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Non-Oberbeck-Boussinesq effects in a turbulent tall water-filled differentially heated cavity

DOI: 10.1615/ICHMT.2015.THMT-15.720
pages 367-370

D. Kizildag
Heat and Mass Transfer Technological Center (CTTC) Universitat Politecnica de Catalunya - BarcelonaTech (UPC) Colom 11, 08222 Terrassa, Barcelona, Spain

Ivette Rodriguez
Heat and Mass Transfer Technological Center (CTTC) Universitat Politecnica de Catalunya - BarcelonaTech (UPC) Colom 11, 08222 Terrassa, Barcelona, Spain

F. Xavier Trias
Heat and Mass Transfer Technological Center (CTTC) Universitat Politecnica de Catalunya - BarcelonaTech (UPC) Colom 11, 08222 Terrassa, Barcelona, Spain; and Institute of Mathematics and Computing Science, University of Groningen, The Netherland

Assensi Oliva
Centre Tecnologic de Transferencia de Calor (CTTC), Universitat Politecnica de Catalunya (UPC), Colom 11, 08222 Terrassa, Barcelona, Spain

C. D. Perez-Segarra
Heat and Mass Transfer Technological Center (CTTC) Universitat Politecnica de Catalunya - BarcelonaTech (UPC) Colom 11, 08222 Terrassa, Barcelona, Spain

Résumé

The present work studies the non-Oberbeck-Boussinesq (NOB) effects in a tall water-filled differentially heated cavity by means of direct numerical simulation. The obtained results reveal significant NOB effects for this configuration, due mainly to the dissimilar flow behavior in the vertical boundary layers. Consequently, aspects like the transition to turbulence and flow symmetry are affected. Instantaneous flow structures and mean flow variables are provided in order to gain insight into the complex phenomena such as turbulent mixing and interaction between the hot and cold boundary layers.

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