Some Studies of the Transport Coefficients of Pulp and Paper

University dissertation from Lill Dahlström, Department of Chemical Engineering I, Lund University, Lund, Sweden

Author: Lars Nilsson; Lunds Universitet.; Lund University.; [1996]

Keywords: TEKNIKVETENSKAP; TECHNOLOGY; Permeability Pore nonuniformities Moisture gradients Magnetic resonance imaging Effective diffusivity Drying Cellulose fibres Computational fluid dynamics Wood pulp and paper technology Pappers- och massateknik;

Abstract: The drying of a porous material occurs in two different periods: the constant rate period and the falling rate period. During the constant rate period, the drying rate is determined by the external conditions regarding heat and mass transfer, and the drying rate is not influenced by the properties of the drying material. During the falling rate period, the material properties, such as the transport rates within the structure and the sorption isotherm, influence the drying rate. This thesis deals with the transport of mass and heat occurring within sheets of pulp and paper.

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