管道类型对超声波防垢影响的数值研究

Numerical Study for the Influence of Pipeline Type on Ultrasonic Scale Prevention

超声波应用在换热设备中已表现出显著的防垢性能,而超声空化作用又是防垢主要因素。采用数值方法对管内超声空化流场进行模拟,研究在超声波作用下圆管、横纹管、波纹管内析晶污垢的沉积过程,并引入实验除垢率对析晶污垢剥蚀率进行修正,进而对不同管内析晶污垢沉积特性进行对比探究。结果表明:超声波对横纹管的防垢效果最佳、对波纹管的防垢效果最差。因此,本研究将为工程中采用超声波防垢时对于管道类型的选择提供一定的参考依据。

Ultrasonic application in heat exchanger equipment has shown a significant scale-inhibiting capacity and ultrasonic cavitation is the main factor for the scale prevention. The internal flow field of ultrasonic cavitation was simulated numerically and the deposition process of crystallization fouling in pipe,transversely-ridged tube and bellows under the ultrasonic effects was examined. The crystallization fouling removal rate by experimental descaling efficiency was used to compare and investigate the deposition character of different internal fouling. Results demonstrated that scale prevention effect of ultrasonic is the best for transversely-ridged tube and the worse for bellows. This study is expected to provide a reference for selecting the pipeline type in the scale prevention adopting ultrasonic approach.