A New Method for the Velocity Measurement of Gas-Liquid Two-Phase Flow

The application potential of Capacitively Coupled Contactless Conductivity Detection ((CD)-D-4) technique to the velocity measurement of gas-liquid two-phase flow in millimeter-scale pipe is investigated. Combining (CD)-D-4 technique and cross-correlation velocity measurement technique, a new velocity measurement method is proposed. The research work includes three parts. First, a three-electrode (CD)-D-4 sensor, which is suitable for the velocity measurement of gas-liquid two-phase flow in millimeter-scale pipe, is developed. Second, with the two independent conductivity signals of fluid obtained by the developed sensor, the velocity measurement of gas-liquid two-phase flow is implemented by the cross-correlation velocity measurement technique. Finally, velocity measurement experiments are carried out to verify the effectiveness of the proposed method. The research results indicate that the proposed velocity measurement method is effective and the developed sensor is successful. (CD)-D-4 technique may provide a useful approach for parameter measurement of gas-liquid two-phase flow in millimeter-scale pipe.