Transducers gas-driven

Neither type of transducer has any significant chemical application because it is not possible to achieve a sufficiently high intensity in airborne ultrasound by this method. Despite this, applications do exist for airborne ultrasound but the source must be very powerful - usually a sonic horn. In this way one can obtain intensities of a fraction of a 

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The gas-driven transducers are simply whistles with high frequency output. Dog whistles and sirens can be given as the two examples of gas-driven transducers. These transducers can be used to break down foams and agglomerates of dust and for the acceleration of drying processes. However, these types do not have any significant chemical applications, as it is not possible to achieve a sufficiently high-pressure intensity in airborne ultrasound by this method. 

In sonochemistry, physical and chemical changes are brought about by the usage of power ultrasound. Three types of transducers are used to generate power ultrasound gas driven transducers, liquid driven... 

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