Ultrasound is used to improve efficiency in process engineering. The operating parameters of ultrasound systems are typically determined empirically, as there is currently no systematic analysis of the interaction between the ultrasonic transducer and the sound field, nor is there a method for measuring cavitation activity without an additional sensor.

As part of his doctoral dissertation, Dr Peter Bornmann (Dr.-Ing.) developed a finite-element model based on an experimental analysis of the sonochemical reactor under consideration, which takes into account the interaction between the acoustic field and the ultrasonic transducer. The model-based analysis shows that, due to the acoustic properties of the autoclave, cavitation occurs only directly at the sonotrode. The interaction between the ultrasonic transducer and the sound field allows conclusions to be drawn about the sound field and cavitation activity based on the feedback effect on the ultrasonic transducer. The linear sound pressure distribution allows the distribution of cavitation zones to be predicted. The model described provides valuable insights for the design, analysis and scaling of sonochemical reactors.

Due to the harsh process conditions, it is not possible to use sensors to monitor cavitation activity in many sonochemical processes. To enable the in-process measurement of cavitation activity, Dr. Bornmann has therefore developed a method that allows the assessment of cavitation activity by analysing the feedback effect on the ultrasonic transducer. This measurement method enables the predictable and reproducible execution of cavitation-based processes and represents an important enhancement for both existing and new ultrasonic systems.