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Experimental Results on Mixed-Convection Around a Vertical Heating Cylinder Cooled by a Cross-Flow Air-Circulation

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1090
pages 523-526

Bernard Duret
UMR6614-CORIA, Technopole du Madrillet, BP 12, Avenue de l'Universite, 76801 Saint-Etienne du Rouvray Cedex, France

J. C. Bonnard
CEA DEN 17, Rue des Martyrs, F-38054 Grenoble Cedex, France

T. Chataing
Commissariat à l'Energie Atomique, DEN/DNT/SE2T, Grenoble, France

Sophie Bournaud
EDF R&D, Dept. MFEE, 6 Quai Watier BP 49, F-78401 Chatou Cedex, France

D. Colmont
EDF R&D, Dept. MFEE, 6 Quai Watier BP 49, F-78401 Chatou Cedex, France

Abstrakt

Within the framework of radioactive waste management, the VALIDA program, co-financed EDF/CEA, started to provide reliable data for the validation of numerical tools used to model the cooling of spent nuclear-fuel containers in dry storage facilities. The design of such facilities implies thermal-aeraulic calculations in order to predict containers and wall temperatures. VALIDA experiments were carried out in this way on a finite circular heated cylinder mounted vertically in a wind tunnel cooled by a cross-flow air circulation. The results show that the airflow pattern strongly depends on the ratio of the buoyancy to the inertia force on the one hand and on the upstream turbulence intensity on the other hand. Zones where experimental convective transfers involve predominately forced or natural convection are distinguished thanks to established heat transfer correlations. A dimensionless Bo* number is defined to characterize the experimental flow regimes obtained.

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