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The feasibility of applying Capacitively Coupled Contactless Conductivity Detection(C~4D)technique to measurement of bubble velocity in gas-liquid two-phase flow in millimeter-scale pipe is investigated.And,a new method,which combines the C~4D technique and the principle of cross-correlation velocity measurement,is proposed for the measurement of bubble velocity.This research includes two parts.First,based on the principle of C~4D,a new five-electrode C~4D sensor is developed.Then,with two conductivity signals obtained by the C~4D sensor,the velocity measurement of bubble is implemented according to the principle of cross-correlation.The research results indicate that the C~4D technique is highly effective and anticipates a broad potential in the field of two-phase flow.Experimental results show that the fiveelectrode C~4D sensor is suitable for measuring the velocity of single bubbles with a relative error of less than 5%.
The feasibility of applying Capacitively Coupled Contactless Conductivity Detection (C ~ 4D) technique to measurement of bubble velocity in gas-liquid two-phase flow in millimeter-scale pipe is investigated. And, a new method, which combines the C ~ 4D technique and the principle of cross-correlation velocity measurement, is proposed for the measurement of bubble velocity. This research includes two parts. First, based on the principle of C ~ 4D, a new five-electrode C ~ 4D sensor is developed. two conductivity signals obtained by the C ~ 4D sensor, the velocity measurement of bubble is implemented according to the principle of cross-correlation. the research results indicate that the C ~ 4D technique is highly effective and anticipates a broad potential in the field of two -phase flow. Experimental results show that the fiveelectrode C ~ 4D sensor is suitable for measuring the velocity of single bubbles with a relative error of less than 5%.