A mechanical model for felt in impulse drying: A cellular materials approach. I. Model development and simulation |
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Authors: | H Aguilar Ribeiro C A V Costa |
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Institution: | (1) Department of Chemical Engineering, LEPAE — Laboratory of Process, Environment and Energy Engineering, University of Porto, 4200-465 Porto, Portugal |
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Abstract: | This paper presents a physically based model of the densification of a felt in the press nip of a paper machine, running at
operating conditions similar to those used in impulse drying. The model incorporates the observed features of wet felts compression
such as non-linear elasticity and non-recoverable strains that are rate-dependent. A viscoelastoplastic model, based on the
cellular solids theory, was developed to describe this behavior. The governing differential equations of the model were established
bearing in mind an assembly of modified Maxwell elements combined in series and then arranged in parallel. This approach resulted
in a three-dimensional unsteady-state problem, solved by means of an integrator based in the Gear method. The model was used
to predict the evolution of thickness, elastic and viscous moduli and apparent density of the material. |
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Keywords: | Modeling Unsteady-state Viscoelastoplastic mechanical behavior Cellular solids theory Fibrous material (felt) |
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