Mass transfer from a solid sphere to water in highly turbulent flow

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Abstract
Mass transfer coefficients from 1/2‐in. spheres of benzoic and cinnamic acids and 2‐napthol to water were measured in the high Reynolds number region of 600 to 140,000. Previous data for liquids extended only to a Reynolds number of 11,000. Three separate and approximately parallel lines of JD vs. Reynolds number were found for the different solutes, and the shape of the curves was found to be similar to the total‐drag‐coefficient correlation for spheres.Experiments with benzoic acid and 2‐napthol showed an effect of driving force and hence flux on the JD values. Mass transfer did occur in saturated solutions having zero driving force. When one subtracted the amount of mass transfer at zero driving force from the values at other driving forces, the corrected JD values at different driving forces were the same for a given solute. Possible explanations may be the effect of extreme turbulence on crystallization or physical attrition.

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