Abstract
Rates of mass transfer were measured at a vibrating rough (V threaded) vertical cylinder by the electrochemical technique. Variables studied were frequency and amplitude of oscillation, and degree of surface roughness. The rate of mass transfer at the rough vibrating cylinder was found to increase by a factor ranging from 2.75 to 6.1 compared to the smooth vibrating cylinder depending on the operating conditions. In general the enhancement ratio increases with increasing Rev especially at high amplitudes; for low amplitudes it passes through a maximum and then decreases with further increase in Rev. The data for oscillating rough cylinder were correlated by the equation:
Sh(L) = 0.535 Sc(0.33)Rev(V,L)(0.5)(e/P) (0 67)
A mathematical model based on the surface re newal theory was found to correlate the present data with a standard deviation of 7.29%. Implications of the present study for the design and operation of high space time yield annular catalytic and electrochemical reactors used to conduct diffusion controlled reactions was noted. Also the importance of the present results to the design and operation of annular dialyzers using corrugated vibrating cylindrical membrane was highlighted. (C) 2014 Elsevier Ltd. All rights reserved.