follows: 
φl,i2=φl2-1-1X2
(2)

From Eq....

References

References
1.
Dasari
,
A.
,
Desamala
,
A. B.
,
Ghosh
,
U. K.
,
Dasmahapatra
,
A. K.
, and
Mandal
,
T. K.
,
2014
, “
Correlations for Prediction of Pressure Gradient of Liquid–Liquid Flow Through a Circular Horizontal Pipe
,”
ASME J. Fluids Eng.
,
136
(
7
), p.
071302
.10.1115/1.4026582
2.
Muzychka
,
Y. S.
, and
Awad
,
M. M.
,
2010
, “
Asymptotic Generalizations of the Lockhart–Martinelli Method for Two Phase Flows
,”
ASME J. Fluids Eng.
,
132
(
3
), p.
031302
.10.1115/1.4001157
3.
Lockhart
,
R. W.
, and
Martinelli
,
R. C.
,
1949
, “
Proposed Correlation of Data for Isothermal Two-Phase, Two-Component Flow in Pipes
,”
Chem. Eng. Prog., Symp. Ser.
,
45
(
1
), pp.
39
48
.
4.
Awad
,
M. M.
, and
Butt
,
S. D.
,
2009
, “
A Robust Asymptotically Based Modeling Approach for Two-Phase Liquid–Liquid Flow in Pipes
,”
ASME 28th International Conference on Offshore Mechanics and Arctic Engineering (OMAE2009), Session: Petroleum Technology, Multiphase Flow I
,
Honolulu
, HI, May 31–June 5, 2009, Paper No. OMAE2009-79072.
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