【摘要】 采用厚度为1 mm、边长为200 mm的方形镜面钢板,将一对间隔2.4 mm的单相压电换能器固定于钢板表面,结合驱动电路激发频率为1 MHz的兰姆波。研究了兰姆波在倾斜钢板上驱动油水分离过程,进而对油水分离的瞬时速度进行分析。结果表明,影响分离瞬时速度的3个主要因素,换能器两端的峰电压对油水分离起着主要作用;当峰电压和油水混合比不变时,倾斜角越大,则油水分离瞬时速度越大;当钢板倾斜角不变时,在相同的输入电压下,油水比越小,分离速度相对越大。与现有方法相比,兰姆波驱动法的优点在于,采用声波以非接触的方式驱动微流体对油水进行分离,且分离速度最快可以达到180 mm/s。更多还原

【Abstract】 A pair of single-phase transducer was glued on the 1 mm thick and 200 mm side length of the square steel substrate at a distance of 2.4 mm,the lamb wave with frequency of 1 MHz was stimulated by drive circuit. The oil-water separation process and the instantaneous velocity was studied and analyzed on the inclined steel plate driven by lamb wave. The results showed that there were three factors influence the oil-water separation progress,and the peak voltage of transducer played a major role in oil-water separation among them. When peak voltage and oil-water mixing ratio were unchanged,the bigger the slant angle, the higher the oil-water separation instantaneous velocity. When inclination of steel substrate was unchanged, the low mixing ratio, the higher the oil-water separation velocity under the same input voltage. Compared to existing oil-water separation methods, the lamb wave has the advantage of separating microfluids in a non-contact way and the separation velocity can reach speeds as high as 180 mm/s.更多还原