Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
STABILITY ANALYSIS OF LONG INTERFACIAL WAVES IN GAS-LIQUID PIPE FLOW USING A LEVEL-SET APPROACH
Submission Author:
Matheus Dias , RJ , Brazil
Co-Authors:
Matheus Dias, Daniel Rodriguez
Presenter: Matheus Dias
doi://10.26678/ABCM.ENCIT2018.CIT18-0064
Abstract
Linear stability analysis is used to model and predict the main characteristics of long interfacial waves appearing spontaneously in air-water flow along a very long pipe of circular cross-section. Reynolds numbers are high enough to ensure that the air phase is in turbulent regime. A local stability analysis for two-phase flows based on the Level Set approach is applied, that only requires of the mean turbulent field as external data. Data from a series of companion experiments using hot-wire, conductance probes and a novel PIV which measures simultaneously the two phases is used here to provide the mean flow and to compare the predictions of the stability calculations for the interfacial waves. Linear stability analysis is found to predict well the dominant wavelengths and frequencies, as well as the spatial structure of the velocity fluctuations, for this kind of long gravitational waves.
Keywords
multiphase flow, Flow instability, Turbulence, Interfacial waves
