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Hydrodynamicst axial mixing and mass transfer in rotating disk contactors
Author(s) -
Zhang S. H.,
Ni X. D.,
Su Y. F.
Publication year - 1981
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450590503
Subject(s) - péclet number , critical ionization velocity , mechanics , turbulence , mixing (physics) , drop (telecommunication) , physics , mass transfer , critical speed , rotor (electric) , contactor , thermodynamics , limiting , mechanical engineering , telecommunications , power (physics) , quantum mechanics , computer science , engineering
Correlations for predicting characteristic velocity both above and below the critical rotor speed have been obtained under conditions with and without solute transfer. It has been found that (1) above the critical rotor speed, the characteristic velocity U 0 is proportional to g/D r N 2 , whereas below this value a transition region exists where U o is proportional to (g/D r N 2 ) 0.26 ; (2) multiple regression analysis of the experimental data of continuous phase axial mixing shows that the axial dispersion coefficient varies not only with the rotor speed and modified velocity of continuous phase but also with the velocity of dispersed phase. With varying RDC operations, the true value of K od corrected for axial mixing changes continually between the limiting values predicted from stagnant and fully turbulent drop models. However, the highest experimental values were only 30 to 40% of those predicted by the Handlos‐Baron model at the same drop Peclet number.