Mixing of granular systems Team: SPACEBALLS Francesco Ceriani Camilla Corradi Alessandro Fiorucci Alessandro Marchiori Antonio Pelucchi Laura Zamolo Noordwijk.

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Presentation transcript:

Mixing of granular systems Team: SPACEBALLS Francesco Ceriani Camilla Corradi Alessandro Fiorucci Alessandro Marchiori Antonio Pelucchi Laura Zamolo Noordwijk th March 2005 Dipartimento Chimica, Materiali ed Ingegneria Chimica Giulio Natta Milano

What is a granular system? Granular systems are conglomerates of discrete and macroscopic particles behave differently from any other aggregation state have only superficial movement cannot be described by fluid dynamical laws

Great industrial interest Mixing of granular materials is a key process in several industrial sectors (building industry, pharmaceutical products, human and animal feeding, detergents, chemical products, plastics) Processing of granular materials is considered responsible of 10% of global energy consumption

Experimental method Mixing phenomena were analized with two approaches: Computational Experimental

The experiment Small scale screw mixer Rotation provided by an electrical engine Alumina pallets of two different colours Simple and safe for the parabolic flight

Computational Model Modelling of the experiment through a computational code integration of Newton’s equations with D.E.M. Tuning of friction and damping constants by comparison with experimental data Software: PFC 3D D.E.M. : Distinct Element Method, useful for the study of the discontinuous nature of granular systems

Why in microgravity? Further validation of the model Deeper knowledge of mixing phenomena and effects of the force of gravity Alternative methods (mixing in liquids) change the physical parameters of the system Industrial application: product quality improvement and energy saving

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