Abstract
A common path-shearing interferometer was adapted, using a Wollaston prism, to measure the diffusion coefficient for mass transfer of transparent, miscible liquids. The mathematics was developed for the time-dependent, one-dimensional diffusion process in a test cell when the diffusivity is a function of the local concentration of the fluids, and a procedure was devised to determine the diffusivity from the measured concentration gradient profiles. The results show that for diffusion in a water/glycerine system, the diffusivity depends on the concentration in an almost linear fashion. In the case of the silicone oils, the diffusivity was found to be nearly independent of the local concentration.
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