Investigation of dynamic flow processes in pipes by ultrasonic techniques

Speaker:
Hillmann, Susanne; Fraunhofer IKTS; Germany

Authors:
Barth, M.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Bor, Z.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Brosius, D.M.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Hillmann, S.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Sander, W.; ArianeGroup GmbH; Germany
Souverein, L.; ArianeGroup GmbH; Germany

ID: ECNDT-0355-2018
Session: Process Control 2
Room: R2
Date: 2018-06-12
Time: 13:50 - 14:10

In-situ measurements of streaming media in pipes or vessels can be performed by integrated sensors. These sensors then have direct contact to the fluid. This approach is impossible when the pipes are too small or the fluid is too aggressive for the sensor. The approach is also not suitable to investigate dynamic flow processes as the sensor would disturb the flow field. In those cases the fluid stream shall be monitored indirectly from outside. Ultrasonic methods are well suited for this task.

The properties of inner structures can be characterized by ultrasonic techniques using either properties of the sound wave, such as the sound velocity, damping or scattering effects. In addition, the existence, size and velocity of small air bubbles inside the fluids can be detected. Using these information, the streaming medium inside the pipe system can be characterized. To achieve this, either continuous or fast pulsed ultrasonic signals have to be applied to the structure. A robust and temperature stable hardware system consisting of sensors and electronics is required. The software must analyze the ultrasonic data in real-time, perform data reduction and find a parameter representation, calculated from processed ultrasonic raw data and suitable for the characterization of the streaming medium.

In this article, results of a feasibility study with pipes of very thin inner diameter are presented. A suitable ultrasonic laboratory system for monitoring dynamic processes has been developed. In addition, suitable parameters for detecting different properties of the streaming medium are identified. Based on these results, an ultrasonic system for the characterization of dynamic processes in flowing media can be developed.