Graduate Thesis Or Dissertation
 

Determination of concentration gradients in a diffusing binary gas system by optical interferometry

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qj72pb409

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  • An experimental technique employing a moveable Mach-Zender interferometer for measuring composition profiles in the gas phase of an Arnold diffusion cell has been developed. The experimental apparatus included a specially built cell having a pair of glass sides to allow continuous detection of the refractive index. With the integrated apparatus, the composition profiles of several diffusing binary gas systems were accurately measured. From these composition profiles and measurements of the accompanying mass flux, the terms in Fick's law of diffusion were calculated. This allowed a direct determination of diffusivity at various system compositions. The variations of binary molecular diffusivity with composition for benzene-nitrogen and chloroform-nitrogen were calculated and compared to previous work. Higher than expected mass fluxes were observed leading to speculation that a perturbed diffusion process was being observed. Nevertheless, it was concluded that this use of an optical interferometer to experimentally measure gas phase concentration profiles is practical and accurate.
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