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Rates of mass transfer at the inner rough surface of an annulus were determined under swirl flow by an electrochemical
technique which involves measuring the limiting current of the cathodic reduction of K3Fe(CN)6. Roughness was made by
cutting longitudinal grooves in the inner cylinder transverse to swirl flow. The variables studied were solution velocity, peak to
valley height of the roughness element, physical properties of the electrolyte, active length of the inner cylinder and the effect
of drag reducing polymers. The rate of mass transfer was found to increase with increasing swirl flow velocity and the degree
of surface roughness. Mass transfer data at smooth and rough surfaces were correlated by dimensionless correlations. Drug
reducing polymers were found to decrease the rate of mass transfer by an amount ranging from 5 to 23%. Implication of the
present results for the design and operation of high space-time yield annular and catalytic reactors used to conduct diffusion
controlled reactions such as electro organic synthesis; electrochemical waste water treatment; photo catalytic reactions and
immobilized enzyme catalyzed biochemical reactions etc., were highlighted. The importance of the present results in designing
more efficient annular membrane equipment's with inner corrugated membrane to conduct processes such as reverse osmosis,
dialysis and ultra-filtration under swirl flow was pointed out. By virtue of the analogy between heat and mass transfer the
importance of the present results in designing more efficient heat exchanger was noted.
Dina Ahmed El-Gayar has completed her PhD from Alexandria University Faculty of Engineering and finished MSc Chemical Engineering from the same university in 2009. She is Lecturer at Chemical Engineering Department, Alexandria University. She is Instructor for Process control and Renewable Energy Resources. She is member in the executive office of Quality Assurance Unit in faculty of Engineering. She works in Alex Uni. Team in a Trinex project funded by Tempus as one of the partners of the project. She has published 2 papers in international journals and 2 papers are in progress.