By M. El-Amin
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Extra info for Advanced Topics in Mass Transfer
1). , 2007) show that geometrical parameters of the paddle, size and aspect ratio of the cell and paddle shape have a strong inﬂuence on mass-transfer phenomena within the electrochemical cell. In literature a relationship has been proposed between the diffusion layer thickness and paddle geometrical parameters. The Sherwood number, which can be deﬁned as the ratio of the advection lengthscale and the diffusion lengthscale, was shown to be equal to: Sh = Advection lengthscale g+h = = αRem Sc1/3 Diffusion lengthscale δ (1) where m and α are coefﬁcients that depend on the geometry of the system, Re = V · (h + g)/ν, Sh = ( h + g)/δ, Sc = ν/D.
93. The entrainment coefﬁcient α is considered as a variable given by Eq. (41). 7 and compared with the theoretical asymptotic limits for momentum-dominated jets (1/Ccl ∝ z) and the buoyancy-dominated plume limit (1/Ccl ∝ z5/3 ). 001 1 10 z/d 100 1000 Fig. 7. Comparison of the current model and jet theory of the centerline mass fraction (log-log plot) for H2 − Air jet, with different values of Froude number. Fig. 8. Contours of the mean mole fraction for H2 − Air jet with different values of Froude number, with different values of Froude number.
K. & Faeth, G. M. (1995). Velocity statistics of round, fully developed, buoyant turbulent plumes, Trans. ASME, J. Heat Transfer 117: 138–145. El-Amin, M. F. (2009). Non-boussinesq turbulent buoyant jet resulting from hydrogen leakage in air, Int. J. Hydrogen Energy 34: 7873–7882. El-Amin, M. , Inoue, M. , K. (2008). Boundary layer theory approach to the concentration layer adjacent to a ceiling wall of a hydrogen leakage: far region, Int. J. Hydrogen Energy 33: 7642–7647. El-Amin, M. F. & Kanayama, H.
Advanced Topics in Mass Transfer by M. El-Amin