Mass transfer from fluid and solid spheres at low Reynolds numbers: Part II

摘要: Rates of mass transfer from water drops into cyclohexanol and cyclohexanol, isobutanol, o-toluidine were measured. These experimental data augmented by published results, to cover, at drop Reynolds numbers less than 10, a Peelet number range 0.01 5,000,000 for non-circulating spheres 700 24,000,000 circulating spheres. Transfer rates, expressed as Sherwood numbers, in substantial agreement with those predicted theoretical model. The contribution natural convection, inherent the measurements, but omitted model, was approximately accounted for. Data verified hypothesis that internal motion affects external rate. This effect depends on ratio continuous disperse phase viscosity system; four six-fold enhancement due circulation found falling cyclohexanol. Les auteurs ont mesure les taux de transfert masse partir gouttes d'eau dans le et d'isobutanol l'eau. On ajoute aux resultats experimentaux en puisant meme des publies pour balayer, nombres Reynold inferieurs 10 gouttes, un champ correspondant nombre Peclet allant ne comportant pas circulation, avec circulation. Les transfert, exprimes sous forme Sherwood, s'accordent assez bien ceux que l'on predits d'un modele theorique. tenu compte, facon approximative, l'effet convection naturelle methodes mais omis modele. une interne verifient l'hypothese cette affecte l'exterieur. L'effet note depend du rapport la viscosite continue celle dispersee; trouve accroissement, par facteur 4 6, attribuable tombant cyclohexanol.