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COBEM 2023
27th International Congress of Mechanical Engineering
Chordal Measurement of Phase Fraction Distribution in Stratified Flow pattern in Dense-Gas/Liquid Pipe flow Via Gamma-Ray Densitometry.
Submission Author:
Cristhian Alvarez Pacheco , SP , Brazil
Co-Authors:
Cristhian Alvarez Pacheco, Carlos Mauricio Ruiz Diaz, Luis Felipe Acuna Alegria, Oscar Mauricio Hernandez Rodriguez
Presenter: Cristhian Alvarez Pacheco
doi://10.26678/ABCM.COBEM2023.COB2023-0185
Abstract
Gas/liquid two-phase flow is of common occurrence in the petroleum, nuclear, thermoelectric, and chemical industries. Stratified flow is one of the smoothest flows, because it occurs at low flows of liquid and gas, and these two immiscible phases are separated by gravity, with the liquid phase at the bottom of the pipe and the gas phase at the top. Moreover, it is of common occurrence in the Brazilian offshore production scenario, in directional wells and subsea lines. An interesting feature of the pre-salt flow condition is that the gas has a density similar to that of the liquid due to the very high pressure, therefore a low liquid-gas density ratio is observed. The main objective of this work is performing experimental tests with dense gas (SF6) and mineral oil in the stratified flow pattern. Chordal measurement of the cross-sectional phase fraction distribution in a horizontal 2"-i.d. 15-m-length stainless steel pipe. A specially designed collimator assures good spatial sensitivity, and a mechanical device allows for micrometric vertical displacement of a gamma-ray densitometry equipment. A high-speed camera will be used to obtain a detailed visualization of the flow pattern for validation purposes. The gamma-ray equipment consists of an emitting source of the isotope Celsium-137 (Cs137) and a Scintillation Nal (TI) receiver.
Keywords
Gas-Liquid Flow, dense gas, Gamma-ray densitometry, Stratified flow, chordal phase fraction distribution
