Lecture Topics：Multiphase flow measurement with advanced imaging techniques
Speaker: Prof. Uwe Hampel German HZDR Research Institute/Dresden University of Technology
Lecture time: September 24, 2019 (Tuesday) 9:00 am
Lecture Venue: 303, School of Energy and Power Engineering
Multiphase flows are widely found in different fields of science, engineering, and industry. Examples are mineral oil processing, chemical reaction engineering, and nuclear thermal hydraulics. Measurement and visualization of multiphase flows is therefore of high scientific and engineering relevance. In particular the development of multiphase CFD codes requires measurement data from flow scenarios with high spatial and temporal resolution, in order to develop and validate physics based models for momentum, heat and mass transfer. If information about phase distributions, interfacial area structure, velocity and species concentration fields in flows are required, high-resolution imaging modalities are needed as measurement tools. However, yet there is no universal measurement or imaging modality for multiphase flow. Traditional visualization tools, such as high-speed camera imaging and ultrasound measurements fail in multiphase systems due to the nonlinear propagation and attenuation of the signal carriers, e.g. light and sound waves. Especially radiation based tomographic methods are therefore being considered as the key technology for multiphase flow visualization. However, to date only few methods are suited because of the stringent requirements for high spatial and temporal resolution. In particular, methods are sought, which can visualize multiphase flow in complex geometries, often with opaque walls and inserts, such as chemical reactor vessels, heat exchangers or nuclear fuel rod assemblies, but also porous media of fixed bed reactors or rock samples. The presentation introduces two novel imaging modalities, namely wire mesh sensors and ultrafast X-ray tomography and their use in two-phase flow measurement in complex flow domain geometries. It will be shown how gas-liquid and gas-solid flows can be visualized in in pipes, columns, fixed bed packings and flow channels with inserts. The presentation shows results of dedicated flow studies and introduces data analysis methods for extraction of quantitative flow parameters.
1994-1997 Doctoral student at Institute of Biomedical Engineering, Technische, Universität Dresden; Topic: Image Reconstruction for Optical Tomography; 1997-1999 Research Assistant at Institute of Biomedical Engineering, Technische, Universität Dresden, Topic: Medical Imaging; 1999-2000 Research Assistant at Institute of Safety Research, Forschungszentrum Dresden-Rossendorf, Topic: Gamma Ray Computed Tomography of Two-phase Flow; 2000-2002 DFG Habilitation stipend, Technische Universität Dresden, Topic: Quantitative Near-Infrared Tissue Spectrocopy; 2002-2006 Group Leader Multiphase Measurement Techniques at Institute of Safety Research, Forschungszentrum Dresden-Rossendorf; Since 2006 Division Head Experimental Thermal Fluid Dynamics at Institute of Safety Research, Forschungszentrum Dresden-Rossendorf, now Helmholtz-Zentrum Dresden-Rossendorf; Since 2012 AREVA Endowed Chair of Imaging Techniques in Energy and Process Engineering, Technische Universität Dresden.
Vice President International Society for Industrial Process Tomography (ISIPT); Member ArbeitskreisHochschullehrerfürMesstechnik AHMT; Guest Editor International Journal of Signal and Imaging Systems Engineering and Flow Measurement and Instrumentation; Referee for Deutsche Forschungsgemeinschaft, Czech Grant Agency GARC, BMBF, BMWi, DAAD; Co-Chair 7th World Congress on Industrial Process Tomography, Krakow, Poland, September 2013; Chair 7th International Symposium on Process Tomography, Dresden September 2015; Member of the Scientific Committee of different conferences, symposia and workshops.