Experimental studies on the hydrodynamics, mass transfer and reaction in bubble swarms with ultrafast X-ray tomography and local probe
The experimental project has the objective to clarify essential aspects of bubble swarm hydrodynamics, bubble interface dynamics, mass transfer and reaction by employing new high-resolution and dynamic imaging and measurement techniques and thereby contributing to close the knowledge gap in the, predominantly mesoscalic, modeling of transport and reaction processes in bubble flows. As measurement techniques we use ultrafast X-ray tomography for elucidation of flow structure, bubble sizes, bubble shapes, bubble swarm dynamics and interface dynamics, as well as X-ray assisted hot wire anemometry for liquid velocity and turbulence, CO2 and Raman probes for species concentration measurement. The planned work in the first funding period concentrates on hydrodynamics of dense bubble swarms and reaction of a simple reaction system, namely 2 NaOH + CO2 to Na2CO3 + H2O. Experiments will be run in a bubble column with variable gas injector. Methodological prerequesites for future work with other organic liquids will be developed. The work is in close cooperation with experimental and numerical partner groups of the priority programme to ensure complementarity of experimental work and wide use of experimental data for modeling and numerical simulation.