OXYGEN DIFFUSION THROUGH SANDS IN RELATION TO CAPILLARY HYSTERESIS

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Abstract
Air was permitted to diffuse through packs of stainless steel tubes, adjusted to various porosities, into a chamber fitted with an oxygen cathode. After sufficient time had elapsed the cathode recorded linear changes in the O2 concentration with time and the slope of this line plotted against the porosity of the core was also linear. Extrapolation of the latter curve to a porosity of unity gave the diffusion coefficient of O2 into N as o.201/cm2per sec at 20[degree]C. From standard tables a calculated value of 0.205/cm2 per sec at 20[degree]C was obtained. The same results were obtained with membranes of 0.0005 in., 0.0015 in. and 0.003 in. polyethylene covering the cathode. The cathode system therefore proved satisfactory for measurement of O concentrations when the concentration was steady or was varying lineally with time. However under transient conditions it was not possible to obtain reproducible or predictable behavior of the 02 cathode.

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