Measurement of velocity of gas/solid swirl flow using Electrical Capacitance Tomography and cross correlation technique

One of the big challenges in multiphase flow measurements is velocity calculation. This paper describes utilizing dual-plane Electrical Capacitance Tomography (ECT) to estimate the velocity in case of multiphase swirl flow. A physical model is used in order to simulate the swirl flow phenomena and generate sequences of 2D tomographic reconstructed images. The use of cross-correlation of the signals from the two planes enables the velocity of the gas-solid flows to be calculated. In calculating the cross-correlation, a time-spatial cross-correlation is considered and it allows to perform the cross-correlation in a new way. Different tests were performed, in which the material concentration changes in time was analysed, and the angular velocity component of the flows is presented. The obtained results show the applicability of the approach.