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Titre :
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Heat transfer in laminar and turbulent flows in the thermal entrance region of concentric annuli : axial heat conduction effects in the fluid
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Auteurs :
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B. Weigand ;
M. Wolf ;
H. Beer
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Type de document :
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article/chapitre/communication
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Année de publication :
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1997
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Format :
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p.67-80
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Langues:
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= Anglais
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Catégories :
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THERMIQUE THERMODYNAMIQUE
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Mots-clés:
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TRANSFERT DE CHALEUR
;
ECOULEMENT LAMINAIRE
;
ECOULEMENT EN CONDUITE
;
ECOULEMENT TURBULENT
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Résumé :
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The present analytical study investigates the influence of axial heat conduction within the flow on the heat transfer in the thermal entrance region of a concentric annular duct with laminar and turbulent internal flow. The solution is based on a decomposition of the elliptic energy equation into a pair of first order partial differential equations. By using a new defined vector norm it is possible to obtain a selfadjoint eigenvalue problem for the extended Graetz problem even though the original convective diffusion operator is non-selfadjoint. The obtained exact analytical solutions for the Graetz problem with axial heat conduction are as simple to compute as the related solutions of the parabolic problem.
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Source :
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Heat and mass transfer, vol 33
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