Local flow measurements of vertical upward bubbly flow in an annulus

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1479-1496
Journal / PublicationInternational Journal of Heat and Mass Transfer
Volume46
Issue number8
Publication statusPublished - Apr 2003
Externally publishedYes

Abstract

Local measurements of flow parameters were performed for vertical upward bubbly flows in an annulus. The annulus channel consisted of an inner rod with a diameter of 19.1 mm and an outer round tube with an inner diameter of 38.1 mm, and the hydraulic equivalent diameter was 19.1 mm. Double-sensor conductivity probe was used for measuring void fraction, interfacial area concentration, and interfacial velocity, and laser Doppler anemometer was utilized for measuring liquid velocity and turbulence intensity. A total of 20 data sets for void fraction, interfacial area concentration, and interfacial velocity were acquired consisting of five void fractions, about 0.050, 0.10, 0.15, 0.20, and 0.25, and four superficial liquid velocities, 0.272, 0.516, 1.03, and 2.08 m/s. A total of eight data sets for liquid velocity and turbulence intensity were acquired consisting of two void fractions, about 0.050, and 0.10, and four superficial liquid velocities, 0.272, 0.516, 1.03, and 2.08 m/s. The constitutive equations for distribution parameter and drift velocity in the drift-flux model, and the semi-theoretical correlation for Sauter mean diameter namely interfacial area concentration, which were proposed previously, were validated by local flow parameters obtained in the experiment using the annulus. © 2002 Elsevier Science Ltd. All rights reserved.

Research Area(s)

  • Annulus, Bubble size, Double-sensor conductivity probe, Drift-flux model, Gas-liquid bubbly flow, Interfacial area concentration, Laser Doppler anemometer, Liquid velocity, Multi-phase flow, Turbulence intensity, Void fraction

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