Measurements of laminar dispersion in a capillary have been used to determine the molecular diffusivities of O2 and N2 dissolved in water. Measurements made on the CO2-H2O system at 25°C ., a system for which the diffusion coefficient was well known, indicated good agreement with the values reported by other investigators. No solubility data were required to determine the diffusion coefficient in this work and, in this aspect, the experimental method used offered a significant advantage over other techniques. Several correlations of diffusivity with temperature were tested and a new correlation is proposed.
x2 z = length of bubble interface from x = 0 = direction perpendicular to bubble surface measured from bubble surface Creek Letters (Y, / 3 = constants 6 = water film thickness p u = kinematic viscosity ( p / p ) p = fluid density u Subscript av = average = coefficient of shear viscosity = coefficient of interfacial tension LITERATURE C I T E D
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