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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/13593

Title: The buoyancy effects on the boundary layers induced by continuous surfaces stretched with rapidly decreasing velocities
Authors: Ali, ME
Issue Date: 2004
Citation: HEAT AND MASS TRANSFER, ISI JournalVL 40, IS 3-4, BP 285, EP 291, PY 2004, TC 15
Abstract: Heat and mass transfer characteristics of the self-similar boundary layer flows induced by continuous surfaces stretched with rapidly decreasing power law velocities Uw proportional to xm, m<-1 are considered for mixed convection flow. The effect of various governing parameters, such as Prandtl number Pr, temperature exponent n, dimensionless injection/suction velocity f(w), and the mixed convection parameter λ = s Gr/Re2 are studied. These parameters have great effects on velocity and temperature profiles, heat transfer coefficient, and skin friction coefficient at the moving surface. Results show that similarity solutions exist only when the condition n=2m-1 is satisfied. Critical values of λ, Nu/Re0.5 and Cf Re0.5 are obtained for predominate natural convection for different Prandtl numbers at m=-2, -6 and n=-5, and -13 respectively. Results also show that the effect of buoyancy is more significant for weak than for strong suction. Furthermore, critical Prandtl numbers where fw profiles have minimums are obtained for m=-2 and -6. Finally, critical values of λ, Cf Re0.5 are also obtained for predominate natural convection for both m=-2 and -6.
URI: http://hdl.handle.net/123456789/13593
ISSN: 0947-7411
Appears in Collections:College of Engineering

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