Comparison of gamma-densitometry tomography and electrical-impedance tomography for determining material distribution in liquid-solid flows

Conference · Sat Mar 01 04:00:00 EST 1997

OSTI ID:474847

Shollenberger, K A; Torczynski, J R; O`Hern, T J; Adkins, D R ^[1]; Ceccio, S L; George, D L ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States). Engineering Sciences Center
2. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Mechanical Engineering and Applied Mechanics

The spatial distribution of materials in multiphase flows is of importance to many industrial processes. For example, in indirect coal liquefaction, a reactive gas is bubbled through a catalyst-laden liquid (slurry), and a spatially nonuniform gas distribution can reduce process efficiency by inducing large-scale buoyancy-driven recirculating flows. Gamma-densitometry tomography (GDT) and electrical-impedance tomography (EIT) are techniques with the potential of providing spatially resolved information on material distribution in multiphase flows. GDT and EIT have both been applied to a liquid-solid flow for comparison purposes. The experiment consisted of a cylinder (19 cm diameter) filled with water, in which 80 {micro}m glass spheres were suspended by a mixer to achieve solid volume fractions of 0.01, 0.02, and 0.03. Both GDT and EIT revealed a relatively uniform distribution of solids in the measurement plane, and the average solid volume fractions from both techniques were in good agreement.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 474847
• Report Number(s): SAND--97-0361C; CONF-970670--1; ON: DE97003838
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMPARATIVE EVALUATIONS
ELECTRIC IMPEDANCE
GAMMA RADIATION
LIQUID FLOW
SOLIDS FLOW
SPATIAL DISTRIBUTION
TOMOGRAPHY
TWO-PHASE FLOW