Airborne Power Ultrasonic Transducers with Stepped Circular Radiator for Lyophilization at Atmospheric Pressure
Proceedings of meetings on acoustics(2019)
摘要
The application of airborne power ultrasounds to enhance freeze drying processes has become a promising, green and efficient technology. It has been proved that this technology accelerates drying kinetics obtaining a good quality final product. The effectiveness of this process comes from the generation of a high-intensity ultrasonic field by an airborne power ultrasonic transducer (APUT) with an extensive radiator. A stepped circular plate, vibrating flexurally with seven nodal circles, has been used for this purpose. Its use allows a good impedance matching with the gas media because of the high surface of the radiator; and a coherent ultrasonic field due to the steps applied in the surface of the radiator and the high vibration amplitude of this surface.
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