Void fraction measurement of gas-liquid two-phase flow based on C4D technique

The feasibility of applying capacitively coupled contactless conductivity detection (C⁴D) technique to void fraction measurement of gas-liquid two-phase flow is investigated. As a preliminary study, this research focuses on the void fraction measurement of stratified flow and includes three parts. First, a C⁴D sensor is developed based on series resonance principle, and a void fraction measurement system of gas-liquid two-phase flow is constructed based on C⁴D technique. Second, simulation analysis is performed to study the performance of the developed C⁴D sensor for void fraction measurement. Third, with the constructed void fraction measurement system, experiments are carried out in the pipe with 15.6mm inner diameter, and the measurement results are compared with the simulation results. Experiment results show that the developed C⁴D sensor is successful and the constructed void fraction measurement system is effective. The monotonicity and the resolution of the developed C⁴D sensor for void fraction measurement are satisfactory. The comparison of the simulation results and the experiment results shows that the practical measurement results are in good agreement with the simulation analysis. This research work verifies that applying C⁴D to void fraction measurement of gas-liquid two-phase flow is feasible (at least, for the void fraction measurement of stratified flow).