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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

ALGEBRAIC SCALAR-FLUX MODELLING FOR TURBULENCE WITH THE AID OF LES OF TURBULENT HEAT TRANSFER THROUGH A SHEAR-FREE INTERFACE

Get access (open in a dialog) DOI: 10.1615/IHTC11.3740
pages 235-240

Sinopsis

A new explicit algebraic gradient diffusion model for turbulent scalar (heat) flux in forced convection regimes is proposed. This model complies with the linearity and independence principles for passive scalar. For satisfying these, the model coefficients/functions do not include any turbulent scalar variable such as the temperature variance. The model thus does require solving transport equations for turbulent quantities of the scalar field. The rationale of the model has been initially discussed with the LES data presently performed under various conditions including shear-free boundaries. The proposed model is applicable to a wide range of passive scalar fields by being coupled with the nonlinear k-ε-A three equation model (Suga, 1997) for dynamic fields. Particularly, it has been confirmed that the model is able to capture the components of turbulent heat flux vectors in wall shear flows at least in the range of 0.025 ≤Pr≤ 95. Moreover, it successfully distinguishes the heat flux characteristics near shear-free boundaries.