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Theoretical Foundation for an Electromagnetic Two-Phase Flowmetry
Volume 152 · Number 1 · October 2005 · Pages 54-70
Technical Paper · Nuclear Reactor Thermal Hydraulics
Yeh-Chan Ahn, Byung Do Oh, Moo Hwan Kim
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The theory for the current-sensing electromagnetic flowmeter was newly developed. The current-sensing flowmeter can achieve the measurement with a high temporal resolution so that it can be applied to measure the flows with fast transients like two-phase flow. The signal prediction and the calibration of the current-sensing flowmeter in simplified two-phase flow were conducted, and the given calibration process would be an important step toward the calibration for real two-phase flow. The three-dimensional virtual potential distributions for the electrodes of finite size were computed for single-phase flow, annular flow, and modeled slug flow. With the gradient of the virtual potential, weight functions related to each flow pattern were deduced. A flow pattern coefficient f was introduced to simplify the calibration process for two-phase flow and measured with the impedance spectroscopy method. In order to measure the local mean velocity of a developing flow using the electromagnetic flowmeter, a localization parameter  was modeled and compared with experimental data.
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