Abstract
Rates of solid–liquid mass transfer were measured at the inner surface of an annular duct by the electrochemical technique under developing flow conditions. Variables studied were physical properties of the solution, velocity, length of the annulus, inlet port diameter and surface roughness. Inlet port diameter was found to have no effect on the rate of mass transfer. For smooth annuli the laminar flow data fit the equation:
Sh = 1.029Sc0.33Re0.55(L/d)-0.472
The turbulent flow data fit the equation:
Sh = 0.095Sc0.33Re0.85(L/d)-0.472
Surface roughness in the form of V-threads normal to the flow was found to have a negligible effect on the rate of mass transfer in the laminar flow region while in the turbulent region the data fit the equation:
Sh = 0.167Sc0.33Re(L/d)-0.472(e/d)0.33
Under the present conditions, where the dimensionless roughness height e+ lies between 0.5 and 22, the rate of mass transfer was found to increase by an amount ranging from 10% to 200% depending on e+.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C. S. Lin, E. B. Denton, H. S. Gaskill and G. L. Putnam, Ind. & Eng. Chem. 43 (1951) 2136.
T. K. Ross and A. A. Wragg, Electrochim. Acta 10 (1965) 1093.
J. Legrand and S. A. Martemyanov, J. Appl. Electrochem. 24 (1994) 737.
G. H. Sedahmed and L. W. Shemilt, Int. Commun. Heat Mass Transf. 3 (1976) 499.
J. Postlethwaite and U. Lotz, Can. J. Chem. Eng. 66 (1988) 75.
D. A. Dawson and O. Trass, Int. J. Heat Mass Transf. 15 (1972) 1317.
M. Grimanis and B. Abedian, Physicochem. Hydrodyn. 6 (1985) 775.
G. H. Sedahmed, M. N. Soliman and N. S. El-Kholy, Can. J. Chem. Eng. 59 (1981) 693.
S. K. Singh, S. N. Upadhyay and G. Tripathi, Indian Chem. Eng. 13 (1971) 161.
B. N. Rai, A. K. Sinha, U. K. Ghosh, S. N. Gupta and S. N. Updhyay, Chem. Eng. Comm. 68 (1988) 15.
R. F. Farman and R. B. Beckmann, Chem. Eng. Progress. Symp. Series no. 79, 63 (1967) p. 57.
A. I. Vogel, `A Textbook of Quantitative Inorganic Analysis', Longmans, 3rd edn, London (1961).
J. R. Selman and C. W. Tobias, Adv. Chem. Eng. 10 (1978) 211.
I. R. Bourne, P. Dell Ava, O. Dossenbach and T. Post, J. Chem. Eng. Data 30 (1985) 160.
F. P. Berger and K. F. F. L. Hau, Int. J. Heat Mass Transfer 20 (1977) 1185.
E. M. Sparrow and M. Molki, ibid. 27 (1984) 669.
N. Ibl, `Comprehensive Treatise of Electrochemistry' vol. 6 (1983) p. 133.
M. Ould Rouis, A. Salem, J. Legrand and C. Nouar, Int. J. Heat Mass Transfer 38 (1995) 953.
J. Qi and R. F. Savinell, J. Appl. Electrochem. 20 (1990) 885.
F. Walsh, `A First Course in Electrochemical Engineering', The Electrochemical Consultancy, Romsey, UK (1993).
J. K. Knudsen and D. L. Katz, `Fluid Dynamics and Heat Transfer', McGraw-Hill, New York (1958).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
MOBARAK , A.A., FARAG , H.A. & H.SEDAHMED , G. Mass transfer in smooth and rough annular ducts under developing flow conditions. Journal of Applied Electrochemistry 27, 201–207 (1997). https://doi.org/10.1023/A:1018408125105
Published:
Issue Date:
DOI: https://doi.org/10.1023/A:1018408125105