摘要
分析表明,超声空化泡崩溃时的高温声冲流和高压冲击波是使塑料致热熔融的机制.采用圆锥形和圆柱形玻璃管对单束超声空化场聚束喷射时,致热速率明显加大,这是因为空化泡在声辐射压力作用下聚集于喷射空化场前峰区的密度得以提高,因而增强了空化集中的致热效果.
This paper believes that the heating mechanism of plastics in a jetting ultrasonic cavitation field owes the high temperature stream and high pressure shock wave while doing the implosion of the cavitation bubbldes in the field. While the field being gatheved with a cylindrical or cylindroconical glass tube,the heating rate rises apparently,and which is beleived to come from the ultrasound radiating pressure that drivec the much bubbles to the front of the jetting field and making a higher density of bubble there,therefore an enhanced cavitation concentrating effect intends to occure at the field front.
基金
国家自然科学基金
