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Name of Experiment：Application of power amplifier in the study of ultrasonic atomizer for high viscosity fluid

Experiment Equipment：laser particle size analyzer, microhole ultrasonic atomizer, electronic balance, experimental lifting platform, signal generator, power amplifier (ATA-4014), oscilloscope, computer.

Experiment Contents：a test system for the effect of piezoelectric micropore ultrasonic atomization was built. Working fluids including high viscosity fluids were selected as atomization objects. The effects of surface tension, viscosity, micropore diameter and driving voltage on droplet size and atomization flow rate of piezoelectric micropore ultrasonic atomization were measured, and the changing trend of atomization effect was analyzed.

Experiment Process：

1.Structure of high viscosity fluid microporous piezoelectric ultrasonic atomizer

2.Doppler laser vibration measurement experiment

To determine the optimal driving frequency of high viscosity fluid microporous ultrasonic atomizer.

3.Effect test of microporous piezoelectric ultrasonic atomization

The electric signal generated by the signal generator is amplified by the power amplifier, and the piezoelectric ceramic plate is excited to produce ultrasonic vibration, which causes resonance and deformation of the microporous piezoelectric atomized plate, so that the liquid in contact with the microporous plate is extruded from the microporous plate under the joint action of inertial force surface tension and fluid power.

By adjusting the frequency of the output signal of the signal generator, the driving frequency causing the vibration of the atomizer can be changed. By adjusting the voltage amplitude of the output signal of the signal generator and the magnification of the power amplifier, the driving voltage amplitude applied on the atomizer can be changed. The oscilloscope is used to measure the frequency and voltage amplitude of the output signal.

Experimental Result：

1.Effect of surface tension on ultrasonic atomization of micropores

2.Effect of viscosity on ultrasonic atomization of microporous piezoelectric

3.Effect of micropore diameter on micropore piezoelectric ultrasonic atomization

3. Effect of driving voltage on ultrasonic atomization of microporous piezoelectric.

Experiment Result：

High viscosity fluid microporous piezoelectric ultrasonic atomizer is a new type of atomizing device that can meet the needs of high viscosity fluid atomization in agriculture and industry.