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Research Papers: Fundamental Issues and Canonical Flows

Pressure Drop Analysis for Liquid-Liquid Downflow Through Vertical Pipe

[+] Author and Article Information
S. Ghosh

Department of Chemical Engineering, IIT Kharagpur, Kharagpur 721302, India

G. Das1

Department of Chemical Engineering, IIT Kharagpur, Kharagpur 721302, Indiagargi@che.iitkgp.ernet.in

P. K. Das

Department of Mechanical Engineering, IIT Kharagpur, Kharagpur 721302, India

1

Corresponding author.

J. Fluids Eng 133(1), 011202 (Jan 28, 2011) (10 pages) doi:10.1115/1.4003354 History: Received May 11, 2010; Revised December 25, 2010; Published January 28, 2011; Online January 28, 2011

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.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 9

A comparison of frictional pressure gradient predictions by drift flux model and measured values for mixed flow patterns

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Figure 1

Schematic of experimental setup

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Figure 2

Flow pattern map of oil-water downflow through a vertical glass pipe

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Figure 3

Frictional pressure gradient as a function of mixture velocity with oil superficial velocity as parameter

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Figure 4

Pressure drop reduction factor as a function of inlet water fraction

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Figure 5

Variation of power reduction factor with inlet water fraction

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Figure 6

Validation of frictional pressure gradient as predicted by two-fluid model with measured values for separated flow patterns

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Figure 7

Validation of frictional pressure gradient as predicted using Eq. 19 with measured values for separated flow patterns

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Figure 8

Validation of frictional pressure gradient as predicted by homogeneous model with measured values for mixed flow patterns

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