A Device and Method For Flowrate Measurement of Fluid in Small Channel Based on C~4D Technique

The flowrate measurement devices or instruments in small channel are very limited.Based on Capacitively Coupled Contactless Conductivity Detection(C~4D) technique and cross-correlation velocity measurement principle,a new method for flowrate measurement in millimeter-scale pipe is proposed and a new measurement device is developed.Two pairs of electronic switches are used to obtain two independent conductivity signals of the fluid.By cross-correlating the two signals,the velocity and flowrate of the fluid can be determined.As a preliminary research,flowrate measurement experiments are carried out in two pipes with the inner diameters of 3.2 mm and 5.4 mm,respectively.The experimental results show that the new proposed method based on C~4D technique for flowrate measurement is feasible and effective.