Experiment name: Application of power amplifier in the research of ultrasonic atomizer for high viscosity fluid

Testing equipment: laser particle size analyzer, microhole ultrasonic atomizer, electronic balance, experimental lifting platform, signal generator, power amplifier (SLA-HVP-452), oscilloscope, and computer.

Experimental content: A microporous piezoelectric ultrasonic atomization effect test system was built. Working fluids including high-viscosity fluids were selected as atomization objects. The effects of the liquid’s surface tension, viscosity, micropore diameter and driving voltage on the piezoelectric micron atomization were measured. The influence of droplet size and atomization flow rate of hole ultrasonic atomization was analyzed, and the changing trend of atomization effect was analyzed.

Experiment procedure:
1. High viscosity fluid microporous piezoelectric ultrasonic atomizer structure.

2. Doppler laser vibration measurement experiment; determine the optimal driving frequency of micropore ultrasonic atomizer for high viscosity fluid.

3. The electrical signal generated by the microporous piezoelectric ultrasonic atomization effect test signal generator is amplified by the power amplifier and excites the piezoelectric ceramic sheet to generate ultrasonic vibration, causing the microporous piezoelectric atomization sheet to resonate and deform, causing it to interact with the micropores. The liquid in contact is extruded from the microplate under the combined action of inertial force, surface tension and hydrodynamic force.
By adjusting the frequency of the signal generator’s output signal, the driving frequency that causes the atomizer piece to vibrate can be changed; by adjusting the voltage amplitude of the signal generator’s output signal and the amplification factor of the power amplifier, the driving voltage amplitude applied to the atomizer piece can be changed. An oscilloscope is used to measure the frequency and voltage amplitude of the output signal.

Experimental results:
1. The influence of surface tension on the atomization effect of microporous piezoelectric ultrasonic;

2. Effect of viscosity on microporous piezoelectric ultrasonic atomization effect;

3. The influence of micropore diameter on micropore piezoelectric ultrasonic atomization effect;

4. The effect of driving voltage on the microporous piezoelectric ultrasonic atomization effect.

The high-viscosity fluid microporous piezoelectric ultrasonic atomizer is a new atomization device that can meet the needs of atomizing high-viscosity fluids in the agricultural and industrial fields.