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Ultrasound focuser: A multi-cylindrical source configuration and entrapped particles dynamics
Majid Rajabi1, Alireza Mojahed2, Aria Hajiahmadi1
1Sustainable Manufacturing Systems Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran.
Ultrasonics
|May 13, 2019
Summary
This study introduces a 3D ultrasound focuser for precise particle manipulation. The non-invasive acoustic system enables cell entrapment and targeted delivery, offering a robust and versatile solution.
Area of Science:
- Acoustic physics
- Biomedical engineering
- Microfluidics
Background:
- Acoustic manipulation offers non-invasive methods for microparticle control.
- Existing 3D focusing techniques often require complex setups or specific channel designs.
Purpose of the Study:
- To present a proof of concept for a 3D ultrasound focuser.
- To explore its applications in cell entrapment, particle focusing, and targeted delivery systems.
Main Methods:
- Analytical derivation of acoustic radiation force on particles.
- Stability analysis of entrapped particle dynamics using Stokes equations.
- Numerical computation of particle migration trajectories.
Main Results:
- Formation of an attracting zone around the triangular prism axis when sources have a π/3 phase difference.
- Optimal focusing achieved when acoustic wavelength (λ) approximates source separation (l).
- Estimation of settling time and length scales for particle focusing.
Conclusions:
- The proposed 3D ultrasound focuser is non-invasive, robust, and easy to implement.
- It is applicable to various micro-particles without pre-designed channels.
- Demonstrates potential for advanced applications in cell manipulation and drug delivery.
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