Abstract
Analytical methods for dehydration of filter cakes and semi-solids materials by constant pressure expression are presented under the existence of medium resistance and creep effects. The equations are solved for various ratios of (Rc/Rm), and the calculated results show good agreements with experiments.
In view of the existence of medium resistance, basic consolidation equations based upon Terzaghi-Voigt model are solved in terms of the ratio of cake-medium resistance (Rc/Rm) and the creep constants B and η. In order to determine the experimental values of the consolidation coefficient Ce for constant pressure expression with appreciable medium resistance, graphical fitting methods which are the modifications of the methods formerly reported, together with the values of the parameters of ζ, ξ, ζ'' and ξ'', all of which depend upon (Rc/Rm) is employed. It is shown that the decrease in dehydration rate due to the existence of medium resistance is great when Rm≥Rc/10. Satisfactory agreement between theory and experiments are assured for both filter cakes and saturated semisolid materials.
