The intensification of physicochemical processes in the sonochemical reactor chamber is widely used in problems of synthesis,extraction and separation.One of the most important mechanisms at play in such processes is ...The intensification of physicochemical processes in the sonochemical reactor chamber is widely used in problems of synthesis,extraction and separation.One of the most important mechanisms at play in such processes is the acoustic cavitation due to the non-uniform distribution of acoustic pressure in the chamber.Cavitation has a strong impact on the surface degradation mechanisms.In this work,a numerical calculation of the acoustic pressure distribution inside the reactor chamber was performed using COMSOL Multiphysics.The numerical results have revealed the dependence of the structure of the acoustic pressure field on the boundary conditions for various thicknesses of the piezoelectric transducer.In particular,the amplitude of the acoustic pressure is minimal in the case of absorbing boundaries,and the attenuation becomes more significant as the thickness of the piezoelectric transducer increases.In addition,reflective boundaries play a significant role in the formation and distribution of zones of maximum cavitation activity.展开更多
低强度脉冲超声(Low-Intensity Pulsed Ultrasound,LIPUS)作为一种可用于治疗骨病的潜在物理疗法,可以有效避免药物的不良反应,且具有无创伤、无电离辐射等优点,因而有着广阔的应用前景。应用有限元法(Finite Element Method,FEM)仿真研...低强度脉冲超声(Low-Intensity Pulsed Ultrasound,LIPUS)作为一种可用于治疗骨病的潜在物理疗法,可以有效避免药物的不良反应,且具有无创伤、无电离辐射等优点,因而有着广阔的应用前景。应用有限元法(Finite Element Method,FEM)仿真研究LIPUS照射骨细胞时的局部声场分布,从微观角度探究骨细胞与声场间的相互作用以及各超声参数和照射位置对于声场分布的影响。首先建立了骨细胞模型,然后在不同位置施加超声激励并改变超声的激励声压与频率,计算不同情况下的声场分布,最后对仿真结果进行综合分析与比较。结果表明,骨细胞会在一定程度上影响声场的分布,且超声的各个参数及照射位置均对声场有一定的影响。仿真结果从声压与能量的角度阐述了LIPUS治疗骨病的潜在物理机制,另一方面也为离体细胞实验中LIPUS的参数筛选和照射方式提供理论参考。展开更多
文摘The intensification of physicochemical processes in the sonochemical reactor chamber is widely used in problems of synthesis,extraction and separation.One of the most important mechanisms at play in such processes is the acoustic cavitation due to the non-uniform distribution of acoustic pressure in the chamber.Cavitation has a strong impact on the surface degradation mechanisms.In this work,a numerical calculation of the acoustic pressure distribution inside the reactor chamber was performed using COMSOL Multiphysics.The numerical results have revealed the dependence of the structure of the acoustic pressure field on the boundary conditions for various thicknesses of the piezoelectric transducer.In particular,the amplitude of the acoustic pressure is minimal in the case of absorbing boundaries,and the attenuation becomes more significant as the thickness of the piezoelectric transducer increases.In addition,reflective boundaries play a significant role in the formation and distribution of zones of maximum cavitation activity.
文摘低强度脉冲超声(Low-Intensity Pulsed Ultrasound,LIPUS)作为一种可用于治疗骨病的潜在物理疗法,可以有效避免药物的不良反应,且具有无创伤、无电离辐射等优点,因而有着广阔的应用前景。应用有限元法(Finite Element Method,FEM)仿真研究LIPUS照射骨细胞时的局部声场分布,从微观角度探究骨细胞与声场间的相互作用以及各超声参数和照射位置对于声场分布的影响。首先建立了骨细胞模型,然后在不同位置施加超声激励并改变超声的激励声压与频率,计算不同情况下的声场分布,最后对仿真结果进行综合分析与比较。结果表明,骨细胞会在一定程度上影响声场的分布,且超声的各个参数及照射位置均对声场有一定的影响。仿真结果从声压与能量的角度阐述了LIPUS治疗骨病的潜在物理机制,另一方面也为离体细胞实验中LIPUS的参数筛选和照射方式提供理论参考。
