Experimental and modeling study on interfacial disturbance wave velocity in horizontal gas-liquid flow by ultrasonic method

摘要

Gas-liquid interface shows obvious disturbance characteristics in horizontal wavy and annular flow. The study of the characteristic parameters of interfacial disturbance wave is significant for understanding the gas-liquid two-phase flow. In this paper, using the ultrasonic echo resonance main frequency (UERMF) method, the non-contact measurement experiments are carried out to measure the liquid film thickness of gas-liquid wavy and annular flow in a 50 mm diameter horizontal pipe. Then the disturbance wave velocity is obtained by cross-correlation method under 220 different experimental conditions for pressures ranging from 0.1 MPa to 0.7 MPa, the superficial velocity of gas and liquid ranging from 10 m/s to 35 m/s and 0.006 m/s to 0.6 m/s, respectively. The experimental results are compared with existing predictive wave velocity correlations such as Marmottant correlation, Schubring correlation, etc. As a result, the existing correlations have certain limitations on reflecting the disturbance wave variation in both wavy and annular flows, and are also not applicable to high pressures. Considering all these factors, a new modified disturbance wave velocity correlation is proposed which satisfies' horizontal wavy, annular flow and high pressure system. Besides, the new correlation is compared with all the: experimental data in this paper and existing correlations in the references. The mean absolute error (MAE) is less than 15%, which verifies the extrapolation and applicability of the new interfacial disturbance wave velocity correlation.