Analysis And Simulation On Acoustic Characteristics Of Condenser For Ultrasonic Cleaning

The scaling phenomenon of the cooling water circulating in the metal pipe has always been a problem, particularly in the chemical, petroleum, metallurgy, power industry etc. On the one hand, the scale will reduce the efficiency of the heat transfer, and increase the consumption of the energy; On the other hand, it will shorten life cycle of the equipment,causing accidents in production. Therefore, the research and application on descaling technology have very significant economic and social benefits.At present, the removal methods of the scale on the heater are generally divided into mechanical method and chemical method, and each method has its own applicable occasions and advantages, but it is not ideal enough effectiveness evaluation of the integrated descaling. In recent years, it is constantly exploring and researching on new descaling methods, and the ultrasonic integrated descaling method has been more and more widely used because of its good performance. When ultrasonic acting on the fluid, there would be a series of physical and chemical effects, which makes the physique and chemical property of the scale in fluid was changed under the effect of ultrasonic field and consequently, the scale was scattered and shattered, so as to achieve the purpose of descaling.Cavitation effect is the primary mechanism of ultrasonic for descaling, that is the micro-bubbles existing in liquid continuously suffer tension or compression on the alternating effect of positive and negative pressure due to the vertical transmission of ultrasonic, and bubbles grow and collapse when the pressure reaches a certain value.Numerical analysis for Rayleigh model equation of cavitation bubble was implemented in this paper, to research the effects of parameter changes on the cavitation effect, such as acoustic frequency, acoustic pressure, liquid temperature and liquid viscosity coefficient,etc. and the corresponding changes curve was drawn. Thus the parameter select principles for better cavitation effect has been obtained theoretically, that is lower ultrasound frequency, higher ultrasound power, suitable liquid temperature, and lower liquid viscosity coefficient, conducive to obtain better cavitation effect.The descaling effect of ultrasonic is also affected by actual working condition, fluid parameter, and layout form, etc. In this paper, two-way fluid-structure interaction analysis for condenser model was implemented. In the actual working condition and certain fluid parameter, the impact relationship of different ultrasound incentive location on flow field pressure distribution and the changes trend was researched, the corresponding operations results nephogram was extracted and analyzed, analysis results suggests that changing incentive location can obtained different descaling effects, that is the transducer number and active position have effect on the descaling effect, consequently the optimum descaling results could be achieved through theoretical analysis and simulation study to optimize the transducer number and welding position.