分析了旋流产生的机制及其驱动微粒运动的机理,建立了颗粒在旋流中的力学模型.以微米级的颗粒(几微米到几百微米)为例,分析了两支微管对向喷射所产生的旋流场的特点和颗粒在旋流场中的受力情况以及运动特点和运动规律.讨论了颗粒的尺寸、形状、位置变化对其旋转性能的影响,并通过实验验证了提出方法的可行性.分析和实验表明:两支平行微管相对喷射可以产生旋流,旋流可以驱动颗粒在其流场内稳定旋转.颗粒在旋流场内的运动性能与流场参数和微粒的形状、尺寸、偏心有关,减小颗粒的初始位置的偏心,减少公转成分,有利于颗粒姿态的捕捉和调整.即使颗粒参数变化,合理匹配流场参数,提出的方法仍然可以可以稳定地驱动颗粒转动.

How to generate a swirl and how to drive the particle movement by the swirl were analyzed.Then,a mechanics model of particles in the swirl was established. By taking the micro-level particles(microns to hundred microns)as examples,the characteristics of the rotary flow field generated by two ejecting micro tubes which were parallel placed and the force condition and movement characteristics of the particles in the rotary flow field were analyzed.The influences of different particle sizes,shapes and changed positions on the rotation performance of the particles were discussed,and an experiment was performed to verify the feasibility of swirl method.The analysis and experiments show that the swirl can be generated by two ejecting micro tubes which were parallel placed.And the swirl can drive the micro particles to rotate in the flow field stablely. The movement characteristics of the particles in the flow field are dependent on the flow parameters and particle shapes,particle sizes and the eccentricity.When the eccentric of initial position and the revolution of the particles are reduced,it will be conducive to capturing and adjusting the attitudes of particles.Even though the particle parameters are changed,the method still can drive the particle rotated in stability by reasonable matching these parameters.