Three-phase material distribution measurements in a vertical flow using gamma-densitometry tomography and electrical-impedance tomography

• Published in: International journal of multiphase flow Vol. 27; no. 11; pp. 1903 - 1930
• Main Authors: George, D.L., Shollenberger, K.A., Torczynski, J.R., O'Hern, T.J., Ceccio, S.L.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.11.2001; Elsevier
• Subjects: Bubble column; Density (specific gravity); Electrical-impedance tomography; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Gamma-densitometry tomography; Gas volume fraction; Instrumentation for fluid dynamics; Multiphase and particle-laden flows; Multiphase flow; Nonhomogeneous flows; Physics; Polystyrenes; Radial flow; Solid electrolytes; Tomography; Volume fraction; Gamma-densitometry tomography; Multiphase flow; Gas volume fraction; Bubble column; Electrical-impedance tomography; Test facilities; Volume fraction; Vertical pipe; Measuring methods; Liquid column; Experimental study; Three phase flow; Gamma radiation; Gas liquid solid; Tomography; Densitometry; Electric impedance
• ISSN: 0301-9322; 1879-3533
• DOI: 10.1016/S0301-9322(01)00042-8

Experiments are presented in which electrical-impedance tomography (EIT) and gamma-densitometry tomography (GDT) measurements are combined to simultaneously measure the solid, liquid, and gas radial distributions in a vertical three-phase flow. The experimental testbed is a 19.05-cm diameter bubble column in which gas is injected at the bottom and exits out the top while the liquid and solid phases recirculate. The gas phase is air and the liquid phase is deionized water with added electrolytes. For the solid phase four different particle classes are investigated: 40–100 μm and 120–200 μm glass particles ( 2.41 g/cm 3 ), and 170–260 μm and 200–700 μm polystyrene particles ( 1.04 g/cm 3 ). Superficial gas velocities of 3–30 cm/s and solid volume fractions up to 0.30 are examined. For all experimental conditions investigated, the gas distribution shows only a weak dependence on both particle size and density. The average gas volume fraction as a function of superficial gas velocity can be described to within ±0.04 by a single curve. For most cases, the solid particles appear to be uniformly dispersed in the liquid.