静電容量検出型電気式ボイド率計の実用化に関する実験的研究

Experimental study on feasibility of capacitance void fraction meters

渡辺 博典; 光武 徹*; 柿崎 禎之*; 高瀬 和之

Watanabe, Hironori; Mitsutake, Toru*; Kakizaki, Sadayuki*; Takase, Kazuyuki

The electro-void fraction meter (Capacitance type meter) was applied to high void fraction measurement with various shapes of flow conduits such as round, rectangular and rod-bundle geometries. The principle of the meter is that the electrical capacitance of a gas-liquid two-phase flow changes with the void fraction. High-frequency power supply enables to measure the electrical capacitance of the ion-exchanged water with even though conductivity as low as 1 S/cm. It was confirmed by the air-water and steam-water boiling two-phase flow experiments that void fraction can be obtained in real time way. Void fraction ranging from 0 to 0.9 at maximum was successfully measured under steam-water boiling two-phase flow conditions of 2 MPa through 18 MPa pressure.