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Combined free‐and‐forced convection: II. Heat transfer in opposing flow
Author(s) -
Brown C. K.,
Gavvin W. H.
Publication year - 1965
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450430609
Subject(s) - grashof number , nusselt number , forced convection , thermodynamics , natural convection , heat transfer , work (physics) , mechanics , chemistry , reynolds number , materials science , physics , turbulence
The rate of heat transfer to air flowing downward at low velocities through a heated tube was studied. The apparatus has been described in a previous work. The investigation covered a flow rate ranging from 85 to 930 lb./hr.ft. 2 , ( N Rc ) from 380 to 6,900, ( N Gr ) from 0.18 × 10 6 to 7.3 × 10 6 and nominal wall temperatures of 100, 500 and 950°C. The local Nusselt number could be correlated with the Grashof number independently of its axial position, over a range of Grashof numbers not previously investigated. In particular, it was noted that a marked change in the slope of the ( N Nu )‐vs‐( N Gr ) curve occurred around a Grashof number of 10 6 .