Please use this identifier to cite or link to this item: https://repositorio-aberto.up.pt/handle/10216/92090
Author(s): J. F. R. Guedes de Carvalho
M. J. F. Ferreira
Title: Pressure drop in gas slugs in vertical tubes and flooding instability
Issue Date: 2000
Abstract: Fast-response differential-pressure transducers were used to continuously monitor the pressure difference between two nearby points along single gas slugs rising in long vertical tubes filled with liquid. Operating pressures in the 0.6 to 6.0-MPa range gave slugs of argon with densities in the 10 to 100-kg/m3 range, rising through mixtures of glycerol and water with viscosities in the 10-3 - to 305 x 10-3-Pa · s. range. The transducer records suggest that, for all the liquids tested, there was flooding instability of the film flowing around the slugs when the gas density was raised sufficiently. With the assumption that flooding instability is due to the force on the waves moving along the gas - liquid interface, dimensional analysis shows that the observations with gas slugs correlate well with flooding data obtained in wetted wall tubes operating at atmospheric pressure. The work reveals strong limitations of current empirical correlations for the prediction of flooding in wetted wall tubes.Fast-response differential-pressure transducers were used to continuously monitor the pressure difference between two nearby points along single gas slugs rising in long vertical tubes filled with liquid. Operating pressures in the 0.6 to 6.0-MPa range gave slugs of argon with densities in the 10 to 100-kg/m3 range, rising through mixtures of glycerol and water with viscosities in the 10-3- to 305×10-3-Pa·s range. The transducer records suggest that, for all the liquids tested, there was flooding instability of the film flowing around the slugs when the gas density was raised sufficiently. With the assumption that flooding instability is due to the force on the waves moving along the gas-liquid interface, dimensional analysis shows that the observations with gas slugs correlate well with flooding data obtained in wetted wall tubes operating at atmospheric pressure. The work reveals strong limitations of current empirical correlations for the prediction of flooding in wetted wall tubes.
Subject: Outras ciências da engenharia e tecnologias
Other engineering and technologies
Scientific areas: Ciências da engenharia e tecnologias::Outras ciências da engenharia e tecnologias
Engineering and technology::Other engineering and technologies
URI: http://hdl.handle.net/10216/92090
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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