Mass transfer from a flat surface to an impinging turbulent jet

Mass transfer between an impinging turbulent jet of water and a flat surface has been studied. The surface was coated with trans-cinnamic acid, and thickness decrease profiles were measured. Local Sherwood numbers in the wall-jet region were found to be independent of the nozzle to plate distance, and were correlated by for nozzle Reynolds numbers of 25,000 to 125,000. Agreement with published heat transfer data was reasonable. Average Sherwood numbers in the impingement region were found to decrease rapidly beyond a transition zone of 6 1/2 diameters from the nozzle. Le transfert de masse obtenu entre une surface plane, recouverte d'acide cinnamique (trans) et un jet d'eau turbulent, est etudie en mesurant la formation des profils de L'epaisseur de L'acide. On a determine que le nombre de Sherwood local dans la region pres de la plaque est independant de la distance de L'ajutage a la plaque et peut ětre exprime par la relation pour des Re de 25,000 a 125,000. Ces donnees sont raisonnnablement en accord avec d'autres valeurs de transfert de chaleur. Le nombre de Sherwood moyen dans la region de collision diminue rapidement passe une zone de transition de 6 1/2 diametres de L'ajutage.