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High-frequency, silicon-based ultrasonic nozzles using multiple Fourier horns
Shirley C Tsai1, Yu L Song, Terry K Tseng
1Institute for Applied Science and Engineering Research, Academia Sinica, Taipei 115, Taiwan. sctsai@phys.sinica.edu.tw
Summary
This study details microfabricated ultrasonic nozzles using silicon and piezoelectric materials. The novel design amplifies vibration amplitude at the nozzle tip, reducing power needs and enhancing durability for atomization applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Acoustics
Background:
- Ultrasonic nozzles are crucial for atomization processes.
- Existing designs face limitations in vibration amplitude and power efficiency.
- Microfabrication offers potential for enhanced nozzle performance.
Purpose of the Study:
- To design, simulate, and characterize novel microfabricated ultrasonic nozzles.
- To investigate the impact of Fourier horns on vibration amplitude.
- To reduce power requirements and improve the reliability of ultrasonic atomizers.
Main Methods:
- Finite element 3-D simulation was employed to predict resonant frequencies and vibration modes.
- Impedance analysis and longitudinal vibration measurements were used for characterization.
- Microfabrication techniques were utilized to create silicon-based piezoelectric nozzles.
Main Results:
- A single resonant frequency with pure longitudinal vibration was identified, matching simulation predictions.
- Measured vibration amplitude at the nozzle tip increased with the number of Fourier horns, aligning with theoretical predictions (2^n).
- The design achieved significant vibration amplitude gain without reducing the liquid contact area.
Conclusions:
- The microfabricated silicon-based ultrasonic nozzle design effectively amplifies vibration amplitude.
- This amplification leads to reduced electric drive power requirements for ultrasonic atomization.
- The enhanced design promises increased transducer longevity and improved atomization efficiency.