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

Experiment name: Application of power amplifier in the study of microporous piezoelectric ultrasonic atomizer for high viscosity fluid

Experimental equipment:

Laser particle size analyzer, microporous ultrasonic atomizer, electronic balance, experimental lifting platform, signal generator, power amplifier (ATA-4014), oscilloscope, computer

Experimental content:

A micropore piezoelectric ultrasonic atomization effect test system was built, and working fluids including high-viscosity fluids were selected as atomization objects. The effects of liquid surface tension, viscosity, micropore diameter and driving voltage on the droplet size and atomization flow rate of piezoelectric micropore ultrasonic atomization were measured, and the changing trend of the atomization effect was analyzed.

Experimental process:

1. High viscosity fluid microporous piezoelectric ultrasonic atomizer structure;

2. Doppler laser vibrometer experiment;

Determining the optimal driving frequency of a microporous ultrasonic atomizer for high viscosity fluids.

3. Microporous piezoelectric ultrasonic atomization effect test

The electrical signal generated by the signal generator is amplified by the power amplifier, which stimulates the piezoelectric ceramic to produce ultrasonic vibration, causing the microporous piezoelectric atomizer to resonate and deform, so that the liquid in contact with the micropores is squeezed out of the microporous plate under the combined action of inertial force, surface tension and fluid dynamics.

The driving frequency that causes the atomizer to vibrate can be changed by adjusting the frequency of the signal generator output signal; the driving voltage amplitude applied to the atomizer can be changed by adjusting the voltage amplitude of the signal generator output signal and the amplification factor of the power amplifier. The oscilloscope is used to measure the frequency and voltage amplitude of the output signal.

Experimental results:

1. The influence of surface tension on microporous piezoelectric ultrasonic atomization effect;

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

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

4. Effect of driving voltage on microporous piezoelectric ultrasonic atomization effect.

Experimental conclusion:

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

The power amplifier ATA-4014 used in the experiment has the following parameters: