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Combined free‐and‐forced convection: I. Heat transfer in aiding flow

1965; Wiley; Volume: 43; Issue: 6 Linguagem: Inglês

10.1002/cjce.5450430608

1939-019X

C. K. Brown, W. H. Gauvin,

Heat Transfer and Boiling Studies

Abstract A study of the rate of heat transfer to air at low velocities was performed in a heated stainless tube, 4.42‐in. inside diameter and 102‐in. long. The air flowed upward through the tube, under which conditions the buoyancy forces aided the forced flow. The investigation covered a Reynolds number range from 385 to 4,930, and nominal wall temperatures of 100, 500 and 950°C. For laminar aiding flow, the local Nusselt number could be correlated with ( N Gr / N Rc ). For turbulent flow, the local Nusselt number was correlated with the Grashof number independently of the axial position for fully‐developed flow, and agreed with published data for pure free convection.