Abstract
An advanced probe has been developed for transient and time-averaged measurement of the void fraction under various thermal-hydraulic conditions. The Electric Field Perturbation (EFP) probe operates by measuring the electrical properties of a two-phase mixture which are related to the void fraction by a theoretical electro-magnetic field model. Qualification tests were performed in both air-water and high pressure steam-water facilities. In the former set of experiments, the EFP measurements were compared to void fractions obtained with fast-acting valves and a hot-film anemometer. For high-pressure experiments in a pool boiling configuration, simultaneous void fraction time traces from the EFP probe and differential pressure cell indicated that the EFP probe responds well to overall void fraction fluctuations.
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