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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Size Effect of the Flow Path on the Flow and Heat Transfer Characteristics in a Cavity Swept by a Visco-Elastic Fluid

Get access (open in a dialog) DOI: 10.1615/IHTC15.hex.009449
pages 3727-3741

Résumé

Two-dimensional numerical computations for visco-elastic fluid flows have been performed to investigate the size reduction effect of the flow path on flow and heat transfer characteristics in a cavity mounted between parallel plates. The cavity depth was reduced from 20 to 1 mm while the ratio of the cavity length and of the distance between parallel plated to the cavity depth were kept constant at 5 and 2 as the geometric similarity was kept. The solvent Reynolds number was also kept at 100. Flow and heat transfer characteristics were calculated with three types of Giesekus fluids having different zero-shear viscosities. From the results, it was found that the size reduction of the flow path causes the pressure loss reduction and the heat transfer enhancement until a mid-range around 5 mm of the cavity depth, but that the heat transfer is extremely reduced with the size reduction after taking a peak value. The zero-shear viscosity reduction weakened the flow penetration into the cavity due to the Barus effect. The mean Nusselt number and the pressure coefficient were correlated with wall Reynolds number rather than the elastic parameters as Weissenberg number or elasticity number. The overall heat transfer performance considering the pressure loss penalty is worse, but the heat transfer performance on the cavity bottom was larger than that of water in low wall Reynolds number region when the cavity depth is large.