超声空化对污垢沉积特性影响的数值研究

在超声波防垢过程中，超声波的传播以及空化效果会受到流体及超声波参数的影响，析晶污垢的沉积特性也会随之发生变化。对此，采用FLUENT数值模拟与实验参数相比对的方法研究了不同流体速度、超声波频率下超声空化对CaSO₄析晶污垢剥蚀的影响。结果表明：同频率条件下，增大流速超声空化对污垢的剥蚀效果减弱；同流速条件下，增大超声波频率超声空化对污垢的剥蚀效果减弱。将空化效应引起的剥蚀率代入污垢的沉积过程，得到超声波频率对污垢沉积特性的影响，随着超声波频率的增加，污垢净沉积率增加、污垢热阻变大。

Simulation study on influential of ultrasonic cavitation on fouling deposition characteristic

In the process of ultrasonic antiscaling,the spread of ultrasonic and cavitation effect will be affected by the fluid and ultrasonic parameters,deposition character of crystallization fouling will also be changed. Thus,using the method of the FLUENT software numerical simulation compared with the experimental parameters,the effect of ultrasonic cavitation on CaSO₄ crystallization fouling removal is studied in the different fluid velocity and the ultrasonic frequencies. Results show that under the conditions of the same frequency,increasing velocity of fluid,the removal effect of ultrasonic cavitation on fouling is weakened. The removal rate caused by cavitation effect was brought into the fouling deposition process,and the effect of ultrasonic frequencies on the fouling character was obtained. With the increase of ultrasonic frequencies,fouling net deposition rate and fouling resistance increased.