Suspension and trapping particles with a positive contrast factor and investigating the effect of particle volume in a liquid medium by the acoustophoretic phenomenon

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

2 Industrial Design Group, Art Faculty, Alzahra University, Tehran, Iran

Abstract

Ultrasonic suspension can be used for a wide range of particles due to its independence from the material and properties of the material, and has a high potential for the transfer and manipulation of particles in a controlled manner. The main purpose of this paper is to use a new method based on ultrasonic waves, for suspension and non-contact separation of particles from the desired environment. Using this method, called acoustophoretic, the target particle is first injected into the fluid medium and then it is suspended and separated. The environment chosen for suspension and separation is water. The reason for this choice is the novelty of the suspension and separation in this environment due to the higher viscosity and speed of sound of water than air and the proximity of this environment for water purification, separation of water in crude oil and microfluidic scale separation of platelets from blood. The acoustic force must be greater than the resultant of the gravitational and buoyancy force so that it can overcome it and suspend the particle. In order to increase this force it is necessary to increase the acoustic pressure, which is not feasible due to the low frequency in macro scale (20 kHz) and increasing the power consumption of the transducer causes cavitation that prevents the suspension of particles. At this stage, the initial velocity of the particles in the simulation and practical mode was given as 0.4 m / s and the results showed that the largest difference in velocity between the particles with low and high volume was 12.5% ​​in the simulation and 10% in the experiment; Therefore, the larger the particle, the more force it feels and the faster it gets. The largest difference between simulation and experimental test was 8% therefore, experimental tests confirmed the design accuracy and also the simulation results.

Keywords

References

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Iranian Journal of Manufacturing Engineering
Volume 9, Issue 4
July 2022
Pages 12-23

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