Abstract
The microfluidic chip can be used to separate particles via the acoustic radiation force and can be applied to the separation of impurity particles from lubricating oil. A device that separates particles by controlling the acoustic radiation force via standing surface acoustic waves (SSAWs) was proposed. The concentration and separation of suspended particles were simulated by using the COMSOL Multiphysics modeling software. The force exerted on suspended particles and their subsequent motion in the microfluidic channel were analyzed, and then the concentration of particles exposed to SSAWs was verified. We also investigate how the frequency of the SSAW affects the particle concentration and discuss the advantage of using SSAWs to concentrate and separate particles. The separating feasibility was verified by suspended particles in lubricating oil experiments according to simulation results.
Highlights
The lubricating oil can form a protective oil film over a mechanical friction surface, which greatly reduces friction, leading to a reduced operating temperature of the mechanical equipment
According to the microfluidic channel parameters used in the numerical simulation results shown inFig. 12, to verify the particle separation results of the SAW standing wave field with only one node, the width of the microfluidic channel 500 μm was taken as half of the wavelength
Traditional methods can remove particles suspended in lubricating oil to some extent, they are inadequate for purifying lubricating oil for large-scale precision machinery equipment
Summary
The lubricating oil can form a protective oil film over a mechanical friction surface, which greatly reduces friction, leading to a reduced operating temperature of the mechanical equipment. In view of the deficiencies of these separation methods, a method has recently emerged that uses the transverse acoustic radiation force generated by an ultrasonic standing wave field to move suspended particles in a continuous fluid to implement continuous separation of the particles. King first discussed the movement of particles by the acoustic radiation force generated by an ultrasonic standing wave field. They obtained an expression for the acoustic radiation force exerted on particles in a traveling-wave field or standing wave field These results have been widely used in the separation and extraction of medical and pharmaceutical ingredients. The feasibility of particle separation and experiment when exposed to standing surface acoustic waves (SSAWs) is verified, and the relationship between frequency and particle separation is obtained
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