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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Heat Transfer Characteristics in a Cavity of a Symmetric Grooved Channel with Visco-elastic Fluid

Get access (open in a dialog) DOI: 10.1615/IHTC12.1260
6 pages

要約

A novel technique using the Barus effect of visco-elastic fluid for heat transfer augmentation in a recirculating region observed in a cavity between ribs on a heat transfer surface, where heat transfer is greatly reduced, was suggested. Flow visualization and heat transfer experiments in a cavity of a symmetric grooved channel have been performed for a surfactant solution selected as visco-elastic fluid. The results indicated that the visco-elastic fluid makes the recirculating region behind the upstream wall of the cavity very small, causing heat transfer augmentation. However, the heat transfer was greatly reduced in the region near the downstream wall of the cavity because a wide recirculating region was formed there under the condition where the cavity length Weissenberg number is smaller than unity. The mean Nusselt number then became almost the same as that of water in a cavity. Under the present conditions, the suggested method does not cause total heat transfer augmentation but the heat transfer characteristics in a recirculating region behind the upstream wall of the cavity can at least be improved.