Abstract
The electro-void fraction meter (Impedance Type meter) is practical for high void fraction measurement. It can be used with various shapes of flow conduits such as round, rectangular and rod-bundle geometries. The principle of the meter is that the electrical impedance of a gas-liquid two-phase flow changes with respect to the void fraction. High-frequency power supply enables to measure the void fraction of the electrical conductivity of the water. It was confirmed by an air-water two-phase flow experiment that void fraction can be obtained in real time by measuring the impedance of the two-phase flow. Void fraction ranging from 0% to 90% in a 37-rod bundle were successfully measured under atmospheric pressure conditions.
