Research On The Effect Of Enhanced Heat Exchange Tube Type On Ultrasonic Propagation And Cavitation

Widely used heat exchange equipment always has scaling problems in the heatexchange surface in industry, this phenomenon not only affect the performance ofheat exchange equipment, reduce heat exchange efficiency, but also affect the safeoperation of the equipment. As ultrasonic scaling technology has advantages ofsimple, efficient, non-polluting, continuous operation, high degree of automation,reliable performance and so on, it has been widely used in heat exchange equipmentin recent years.At present, the research of ultrasonic scaling effect factors mainly has twoaspects which include ultrasonic parameters and heat exchange medium parameters,little research about pipe geometry influence of ultrasonic scaling has been reported.In order to solve this problem, ultrasonic test bench has been constructed, outletsound intensity and cavitation noise fraction of different pipes of pipe, corrugatedpipe, threaded pipe and stripes tube have been measured, ultrasonic wavepropagation characteristics and cavitation effects of different pipe types have beenanalysed, and the influence mechanism also has been analysed deeply.This paper researches the spread and cavitation of ultrasound in strengtheningheat exchange tube, and analyzes the factors that the spread and cavitation effects ofultrasound in the tube by the experiment:heat transfer medium, heat exchange tubetype. Find the best heat transfer medium, and the most beneficial heat exchange tubetype of ultrasonic scaling.The experiment result indicates that pipe geometry structure has a significanteffect on ultrasonic propagation characteristics and cavitation effect, among variouskinds of tube type, the pipe is most conducive to the spread of ultrasound, comparedwith the circular tube ultrasonic in heat strengthening tube the transmissioncharacteristics is poorer. the ultrasonic transmission characteristics of horizontalgrain pipe and threaded pipe is worse than circular tube, in corrugated pipe is theworst. In horizontal grain tube and screw thread tube, because the higher turbulence intensity, more conducive to ultrasonic cavitation. Ultrasonic cavitation in thehorizontal grain pipe and threaded pipe effect is superior to the circular tube, but inthe corrugated pipe the too big of turbulence intensity to inhibition the ultrasoniccavitation effect. The geometric parameters of tube type has obvious effect on theultrasonic transmission, compared with the change of fluid parameters, the change ofpipe geometric parameters has more evident effects on ultrasonic cavitation.