Effect of length-to-diameter ratio on axial velocity and hydrodynamic entrance length in air-water two-phase flow in vertical pipes

Joao F. Chidamoio, Lateef Akanji, Roozbeh Rafati

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Abstract

The effect of pipe length-to-diameter ratio (L/D) on air-water two phase slug flow regime development is hereby investigated. Axial velocity along the leading Taylor bubble and hydrodynamic entrance length required to establish a fully developed parabolic profile were critically assessed. The eccentricity distribution of axial velocity on leading Taylor bubble stream and on its nose is observed
in all the L/D geometry ratios. The radial component of the axial velocity profile in the liquid film ahead of the leading Taylor bubble is represented by a power law function; with exponent n=6.1 for L/D=833.3 and n=5.7 for L/D=1666.7. Despite a decrease in the exponent as L/D ratio increases, the full parabolic profile could not be reached. This suggests that further investigation on L/D
ratio incorporating other inherent variables which are likely to affect the development of the full parabolic profile may be required.
Original languageEnglish
Article number00003
Pages (from-to)1-7
Number of pages7
JournalJournal of Oil, Gas and Petrochemical Sciences
Volume1
Issue number1
Publication statusPublished - 19 Dec 2017

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Two phase flow
Hydrodynamics
Pipe
Air
Water
Liquid films
Bubbles (in fluids)
Geometry

Cite this

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title = "Effect of length-to-diameter ratio on axial velocity and hydrodynamic entrance length in air-water two-phase flow in vertical pipes",
abstract = "The effect of pipe length-to-diameter ratio (L/D) on air-water two phase slug flow regime development is hereby investigated. Axial velocity along the leading Taylor bubble and hydrodynamic entrance length required to establish a fully developed parabolic profile were critically assessed. The eccentricity distribution of axial velocity on leading Taylor bubble stream and on its nose is observedin all the L/D geometry ratios. The radial component of the axial velocity profile in the liquid film ahead of the leading Taylor bubble is represented by a power law function; with exponent n=6.1 for L/D=833.3 and n=5.7 for L/D=1666.7. Despite a decrease in the exponent as L/D ratio increases, the full parabolic profile could not be reached. This suggests that further investigation on L/Dratio incorporating other inherent variables which are likely to affect the development of the full parabolic profile may be required.",
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T1 - Effect of length-to-diameter ratio on axial velocity and hydrodynamic entrance length in air-water two-phase flow in vertical pipes

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AU - Akanji, Lateef

AU - Rafati, Roozbeh

PY - 2017/12/19

Y1 - 2017/12/19

N2 - The effect of pipe length-to-diameter ratio (L/D) on air-water two phase slug flow regime development is hereby investigated. Axial velocity along the leading Taylor bubble and hydrodynamic entrance length required to establish a fully developed parabolic profile were critically assessed. The eccentricity distribution of axial velocity on leading Taylor bubble stream and on its nose is observedin all the L/D geometry ratios. The radial component of the axial velocity profile in the liquid film ahead of the leading Taylor bubble is represented by a power law function; with exponent n=6.1 for L/D=833.3 and n=5.7 for L/D=1666.7. Despite a decrease in the exponent as L/D ratio increases, the full parabolic profile could not be reached. This suggests that further investigation on L/Dratio incorporating other inherent variables which are likely to affect the development of the full parabolic profile may be required.

AB - The effect of pipe length-to-diameter ratio (L/D) on air-water two phase slug flow regime development is hereby investigated. Axial velocity along the leading Taylor bubble and hydrodynamic entrance length required to establish a fully developed parabolic profile were critically assessed. The eccentricity distribution of axial velocity on leading Taylor bubble stream and on its nose is observedin all the L/D geometry ratios. The radial component of the axial velocity profile in the liquid film ahead of the leading Taylor bubble is represented by a power law function; with exponent n=6.1 for L/D=833.3 and n=5.7 for L/D=1666.7. Despite a decrease in the exponent as L/D ratio increases, the full parabolic profile could not be reached. This suggests that further investigation on L/Dratio incorporating other inherent variables which are likely to affect the development of the full parabolic profile may be required.

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JO - Journal of Oil, Gas and Petrochemical Sciences

JF - Journal of Oil, Gas and Petrochemical Sciences

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