Oil & Gas Research
Open Access

Flow Development Length and Inlet Effect in Vertical Two-phase Flow

Copyright: © 2020  . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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The aim of this work was to analyze inlet effect and patterns
development length of the vertical gas-liquid flow experimentally.
The study was conducted in multiphase rig with a test section
of 18m long pipeline and 60 mm internal diameter. Two
types of inlets were considered. Four conductivity probe rings
were installed at four different positions along the test section.
Water flow rate was kept at 0.07 m/s by adjusting pump frequencies
and water inlet valve. Air was varied from 4 m/s to 22
m/s at atmospheric pressure and temperature so that to attain
different types of flow pattern. Recognition of flow patterns
was done by considering four methods; observation with aid of
high-speed camera, time series of conductance signals, signals
probability density functions and distribution moments about
mean. Conductance signals were collected for about two minutes
for each test after attaining steady state flow. The results
show that with steady state flow, patterns transition can occur
within a test section while the inlet effect is very small for slug
propagation within a test section

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