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Applied Fluid Mechanics and Mixing Group

Our research activity is mainly concerned with the investigation of the behaviour of equipment typically employed in the chemical, biochemical and process industries, characterized by a complex fluid dynamic behaviour.

Special focus has been given to fluid mixing problems in stirred tanks, bioreactors and static mixers. Over the past few years attention has also been extended to fluidised beds, membrane modules for gas mixture separations, filter-press and inertial separators for oil and gas applications.

Research efforts have been equally devoted to the development of experimental and computational techniques for the characterization and the prediction of single and multiphase flows in different process equipment. The studies in these areas are based on state-of-art experimental techniques and Computational Fluid Dynamics, on the development of mathematical and/or phenomenological models and on the application of these modelling techniques to the design, rating and optimisation of equipment.

The experimental laboratory of the research group is fully equipped for the fluid dynamic characterization of the apparatuses through two complete Particle Image Velocimetry systems (2D- PIV and Stereo-PIV), that can be also adopted for mixing time measurements (PLIF technique). One of the two PIV systems has been implemented for simultaneous two-phase flow measurements and the other for bubble/droplets size distribution determination through digital image analysis.

Recently, the investigation of dense multiphase systems based on Electrical Resistance Tomography (ERT) has been started. Particle size distribution of dense multiphase mixtures is also determined by means of a Spraytec by Malvern Instruments.

For the computational activity, general purpose commercial CFD codes are usually adopted (Fluent, CFX), implemented with in-house developed user functions for the introduction of specific models.

Our research is founded by the Italian Ministry of Scientific Research, the Italian Ministry of Agriculture and Forestry, the Region of Emilia Romagna, the European Union and private industries.

Members: Franco Magelli, Giuseppina Montante, Antonio Busciglio, Alessandro Paglianti

Contact: Prof. Giuseppina Montante – giuseppina.montante @ unibo.it


Multiphase Systems and Reactors Group

Our research activity focuses on the investigation of mixing in multiphase turbulent reacting systems. We have gained significant experience in the optimization and scale-up of different types of chemical reactors and process engineering equipment: gas-liquid stirred tanks, bubble columns, crystallization and precipitation reactors, fluidized beds and single- and multi-phase combustors.

The investigation is carried out by using both theoretical and modeling tools, as well as experimental techniques.

The modeling tools are in general based on computational fluid dynamics. We are working with both opensource (e.g. openFOAM) and commercial (e.g. ANSYS/Fluent, TransAT) codes. Numerous models to simulate and deal with fast chemical reactions and polydispersity (e.g. population balances) have been developed and implemented in these codes.

The experimental techniques are mainly related to the investigation of mixing issues in crystallization and precipitation reactors. Our laboratories are equipped with instruments to characterize solid amorphous particles and crystals in terms of their size distribution (i.e. static light-scattering, dynamic light-scattering), morphology (i.e. scanning electron microscopy) and internal structure (i.e. X-ray diffractometry).

Our research activity is funded by the Italian Ministry of Scientific Research, the Region of Piedmont, the European Union and private industries.

More information can be found here: http://www.disat.polito.it/research/research_groups/musychen/multiscale_modelling_for_materials_science_and_process_engineering

Contact: Prof. Daniele Marchisio - daniele.marchisio @ polito.it