Download Drying of Porous Materials by Stefan Jan Kowalski PDF

By Stefan Jan Kowalski

This publication offers fresh advances in learn on drying of particulate and porous fabrics. it truly is in line with a variety of papers provided on the XI Polish Drying Symposium 2005. The contributions hide theoretical, in addition to experimental and modeling learn on warmth and mass move procedures in the course of drying of porous fabric and fluidized beds. The publication is a pioneering contribution to the technological know-how and know-how of drying of particulate solids.

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During this period, termed the falling rate or the second period (II) of drying, the vapour–liquid interface recedes towards the body interior, in particular when the body is non-hygroscopic. g. g. Luikov 1975). One can find a number of papers concerning moving boundary problems as they occur due to melting, solidification or freezing of matter, but not caused by drying. This paper is a contribution to this problem in the drying area. Separate modelling of the individual drying periods is much easier than modelling the drying process as a whole.

Figures 2a, b present the graphical performance of functions (28) and (29). 15 and starts to increase in the second stage of drying up to some maximum value. Below XA the 52 Transp Porous Med (2007) 66:43–58 Fig. 2 Graphical performance of the distributive functions: (a) phase transition coefficient ω(T, X l ), (b) structural moisture transport coefficient f (X l ) function tends to zero again. The behaviour expresses the fact that the phase transitions of liquid into vapour inside the body are neglected in the constant (I) drying rate period and are maxim during the falling (II) drying rate period when X l = XA .

4 for a cylindrically shaped sample dried convectively (see Fig. 1). 3 Stresses induced by convective drying The equations of a mechanistic model of drying presented in Kowalski (2003) have been used to determine the drying induced stresses. The dried material is assumed here to behave as elastic or viscoelastic (obeying the Maxwell model). The governing equations consist of the equation of equilibrium of internal forces, the physical relations and the equations describing the moisture evolution during drying.

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