Mass Transfer Study of a Single Phase Flow Accelerated Corrosion (FAC) in 90° Copper Elbow
M. A. Fouad1, T. M. Zewail2, N. K. Amine3, Y.A. El-Taweel4
1M. A. Fouad, Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt.
2Dr. T. M. Zewail, Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt.
3Dr. N. K. Amine, Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt.
4Dr. Y.A. El-Tawail, Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt.
Manuscript received on July 17, 2013. | Revised Manuscript received on August 09, 2013. | Manuscript published on August 30, 2013. | PP: 36-41 | Volume-2, Issue-6, August 2013. | Retrieval Number: F1949082613/2013©BEIESP
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Abstract: Single phase FAC of 90° copper elbow in acidified dichromate has been investigated in relation to the following parameters: acid concentration, solution velocity, temperature and elbow radius to pipe diameter ratio. The rate of FAC was expressed in terms of mass transfer coefficient. The results showed that the mass transfer coefficient increases as solution velocity increases. Whereas the mass transfer coefficient decreases as the elbow radius to pipe diameter ratio increases. The effect of the acid concentration on the mass transfer coefficient varies according to the range of acid concentration considered. Activation energy calculation revealed partial controlled reaction kinetics at high acid concentration. The present mass transfer data for flow inside 90° copper elbows has been correlated by the equations: 2 0.44 0.33 1.2Re d r Sh Sc 678 < Sc < 767 2 0.44 0.33 5.2Re d r Sh Sc Sc= 845 The importance of these equations in the prediction of mass transfer coefficient in 900 copper elbows is highlighted.
Keywords: Erosion corrosion, Flow accelerated corrosion, Mass transfer coefficient, Stainless steel, 90° copper elbow.