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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
Published on: August 27, 2013
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Diversity of acoustic streaming in a rectangular acoustofluidic field
1State Key Lab of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Ultrasonics
|December 27, 2014
Summary
Acoustic streaming patterns in water are diverse and controllable by adjusting vibration sources and temperature. Numerical simulations reveal how parameters like frequency and object presence influence fluid flow dynamics.
Area of Science:
- Fluid dynamics
- Acoustics
- Computational physics
Background:
- Acoustic streaming, the steady fluid flow induced by sound waves, is crucial in microfluidics and particle manipulation.
- Understanding the factors influencing acoustic streaming patterns is essential for optimizing device performance.
Purpose of the Study:
- To numerically investigate the diversity of acoustic streaming fields in a 2D rectangular chamber.
- To explore the effects of various parameters on acoustic streaming patterns and fluid behavior.
Main Methods:
- Finite element method (FEM) simulations using COMSOL Multiphysics.
- Numerical investigation of a 2D rectangular chamber with a traveling wave in water.
- Parametric study involving working frequency, vibration source characteristics, and temperature.
Main Results:
- Acoustic streaming patterns are significantly influenced by working frequency, vibration source length, and source separation/phase.
- Introduction of a small object into the acoustic field creates additional eddies and modifies existing ones.
- Water temperature affects acoustic streaming speed and corner eddy angular velocity due to changes in acoustic dissipation and viscosity.
Conclusions:
- The study demonstrates controllable diversity in acoustic streaming fields through parameter manipulation.
- The findings provide insights into acoustic streaming behavior, particularly the impact of temperature and object presence.
- The FEM approach offers a user-friendly and verifiable method for simulating acoustic streaming phenomena.
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