Measurement Of The Diffusion Coefficient Of Miscible Fluids Using Moir Deflectometry

Measurements of the diffusion coefficient of two miscible liquids are reported.rnThe liquids are various combinations of sodium chloride (NaCl) and pure water.rnThe liquids were placed in a diffusion cell such that the interface is initiallyrnhorizontal. As the fluids diffuse, the profile of the index of refraction near therninterface is time dependent and is related to the local concentration of therndiffusing fluids. The concentration gradient profile was measured, thernexperimental details and theoretical analysis for obtaining the magnitude ofrndiffusion coefficient using the Moiré fringe patterns are described.rnIn this report the Moiré defelectometery method is applied for measuring therndiffusion coefficient of NaCl in pure water at room temperature. The averagerndiffusion coefficient was obtained by analysis of the measured concentrationrngradient profile, assuming that the diffusion process is one-dimensional and isrncharacterized by a constant value of the diffusion coefficient (D). The value ofrnsrnD mrn2rn9 1.58( 0.05) 10    is obtained for diffusion of NaCl molecules in purernwater and it is in good agreement with the reported value in literatures

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