Mass transfer from a rotating cylinder with and without crossflow

Hydrodynamic, mass transfer, and dissolution effects induced by tablet location during dissolution testing

“…The mass transfer coefficients for the top and side surfaces of the off-center tablets were estimated using the mass transfer models for a flow parallel a flat plate (top surface) and past a single cylinder (side surface). The solid-liquid mass transfer coefficient for a liquid moving parallel to flat plate was calculated from: 30,32 k top ¼ 0:99uðReÞ À0:5 ðScÞ À2=3 (16) where u is the approaching velocity of the liquid to the flat plate, Sc is the Schmidt number, and Re is the Reynolds number, defined as: 30,32 Re ¼…”

“…(16). The solid-liquid mass transfer coefficient on the cylindrical side of the tablet was obtained from the equation describing the mass transfer around cylinders: 30,32 k side ¼ 0:6uðReÞ À0:487 ðScÞ À2=3 (18) where Re was calculated as before, and the approaching velocity u was predicted as just described above.…”

Convective mass transfer from a horizontal rotating cylinder in a slot air jet flow

“…In order to compare the mass-transfer behavior with that of heat transfer, the processing method of experimental data can be referred to in Ref. [10]. The mean error between the experimental data and the curves shown in Fig.…”

“…However, the second critical point was not reached due to low rotational speed. Labraga and Berkah [10] measured the local mass transfer from a rotating cylinder in crossflow by using the electrochemical method. Based on the experimental data, an equation correlating the mean Sherwood number Sh with the rotating Reynolds number Re Ω and free stream Reynolds number Re 1 was obtained.…”

Convective heat transfer analysis in aggregates rotary drum reactor

“…The external transfer coefficient exerted upon the circumferential length of the drum, L c , is calculated by a correlation of Kays cited by Labraga and Berkah [18] and given by:…”