Two methods for measurement of gas-liquid flows in vertical upward pipe using dual-plane ERT system

A dual-plane Electrical Resistance Tomography (ERT) system is employed to combine ERT with cross correlation technique to measure the gas phase volumetric flowrate in gas-liquid flows in vertical upward pipe. According to the uniformity of the local void fraction distribution and the velocity distribution of gas phase, pixel-correlation method and eigenvalue-correlation method are put forward to estimate the gas phase volumetric flowrate. This paper compares the two estimate methods and makes preliminary study of the applicability of the two methods. Two experiments were designed to evaluate the validity of those two estimate methods. Experimental results were presented to analyze their characters respectively.