MEASUREMENT OF MOISTURE DIFFUSIVITY OF WET SWELLING SYSTEMS

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Abstract
A method for estimating the diffusivity function of a saturated swelling system is examined. The method is based on an equation linking the sorptivity, the diffusivity function, and the flux-concentration relation of Philip (1973) and uses appropriate values of the flux-concentration relation to set limits to the diffusivity function.For the material used in the experiments demonstrating the procedure, the calculation errors were no more than 7.5 percent. The method permits correction if this order of accuracy is insufficient.The results suggest that the conditions for which Smiles and Rosenthal (1968) solved their diffusion equation were not realized and their Dm and D results are therefore suspect. A method for estimating the diffusivity function of a saturated swelling system is examined. The method is based on an equation linking the sorptivity, the diffusivity function, and the flux-concentration relation of Philip (1973) and uses appropriate values of the flux-concentration relation to set limits to the diffusivity function. For the material used in the experiments demonstrating the procedure, the calculation errors were no more than 7.5 percent. The method permits correction if this order of accuracy is insufficient. The results suggest that the conditions for which Smiles and Rosenthal (1968) solved their diffusion equation were not realized and their Dm and D results are therefore suspect. © Williams & Wilkins 1973. All Rights Reserved.

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