The Laboratory of Chemical Engineering (LGC)works on the experimental study and the modeling of the mono and polyphase flows (implementation of rheologicaly complex fluids : for example, the mixed liquor in a process with activated sludge; implementation of polyphase systems: aeration tank, trickling filter, etc). A specific experimental methodology was developed to observe and model these complex flows. It is based on a fine metrology making possible to analyze the local structures of flow and their space and temporal distribution. The LGC has thus developed a complex experimental infrastructure (for example: techniques of visualization of the flows by X-ray tomography, electric tomography or by tracing technologies) likely to be applied to the study of the hydrodynamic of a large variety of unit operations met in chemistry, petrochemistry, agro-alimentary, pharmacology, …. The whole of these equipments can be installed on test benches reproducing the operating conditions met in the studied unit operations. Lastly, the laboratory also developed various numerical tools of simulation and modeling of the studied processes. These tools make it possible to identify the principal operational parameters at the time of the “scale-up” of the process.