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Development and industrial applications of explicity algebraic fluid models

Development of simplified fluid models based on a convected scalar state variable, software implementation and validation in industrial flow processes, aiming at improving the process and dye design for extrusion of rubber tyre profiles.

The development and/ or optimisation of dyes for rubber band extrusion is usually a challenge for the industrialist, as it is endowed with several difficulties. In this context, CAE tools could or should be of practical help. However, they currently offer capabilities, which are usually limited by the computer requirements, as well as by the knowledge of the rheology of the processes materials. Indeed, on the one hand, traditional tensor-based viscoelastic models are computer-resource intensive so that they can rarely be used in 3D complex extrusion applications, even with a single relaxation time. On the other hand, traditional viscoelastic material parameters are difficult to identify from experiments usually available in industry. This latter difficulty is linked to the absence of separation (because of objectivity reasons) between the viscous and the elastic parts in the equations. These two difficulties make tensor-based viscoelastic models less popular than they could be in industrial applications where the effects of viscoelasticity nevertheless remain essential, such as plastic or rubber transformation. An expected output of the project is a significant reduction in the required computational resources, especially for 3D extrusion flow simulations. It is indeed estimated that the reduction in calculation time can reach a factor of 50 to 150 (for a 3D multimode viscoelastic flow simulation), while the reduction in memory requirement can be of the order of 15 to 30. In view of its objectives, the present project is more a basic industrial research project than a technological development project. Indeed, it involves the development of new constitutive models; this will be mainly performed at the UINIVERSITY DE LILLE and is based on early theoretical developments by MOMPEAN and co-workers. An implementation of the suggested models will be done in the software by POLYFLOW S.A., while industrial validations on rubber tyre extrusion processes will be carried out by MICHELIN. The ambition of these objectives is reasonable. In particular, theoretical developments will not be started from scratch and the time frame is realistic for such work to be carried out. Also, having three partners with very distinct activities will make it easier to reach an agreement on the industrial exploitation of results. Theoretical developments performed at the UNIVERSITE DE LILLE are expected to be published;, software implementation and marketing is the business of POLYFLOW S.A. and the FLUENT GROUP, while the industrial applications in rubber extrusion and rubber tyre manufacturing remain the business of MICHELIN. Keywords: viscoelastic models, numerical simulation, rubber extrusion.
Acronym: 
SCAFTEN
Project ID: 
2 799
Start date: 
01-07-2002
Project Duration: 
36months
Project costs: 
560 000.00€
Technological Area: 
Simulation
Market Area: 

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.