In a previous paper, we studied the drying-rate equations based on the drying-shell models and the calculation methods of the rate parameters in the rate equations. In present paper, the rate parameters of the water-absorbing sponges which are considered as imagined fiber-foods, were determined for the sphere, the long-cylinder and the infinite-slab using a non-linear least square method. The imagined fiver-foods are simple samples which have no shrinkage of surface.
The calculated values using the rate parameters obtained independently from the integrated equations did not agree with the observed values. Simulate calculations of the rate parameters using a non-linear least square method were necessary.
The pore diameters of the sponges used in this study were not small and the water cores of the long-cylinder and the infinite-slab were transformed into ellipsoids and the disks. The calculated results for the long-cylinder and the infinite-slab did not agree with the observed values, but in the case of the sphere the results agreed. The rate parameters in this paper are merely experimental ones, but can be adopted satisfactorily for the design of various drying apparatuses.