Lupine Publishers| Journal of Robotics and Mechanical Engineering
In this paper, the
influences of Magnus force on the behaviour of small particles inside a
microfluidics- based device are theoretically investigated. The Magnus force is
a lift force, which is caused by the rotation of particles within fluid flow.
Explicit relations are presented for calculating the Magnus force exerted on
small particles inside fluid flow with small Reynolds numbers. Moreover, the
effects of the radius of a particle on the Magnus force are discussed. The
obtained results and formulation would be helpful in the design of inertial
microfluidics-based devices.
Keywords: Inertial Microfluidics; Particle Separation; Magnus Force; Microsystems
Introduction
Microtechnology and
nanotechnology [1-8]. have many promising applications in various areas of
science and medicine. Particularly, in medicine, novel diagnosis and treatment
techniques have been introduced using microscale and nanoscale devices [9].
These techniques are ultra-fast, portable, less costly and easy to use compared
to traditional techniques [10]. In addition, in engineering, microscale
structures [11-23]. and nanoscale structures [24-31]. have been utilized to
fabricate microscale and nanoscale devices such as ultra small actuators,
sensors and energy harvesters. Among different microscale systems, inertial
microfluidics-based devices have attracted much interest from scientific
communities due to their potential for the separation of particles and fluids
at ultra-small levels. When a particle travels inside the channel of a
microfluidics-based device, it is subject to several forces such as drag,
diffusion, Saffman and Magnus forces. In this paper, Magnus force, as one of
important forces in a group of microfluidics-based devices, is investigated. A
mathematical explicit relation is given for the Magnus force. Furthermore, the
effect of particle radius on the Magnus force is studied in detail.
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