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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
UPSTREAM DISTURBANCES INDUCED BY AN ORIFICE PLATE ON A HORIZONTAL GAS-LIQUID MIXTURE FLOWING ON THE SLUG REGIME
Submission Author:
Nathan Maidana , SP
Co-Authors:
Eugênio Spanó Rosa
Presenter: Nathan Maidana
doi://10.26678/ABCM.ENCIT2016.CIT2016-0033
Abstract
The horizontal slug flow through orifice plates is analyzed through the influence of orifices’ sizes on the upstream slug flow structure. It is expected that the alternate passage of liquid slugs and liquid films associated to elongated bubbles will cause an intermittent pressure difference at the orifice which will propagate upstream disturbing the velocities, the lengths, the frequency of passage and above all the slug formation. The experimental study is carried on a horizontal air-water flow on the slug regime through an orifice plate. The test section consists of a transparent acrylic pipe with 26 mm ID and 26.24 m long. The orifice plate is placed at 632 pipe diameters downstream the inlet. Three orifices are tested with area contraction ratios of 0.250, 0.123 and 0.072. Measurement of the pressure fluctuations, the instantaneous void fraction as well as the lengths and velocities of the slugs are taken at the test section. The analysis of the experimental data discloses how the slug flow properties are changed due to an area obstruction by comparing with the data of a straight pipe without area contraction.
Keywords
void fraction, pressure difference, air-water, Slug Flow, orifice plate, void fraction, pressure difference, air-water, Slug Flow, orifice plate, void fraction, orifice plate, Slug Flow, air-water, pressure difference, void fraction, pressure difference, air-water, Slug Flow, orifice plate, void fraction, pressure difference, air-water, Slug Flow, orifice plate
