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Download PDF by M. El-Amin : Advanced Topics in Mass Transfer

By M. El-Amin

ISBN-10: 9533073330

ISBN-13: 9789533073330

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Hydrogen Energy 34: 1620–1626. El-Amin, M. F. & Kanayama, H. (2009b). Integral solutions for selected turbulent quantities of small-scale hydrogen leakage: a non-buoyant jet or momentum-dominated buoyant jet regime, Int. J. Hydrogen Energy 34: 1607–1612. El-Amin, M. F. & Kanayama, H. (2009c). Similarity consideration of the buoyant jet resulting from hydrogen leakage, Int. J. Hydrogen Energy 34: 5803–5809. El-Amin, M. , Heidemann, W. & Mller-Steinhagen, H. (2010). Analysis of a turbulent buoyant confined jet using realizable k-¡ep¿ model, Heat and Mass Transfer To appear: 1–20.

75 2 Ș Fig. 5. Dominant kinetic energy production term profile for the momentum-dominated jet. , see Wygnanski). Fig. , 2008b). The following definitions for the turbulent eddy viscosity νt and turbulent eddy diffusivity Dt may also be used, uv = −νt ∂U ∂r (17) vc = − Dt ∂C ∂r (18) and to derive corresponding expressions as, cm νt = 2 1 − exp(−η 2 ) Ucl b 4η (19) cm Dt = 2 2 1 − exp(−η 2 ) Ucl b 4λ η (20) and respectively. Eqs. (19) and (20) indicate that the turbulent eddy viscosity and turbulent eddy diffusivity are not independent of η, as assumed in works such as (Tennekes & Lumley, 1972), but are variable as a function of η, as suggested by others (Lessen, 1978).

Shabbir, A. & Georg, W. K. (1994). Experiment on a round turbulent plume, J. Fluid Mechanics 275: 1–32. Spiegel, E. A. & Veronis, G. (1960). On the boussinesq approximation for a compressible fluid, Astrophys. J. 131: 442–447. Steward, F. R. (1970). Prediction of the height of turbulent diffusion buoyant flames, Combust. Sci. Technol. 2: 203–212. Swain, M. , Filoso, P. A. & Swain, M. N. (2007). An experimental investigation into the ignition of leaking hydrogen, Int. J. Hydrogen Energy 32: 287–295.

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