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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v31.i1-2.110
pages 47-51

Heat Transfer from the Surface of an Inner Annulus with Spherically Shaped Indentations in a Flow with Variable Fluid Properties

A. V. Turkin
Moscow, Russia
A. G. Sorokin
All-Union Heat Engineering Institute after F. E. Dzerzhinsky, Moscow, USSR
O. N. Bragina
All-Union Heat Engineering Institute after F. E. Dzerzhinsky, Moscow, USSR
N. N. Yakovleva
Moscow, Russia
I. B. Aleshina
Moscow, Russia

RÉSUMÉ

Heat transfer and friction for a turbulent air flow in an annulus with indented inner wall are studied. The inner wall is uniformly heated and the outer wall is insulated. It is shown that for wall-to-bulk temperature ratios greater than 1.15 the Nusselt number is independent of the above parameter. Heat transfer and friction factors are 60 and 35% higher than those in a smooth channel, respectively.


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