Mass transfer to newtonian and non-newtonian fluids from rotating cylinders

Abstract

Mass transfer from rotating cylinders to Newtonian and non-Newtonian fluids is investigated. Present and previous data are analysed and correlations are presented. Free convection mass transfer correlations for vertical cylinders are found to differ from those for horizontal cylinders available in previous literature. Modified Prandtl analogy is applied, by considering the eddy penetration of the diffusion sublayer, to obtain the following expression for forced convection mass transfer. Sh Sc- 1 3 = 0.62fRe which is found to correlate the present and previous data in the range of Sc, 2.6-32000, Pr, 0.72-676 and Re, 102-105 with a standard deviation of 14.6%. Differential viscosity is used to correlate mass transfer data to non-Newtonian fluids. Experimental results are seen to be lower than those predicted by the Newtonian correlation. © 1980.