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 quasi-Lagrangian analysis provides expressions for all components of D ij and confirms the expectation that D ij is non-diagonal and nonsymmetric. The analysis also suggests the possibility that D 11 and D 12 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 distortion type analysis are also reported.
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