Offene Abschlussarbeiten
Charakterisierung von Ringspaltströmungen mittels Ultraschall
Numerical and analytical investigation of slender resonators
2026/07/24
Masterthesis, Bachelorthesis
The behavior of two-phase flows in narrow annular gaps is highly relevant to numerous technical applications. Even small gas fractions can significantly affect the characteristic flow behavior as well as the static and dynamic forces exerted by the annular gap flow on a rotating shaft. Experimentally investigating these effects requires accurate knowledge of the local gas volume fraction and the prevailing bubble sizes. However, suitable measurement methods are currently available only to a limited extent at the existing test rigs.
This thesis will therefore initially investigate whether ultrasonic transducers are suitable for characterizing two-phase flows in narrow flow channels using a simplified experimental setup that is to be designed and constructed specifically for this purpose. Ultrasonic pulses will be generated, and their propagation through a defined gas–liquid flow will be analyzed. Based on the measured time of flight, reflections, and attenuation characteristics, the extent to which the local gas volume fraction, known as the void fraction, can be determined at least approximately will be investigated. Furthermore, the study will examine whether conclusions regarding the characteristic bubble size can be drawn from the ultrasonic signals. Finally, the findings will be evaluated with regard to the future transferability of the measurement principle to existing test rigs for investigating two-phase flows in narrow annular gaps.
Supervisor: Dr.-Ing. Maximilian Kuhr
Experimentelle Untersuchung von Pumpenverschleiß in partikelbeladenen Medien
Experimental analysis of pump wear in particle laden fluids
2026/06/16
