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Mixed convection flow of a power‐law fluid in horizontal ducts
Author(s) -
Tomcej R.,
Nandakvmar K.
Publication year - 1986
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.5450640505
Subject(s) - laminar flow , grashof number , mechanics , nusselt number , boussinesq approximation (buoyancy) , combined forced and natural convection , buoyancy , heat transfer , shear thinning , physics , natural convection , power law fluid , heat flux , thermodynamics , classical mechanics , newtonian fluid , rayleigh number , reynolds number , viscosity , turbulence
The laminar mixed convection heat transfer of a non‐Newtonian fluid modelled by a power‐law constitutive equation is studied. The equations of motion subject to the Boussinesq approximation and an axially uniform heat flux and peripherally uniform wall temperature condition are discretized by finite difference approximation and are solved by the successive relaxation method. Dual solutions with two‐cell and four‐cell patterns have been observed in certain regions of the parameter space. The secondary flow caused by the buoyancy force has a shear thinning effect for pseudoplastic fluids. The Nusselt number, however, always increases with increasing Grashof number.