An investigation of mixed convection and flow reversal in a vertical annular duct is presented with reference to laminar and fully-developed flow of a power-law fluid. The boundary surfaces are supposed to be isothermal, with unequal temperatures. The momentum balance and the energy balance equations as well as the viscous stress constitutive equation are solved analytically in order to obtain the velocity field, the viscous stress field and the temperature field. First, two special cases are analyzed: mixed convection of a Newtonian fluid; forced convection of a power-law fluid. Then, in the general case, the evaluation of the friction factors is employed to determine the conditions for the occurrence of flow reversal, for fixed values of the power-law index and of the ratio between the duct inner and outer radii.

Barletta A. (2000). Combined forced and free flow of a power-law fluid in a vertical annular duct. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 43(19), 3673-3686 [10.1016/S0017-9310(00)00006-5].

Combined forced and free flow of a power-law fluid in a vertical annular duct

Barletta A.
2000

Abstract

An investigation of mixed convection and flow reversal in a vertical annular duct is presented with reference to laminar and fully-developed flow of a power-law fluid. The boundary surfaces are supposed to be isothermal, with unequal temperatures. The momentum balance and the energy balance equations as well as the viscous stress constitutive equation are solved analytically in order to obtain the velocity field, the viscous stress field and the temperature field. First, two special cases are analyzed: mixed convection of a Newtonian fluid; forced convection of a power-law fluid. Then, in the general case, the evaluation of the friction factors is employed to determine the conditions for the occurrence of flow reversal, for fixed values of the power-law index and of the ratio between the duct inner and outer radii.
2000
Barletta A. (2000). Combined forced and free flow of a power-law fluid in a vertical annular duct. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 43(19), 3673-3686 [10.1016/S0017-9310(00)00006-5].
Barletta A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/874069
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