Characterization of gas-liquid flow with coupled ultrasonic field
Power ultrasound as an emerging green technology is receiving increasing attention from oil industry.Due to large pressure difference within fluids,ultrasonic cavitation occurs and physical and chemical effects of cavitation bubble nucleation,growth,convection and collapse as well as periodic oscillation and instantaneous rupture can play important roles.In this study,simulation results indicate that increasing ultrasonic frequency and reducing the distance between bubbles lead to a reduction in the maximum radius of individual cavitation bubbles.The augmentation of the number of bubbles diminishes the speed of bubble growth to rupture,while prolonging ultrasonic exposure time and elevating ultrasonic frequency enhance the maximum cavitation pressure in the ultrasonic field.Experimental findings demonstrate a continuous oscillation and aggregation of cavitation bubbles in the ultrasonic field,which intensifies with prolonged ultrasonic exposure.This study provides important theoretical guidance for the application of ultrasound in industrial petroleum production.
万方数据
维普
