Determination of the inlet temperature profile of an extrusion die in unsteady flow

The aim of this study is to determine the temperature profile at the inlet of an extrusion die by measurements in unsteady flow. Temperature measurements are collected by thermocouples installed along the die, in walls, at the borders of the extrusion channel. Measured temperatures are function of t...

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Bibliographic Details
Published in:Chemical engineering and processing 2008-03, Vol.47 (3), p.456-462
Main Authors: Pujos, Cyril, Régnier, Nicolas, Defaye, Guy
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Extrusion die
Inlet temperature profile
Inverse method
Unsteady flow
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Summary:The aim of this study is to determine the temperature profile at the inlet of an extrusion die by measurements in unsteady flow. Temperature measurements are collected by thermocouples installed along the die, in walls, at the borders of the extrusion channel. Measured temperatures are function of the inlet temperature profile, which we are looking for, of the heat generated by the viscous dissipation and of thermal transfers inside the walls and inside the extrudated polymer. Sensitivity to all those phenomena is thus a crucial problem. Our model describes flow, heat generation, thermal exchanges, and their coupling by thermal rheological laws. Experimental validation of numerical results is provided thanks to real measurements from an instrumented die. The adjoint method is used to solve the inverse problem. First results are shown and analyzed.
ISSN:0255-2701
1873-3204
DOI:10.1016/j.cep.2007.01.008