Liquid film thickness measurement for gas-liquid two phase flow using ultrasound

Mi Wang, Dandan Zheng, Ying Xu, Ziqiang Cui

Abstract: Liquid film thickness is one of the most important characteristic parameters for gas-liquid two phase flow, and the measurement technology and method of liquid film thickness are of great significance for studying heat and mass transfer characteristics. The common pulse echo method can't measure thin thickness and thin film resonance method is affected by multiple echoes and noise. To overcome above defects, a new method called ultrasonic echo resonance main frequency (UERMF) method is proposed to measure liquid film thickness. The experiment is carried out in a 50 mm diameters horizontal tube. The range of superficial velocities covered in the test is 10-30m/s for air and 0.006-0.1m/s for water, and pressure is 0.1-0. 5MPa. Furthermore, a conductance probe method is used to verify the feasibility of this UERMF method under 0.1MPa, and good agreement is found between them and the error is less than ± 10%.