Objectivs:

• Development of imaging techniques with high spatial and temporal resolution to determine phase distributions, temperatures and species concentrations in multiphase flows
  Focus: electron beam X-ray CT, radioactive tracer techniques, wire-mesh sensor technique, electrical and optical spectroscopy
   
• Methods for image data analysis and data fusion for process and multiphase imaging; utilization of high performance computing
   
• Close interlink to flow and process modelling by generating validation data in generic experiments
   

Topics:

Development of multiphase flow measurement techniques

• Ultrafast X-ray tomography system (ROFEX)
• Ultrafast limited angle X-ray computed tomography
• Fast 3D X-ray computed tomography
• Gamma-ray computed tomography
• Measurements with wire-mesh sensors
• Autonomous sensor particle for parameter tracking in large vessels
• Industrial measurement techniques in multiphase flows

Generic experiments on fundamental phenomena in two-phase flows

• Investigation of stationary and transient two-phase flows in vertical pipes (TOPFLOW) using wire mesh sensors and ultrafast X-ray computed tomography
• Experimental investigations of stratified two-phase flows using optical computed tomography
• X-ray tomography of Taylor bubbles in capillary two-phase flow

Chemical multi-phase processes and reactors

• Energy efficiency of chemical multi-phase processes
• Development of alternative reactor concepts
• Investigation on hydrodynamics in multi-phase processes(bubble columns, fixed-bed reactors, flotation equipment, fluidized beds)
• Validation of multiscale processes with CFD models

Thermohydraulics und measurement equipment for nuclear reactors

• Thermohydraulics of the Pressurized Thermal Shock(PTS)
• Heat transfer in passively operated emergency condensers
• Boiling processe in rod bundles
• Bubble entrainment on valves and centrifugal pumps
• Insulation material and corrosion
• Transport, deposition and resuspension behaviour of carbonaceous dust
• Monte Carlo simulations of the gamma ray distribution outside the reactor pressure vessel in case of nuclear accidents