ANALYSIS OF COMPLEX SPIRAL VORTEX FIELD IN NANO PARTICLE CONCENTRATION

摘要：

　　A strategy to concentrate nanoscale particles on the interface between a nano suspension droplet and non-vibration substrate is demonstrated and analyzed.It employs the spiral vortex of acoustic streaming, generated by an ultrasonically vibrating needle parallel to and above the non-vibration substrate.The vortex drags nanoscale particles to the center of itself, forming a concentration spot.For 250nm-diameter SiO2 nano particle suspension with an initial concentration of 0.09 mg/ml, the diameter of the concentration spot can be up to several hundred microns.The dependency of the spiral vortex field on the vibration distribution of the acoustic needle immersed in the droplet is also clarified by experiments and simulation of the COMSOL Multiphysics FEM software, and the concentration conditions are obtained by analyzing the nano particle dynamics in the spiral vortex.

关键词： Nano particle concentration Complex spiral vortex Acoustic streaming FEM Particle dynamics

作者: Qiang TANG Jun-hui HU

作者单位: State Key Lab of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics,Nanjing, P.R.China, 210016

会议类型: 国际会议

会议名称: The 2017 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2017全国压电和声波理论及器件技术研讨会)

会议地点: 成都

会议语种:英文

页码: 367-371

在线出版日期: 2017-10-27（万方平台首次上网日期，不代表论文的发表时间）