Vergleich des Stofftransports von hängenden und akustisch levitierten Wassertropfen in CO2

High‐pressure acoustic levitation devices allows a contact‐free investigation of liquids. Here, acoustically levitated water droplets and pendant water droplets were examined in regards to the mass transfer coefficient in a static CO₂‐atmosphere under elevated pressures. Based on the droplet geometry and the decrease of the droplet volume over time, it was possible to calculate the mass transfer coefficient of water into CO₂ at any given time. Additionally, open questions regarding possible differences between pendant and acoustically levitated water droplets were discussed.     

Druckstandfestigkeit und Betriebseigenschaften von Doppelwellendichtungen

The strength and operating properties of wave‐ring gaskets are analyzed. A cylindrical shell of constant mean thickness is introduced to simulate the gasket. It is assumed that the shell is simply supported at the inner surface of the seat. The influence of certain geometric, material and assembly parameters on the strength and leak‐tightness of the closure is investigated. The results are illustrated by a numerical example. For the assumed material of the gasket and several fixed data the other parameters of the closure are examined. The region of admissible solutions for the gasket parameters such as dimensions, applied assembly clearance and pressure is determined.     

Virtualisierung verfahrenstechnischer Prozesse – Experimentiertechnik in der Lehre

In this article, junior professor Sulamith C. Frerich from the Ruhr University Bochum (RUB) introduces herself. She provides insight into current research issues and shows how she combines university tasks with non-university research. She reports from plastics characterization and processing as well as numerical simulation and process optimization. She gives two examples for application-oriented composite production from polymers and active ingredients and describes how she designs the transfer. In addition, she explains how online teaching works in process engineering.