(224e) Mass Transfer with Coaxially Placed Entry Region Coil - Disc Assembly as Turbulence Promoter in Vertical Tube Flow Reactor

Studies on mass transfer with coaxially placed entry region coil - disc assembly as turbulence promoter in vertical tube flow reactor have been studied in this paper. The electrolyte was equimolal Potassium ferricyanide, Potassium ferrocyanide and excess sodium hydroxide. The mass transfer correlation is based on law of the wall similarity. The variables covered in this study are the flow rate of the electrolyte, the geometric parameters of the promoter ? pitch of the coil, length of the coil, disc diameter, height of the disc and velocity of the fluid. Mass transfer coefficient is increasing with velocity and with disc diameter. Mass transfer coefficient is increases up to a maximum there after it shows a decrease with increase in height of the disc. Pitch of the coil increases to maximum and then showed a decreasing trend. Mass transfer coefficient increases with increase in length of the coil because of induced swirl motion of the fluid. The increase continued to a maximum value at coil length of 0.095 m, beyond which a marginal decrease was observed. Augmentations achieved are range from 1.5 to 8 fold as the velocity varies from 0.0591 m/s to 0.2751 m/s. A model was developed in terms of geometric parameters and presented.