title: Mathematical description of solute velocities during dissolution from a horizontal surface.
abstract: A mathematical analysis of solute flow in a descending column following dissolution is presented. The acceleration of a solute particle from zero velocity, when it is in the solid phase, to its final equilibrium descending velocity was analyzed. The maximum velocity for N-(3-methylphenyl) acetamide developed essentially at the solid-liquid interface, contradicting the postulate of a microsize diffusional layer. The possibility of a diffusional layer existing for solids of lower solubility than N-(3-methylphenyl)acetamide is discussed.
mesh_terms: D000081:Acetamides; D001549:Benzamides; D004058:Diffusion; D007700:Kinetics; D008956:Models, Chemical; D010615:Phenacetin; D012457:Salicylamides; D012995:Solubility; D013499:Surface Properties; D014783:Viscosity
chemical_list: D000081:Acetamides; D001549:Benzamides; D012457:Salicylamides; D010615:Phenacetin