Interaction of bubbles in bubble swarms
Sign:
So 204/19-1
Title:
Analysis and modelling of the interactions of bubbles in a bubble swarm
Head:
Prof. Dr.-Ing. M. Sommerfeld
Keywords:
interactions, bubble swarm, bubble coalescence, ~ collision and ~ decay
Realizer:
Dr. rer. nat. M. Göz
Dr. (PhD) S. Lain
Dipl.-Ing. D. Bröder
Description:
The priority of this research project is the analysis and the modelling of the interactions of bubbles in a bubble swarm. The partial processes of hydrodynamic interactions, bubble collision and ~ coalescence as well as bubble decay should be considered. Because the Euler/Lagrange approach is used for the calculation of the bubbly flow, a very detailed model development can be applied. The models for bubble coalescence and ~ decay should be based on existing knowledge. But, for the evaluation and validation of these two models detailed experiments in a double loop reactor, in which an intensive interaction between the bubbles could be realized, are necessary. The flow will be analysed with a picturing PIV/PTV method which was developed in the preceding project. The modelling of hydrodynamic interactions between bubbles in a swarm demand tests of the interactions between two and more bubbles using direct numerical simulations to obtain modified drag coefficients. Besides, the behaviour of polydisperse bubble swarms should be analysed using direct numerical simulations. Experiments in a labor bubble column are planned to obtain additional experimental information about the behaviour of bubble clusters, whereas the clusters will be followed in time.
Bubbles in swarm: left single bubble; right a swarm of bubbles