TY - GEN

T1 - Large eddy simulation of variable property turbulent flow in a vertical channel with buoyancy effects and heat transfer

AU - Lee, Joon Sang

AU - Pletcher, R. H.

PY - 2001

Y1 - 2001

N2 - Turbulent combined flow of forced and natural convection was investigated using large eddy simulations (LES) for a vertical channel flow with significant heat transfer. The walls were maintained at constant temperatures, one heated and the other cooled, at temperature ratios of 1.01, 1.99 and 3.00. Results showed that aiding and opposing flows emerge near the heated and cooled walls, respectively, while the pressure gradient drives the mean flow upwards. Buoyancy effects on the mean velocity, temperature, and turbulent intensities were observed near the walls. In the aiding flow, the turbulent intensities and heat transfer were suppressed and the flow was relaminarized at large values of Grashof number. In the opposing flow, however, turbulence was enhanced with increasing velocity fluctuations.

AB - Turbulent combined flow of forced and natural convection was investigated using large eddy simulations (LES) for a vertical channel flow with significant heat transfer. The walls were maintained at constant temperatures, one heated and the other cooled, at temperature ratios of 1.01, 1.99 and 3.00. Results showed that aiding and opposing flows emerge near the heated and cooled walls, respectively, while the pressure gradient drives the mean flow upwards. Buoyancy effects on the mean velocity, temperature, and turbulent intensities were observed near the walls. In the aiding flow, the turbulent intensities and heat transfer were suppressed and the flow was relaminarized at large values of Grashof number. In the opposing flow, however, turbulence was enhanced with increasing velocity fluctuations.

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M3 - Conference contribution

AN - SCOPUS:0347586787

SN - 0791835332

SN - 9780791835333

T3 - Proceedings of the National Heat Transfer Conference

SP - 1839

EP - 1850

BT - Proceedings of the 2001 National Heat Transfer Conference Volume 2

T2 - 2001 National Heat Transfer Conference (NHTC2001)

Y2 - 10 June 2001 through 12 June 2001

ER -