EPTT 2022

13th Spring School on Transition and Turbulence

CFD study of transient behavior of gas-liquid wavy-stratified flow through an orifice plate

Submission Author: Josiane Weise , SC
Co-Authors: Josiane Weise, Emilio Paladino
Presenter: Josiane Weise

doi://10.26678/ABCM.EPTT2022.EPT22-0025

 

Abstract

The multiphase flow through differential pressure (DP) flow meters has a complex behavior, mainly if large-scale interfaces characterize the upstream flow. In this work, a transient Computational Fluid Dynamic (CFD) study of wavy-stratified gas-liquid flow through an orifice plate is presented. The geometry considered is a 0.5 diameter ratio orifice plate arranged in a 25.4 mm internal diameter horizontal pipe. The Two-Fluid model was employed as the multiphase approach, and the realizable k-e mixture model was used for turbulence modeling. A hybrid segregated-dispersed drag model was implemented, considering the sudden phase morphology change that occurs with the interaction of the phases with the orifice plate. Results for two air-water flow experimental conditions at atmospheric pressure are discussed. Transient fluctuations of DP and phase distributions were compared with the DP signal and flow images acquired with a High-Speed Camera in an experimental facility designed for this study. The model could represent the propagation of waves in the upstream flow and the positive correlation between the DP fluctuations and the liquid fraction in the gas-liquid mixture. The CFD results provide a detailed fluid dynamics analysis to understand the correlation between the liquid fraction and the DP fluctuations, which is essential for developing the technique that measures the flow rate of both phases from a single measuring DP instrument.

Keywords

Gas-liquid flows, orifice plate, differential pressure fluctuations, CFD, Two Fluid Model, hybrid drag model

 

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