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Buoyancy effects on low-Reynolds-number turbulent flow in a horizontal square duct

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Sekimoto, Atshushi and Sekiyama, K. and Kawahara, Genta and Uhlmann, Markus and Pinelli, Alfredo (2009) Buoyancy effects on low-Reynolds-number turbulent flow in a horizontal square duct. In Turbulence, Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence, Heat and Mass Transfer - Rome, Italy, 14-18 September, 2009. ICHMT Digital Library Online . Begell House.

Official URL: http://www.dl.begellhouse.com/pt/references/1bb331655c289a0a,79a1a64252fdbc4b,137d47c51733f5e8.html


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Abstract

Direct numerical simulations of fully developed low-Reynolds-number turbulent flow in a horizontal square duct heated from below are performed at Richardson numbers 0 ≤ Ri ≤ 1.03 to investigate the buoyancy effects on the coherent structures near the walls, i.e. streamwise vortices and associated streaks, and on turbulence-driven secondary flow of Prandtl's second kind. It is found that cross-streamwise thermal convection which is represented by single large-scale circulation appears to affect the coherent structures and the mean secondary flow for Ri ≥ 0.02. As Ri is increased, the nearwall coherent structures are observed to appear more frequently in the region near one of the two corners on the wall, since they are swept along the wall towards the corner by the large-scale convection. The localization of the near-wall structures affects the profile of skin friction and heat transfer rate on the wall.


Item Type:Book Section
Subjects:Sciences > Physics
ID Code:22000
Deposited On:19 Jun 2013 11:45
Last Modified:12 Dec 2018 15:07

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