Effects of shear on the turbulent diffusivity tensor
Abstract
Earlier measurements of some components of the turbulent diffusivity tensor D(ij) in a nearly homogeneous turbulent shear flow with constant mean temperature gradient parallel to the mean shear are now supplemented with measurements of additional components in the same flow but with a mean temperature gradient perpendicular to both mean velocity and mean shear. A quasiLagrangian analysis provides expressions for all components of D(ij) and confirms the expectation that D(ij) is nondiagonal and nonsymmetric. The analysis also suggests the possibility that D(11) and D(21) might become positive at sufficiently large values of mean shear. Independent estimates of D(ij) based on a numerical simulation of homogeneous shear flow as well as on a rapid distortiontype analysis are also reported.
 Publication:

International Journal of Heat and Mass Transfer
 Pub Date:
 January 1985
 Bibcode:
 1985IJHMT..28..265T
 Keywords:

 Homogeneous Turbulence;
 Shear Flow;
 Thermal Diffusivity;
 Turbulent Diffusion;
 Turbulent Heat Transfer;
 Heat Flux;
 Reynolds Stress;
 Temperature Distribution;
 Turbulent Heat Transfer;
 Fluid Mechanics and Heat Transfer