Fully developed mixed convection and flow reversal in a vertical rectangular duct with uniform wall heat flux
作者： A. Barletta
DOI: 10.1016/S0017-9310(01)00160-0
关键词: Pipe flow 、 Duct (flow) 、 Nusselt number 、 Laminar flow 、 Materials science 、 Thermodynamics 、 Combined forced and natural convection 、 Mechanics 、 Heat flux 、 Fanno flow 、 Natural convection
摘要: Abstract Combined forced and free flow in a vertical rectangular duct is investigated for laminar fully developed regime. The velocity field, the temperature friction factor Nusselt number are evaluated analytically by employing finite Fourier transforms. thermal boundary condition considered an axially uniform wall heat flux peripherally temperature, i.e. H1 condition. necessary sufficient onset of reversal determined either case upward cooled or downward heated duct. special convection, purely buoyancy-driven flow, discussed. occurrence effects pre-heating pre-cooling fluid analysed. It pointed out that although these occur ducts, they not present circular ducts parallel-plate channels.
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