Effect of enhanced heat exchange tube type on ultrasonic propagation and cavitation

The study of ultrasonic de-scaling factors is limited in ultrasonic parameters and heat transfer medium parameters,the effect of pipe geometry structure is seldom studied. Through the self-made ultrasound test bench with enhanced heat exchanger tubes of circular tube,corrugated pipe,threaded pipe and horizontal grain pipe the sound intensity and cavitation noise integral number at outlets of different pipe types were measured,the ultrasonic propagation characteristics and cavitation effect in different pipe types were analyzed,and the influence mechanism was discussed. The geometrical structure of the tube type significantly affected ultrasonic propagation characteristics and cavitation. Compared with circular tube,the ultrasonic propagation characteristics in heat exchange tubes was poorer. Due to increase of turbulence intensity,horizontal grain pipe and threaded pipe could promote ultrasonic cavitation,while corrugated pipe decreased the strength of cavitation because of too high turbulence intensity.