Abstract
Capacitance type electro-void fraction meters with various geometries of electrodes were developed for two-phase flow measurement in tubes of 1mm in the smallest diameter. Ring-type electrodes were applied to measure void fraction. The principle of the meter is that the electrical capacitance depends on integrated dielectricity of gas-liquid two-phase flow with void fraction. A high-frequency power supply enables to measure the low electrical capacitance of the water including purified water. It was confirmed with the air-water two-phase flow experiments that void fraction can be obtained in real time way every 50 milliseconds. Void fraction in the experiments ranged from 0% to higher than 90%. The void fraction was correlated with the electric capacitance by a linear function for the ring-electrode under the atmospheric condition.
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