discovered_01_2015

discovered 01.15 FOCUS WWW.HZDR.DE In order to really visualize what is happening inside the reactor, Hans-Ulrich Härting had to get together with the measuring technology experts in his department to develop a mobile, compact computer tomograph. As it rotates around the reactor, gammy-rays penetrate the flow and are more or less attenuated depending on whether they hit gas or liquid. Based on the intensity of the radiation that is measured on the other side of the reactor, scientists can generate sectional images of the flow, similar to medical imaging. Next step: simulations The two scientists have already submitted a follow-up application for a research grant because they want to conduct further studies with their reactor. The next step will be to start examining the impact of the novel operating system on undesired byproducts in complex reactions. They also want to simulate and model different flow regimes. ‘If we can get this to work, it will be easier to transfer our results to other processes,’ Markus Schubert says. PUBLICATIONS: H.-U. Härting et al.: ‘Liquid backmixing in an inclined tubular fixed-bed reactor – Augmenting liquid residence time via flow regime adjustment’, in Chemical Engineering and Processing: Process Intensification 2015 (DOI: 10.1016/j. cep.2015.02.003) H.-U. Härting et al.: ‘Hydrodynamics of co-current two-phase flow in an inclined rotating tubular fixed-bed reactor - Wetting intermittency via periodic catalyst immersion’, in Chemical Engineering Science 2015 (DOI: 10.1016/j.ces.2015.02.008) TILTED: The inclination of the fixed-bed reactor can be adjusted at will – the distribution of liquids and gas can thus be controlled systematically. Photo: Oliver Killig CONTACT _Institute of Fluid Dynamics at HZDR Hans-Ulrich Härting h.haerting@hzdr.de

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