CAJ | 학술논문

通过数值模拟和实验分别研究了点聚焦超声换能器在液体中直接辐照和间接辐照时产生的声场和声化学场分布。研究结果表明，在直接辐照时，数值模拟得到的液体中声压较大位置与声化学反应场位置相一致：在聚焦超声焦点处及液体表面附近。当使用间接辐照时，焦点处声压减小，在试管底与超声换能器之间形成驻波。为了增加间接辐照时容器内的声压，实验使用底端贴有薄膜的双通试管，通过计算机模拟和实验证明在该情况下，容器内声压，特别是容器焦点处声压和声化学反应场有所增强。
통과수치모의화실험분별연구료점취초초성환능기재액체중직접복조화간접복조시산생적성장화성화학장분포。연구결과표명，재직접복조시，수치모의득도적액체중성압교대위치여성화학반응장위치상일치：재취초초성초점처급액체표면부근。당사용간접복조시，초점처성압감소，재시관저여초성환능기지간형성주파。위료증가간접복조시용기내적성압，실험사용저단첩유박막적쌍통시관，통과계산궤모의화실험증명재해정황하，용기내성압，특별시용기초점처성압화성화학반응장유소증강。
In this work, numerical simulation and experimental studies are carried out to investigate the distribution of ultrasonic and sonochemical fields in a liquid induced by the direct or indirect irradiation of a point-focusing ultrasound transducer. Results indicate that the sonochemical reaction fields are consistent with the high amplitude acoustical fields by direct irradiation. High amplitude acoustical fields are observed at the focused point and near the liquid surface. The amplitude of acoustical field is decreased at the focused point when indirect irradiation is used. Standing waves are formed between the bottom glass of tube and the transducer. To enhance the pressure amplitude at the focused point, a film is pasted on the bottom of a double-passing tube. In this case, simulation and experiment results indicate that the acoustical pressure in the tube is increased.