Abstract
An experimental examination was made of the assumption for diaphragm diffusion cells that the resistance to mass transfer in the fluid regions adjacent to either side of the disk is negligible. The free- and forced-convection mass transfer characteristics of the vertical diaphragm cell were investigated and the results correlated in terms of stirrer speed and fluid properties. Data obtained indicated that cell constants obtained from calibration with dilute KCl or HCl at stirring speeds in the neighborhood of the critical speed will remain constant for most other solute-solvent systems of interest. However, if highly porous diaphragms or fluid systems of high viscosity and low diffusivity are employed, then the external mass transfer resistance may be an appreciable fraction of the resistance of the glass disc. (M.C.G.)
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