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Electrical-Impedance Tomography for Opaque Multiphase Flows in Metallic (Electrically-Conducting) Vessels.

DE2003805878

Publication Date	2002
Personal Author	Liter, S. G.; Torczynski, J. R.; Shollenberger, K. A.; Ceccio, S. L.
Page Count	88
Abstract	A novel electrical-impedance tomography (EIT) diagnostic system, including hardware and software, has been developed and used to quantitatively measure material distributions in multiphase flows within electrically-conducting (i.e., industrially relevant or metal) vessels. The EIT system consists of energizing and measuring electronics and seven ring electrodes, which are equally spaced on a thin nonconducting rod that is inserted into the vessel. The vessel wall is grounded and serves as the ground electrode. Voltage-distribution measurements are used to numerically reconstruct the time-averaged impedance distribution within the vessel, from which the material distributions are inferred. Initial proof-of-concept and calibration was completed using a stationary solid-liquid mixture in a steel bench-top standpipe. The EIT system was then deployed in Sandia's pilot-scale slurry bubble-column reactor (SBCR) to measure material distributions of gas-liquid two-phase flows over a range of column pressures and superficial gas flow rates.
Keywords	Tomography Multiphase flows Measurements Recommendations Apparatus Validation tests Uncertainty sources Diagnostic systems Metallic vessels Electrical-impedance tomography Sandia National Laboratories Gamma-densitometry tomography(GDT)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Sandia National Labs., Albuquerque, NM. Engineering Sciences Center.; California Polytechnic State Univ., San Luis Obispo.; Department of Energy, Washington, DC.; Michigan Univ., Ann Arbor. Dept. of Mechanical Engineering and Applied
Supplemental Notes	Prepared in cooperation with California Polytechnic State Univ., San Luis Obispo. and Michigan Univ., Ann Arbor. Dept. of Mechanical Engineering and Applied Mechanics. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200318

Electrical-Impedance Tomography for Opaque Multiphase Flows in Metallic (Electrically-Conducting) Vessels.

Electrical-Impedance Tomography for Opaque Multiphase Flows in Metallic (Electrically-Conducting) Vessels.
DE2003805878

Publication Date	2002
Personal Author	Liter, S. G.; Torczynski, J. R.; Shollenberger, K. A.; Ceccio, S. L.
Page Count	88
Abstract	A novel electrical-impedance tomography (EIT) diagnostic system, including hardware and software, has been developed and used to quantitatively measure material distributions in multiphase flows within electrically-conducting (i.e., industrially relevant or metal) vessels. The EIT system consists of energizing and measuring electronics and seven ring electrodes, which are equally spaced on a thin nonconducting rod that is inserted into the vessel. The vessel wall is grounded and serves as the ground electrode. Voltage-distribution measurements are used to numerically reconstruct the time-averaged impedance distribution within the vessel, from which the material distributions are inferred. Initial proof-of-concept and calibration was completed using a stationary solid-liquid mixture in a steel bench-top standpipe. The EIT system was then deployed in Sandia's pilot-scale slurry bubble-column reactor (SBCR) to measure material distributions of gas-liquid two-phase flows over a range of column pressures and superficial gas flow rates.
Keywords	Tomography Multiphase flows Measurements Recommendations Apparatus Validation tests Uncertainty sources Diagnostic systems Metallic vessels Electrical-impedance tomography Sandia National Laboratories Gamma-densitometry tomography(GDT)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Sandia National Labs., Albuquerque, NM. Engineering Sciences Center.; California Polytechnic State Univ., San Luis Obispo.; Department of Energy, Washington, DC.; Michigan Univ., Ann Arbor. Dept. of Mechanical Engineering and Applied
Supplemental Notes	Prepared in cooperation with California Polytechnic State Univ., San Luis Obispo. and Michigan Univ., Ann Arbor. Dept. of Mechanical Engineering and Applied Mechanics. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200318