Abstract
It has been shown that the dissolution rate of gypsum in films of dilute sodium carboxymethylcellulose (SCMC) solutions is anomalously high compared with theoretical predictions. Two possible explanations of this phenomenon are discussed: either the coefficient of diffusivity in these solutions is much greater than it is in water, or the velocities close to the wall are increased due to a solvent layer formation. Preference is given to the second effect which explains the hydrodynamic behaviour of the solutions as well.
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