In 1921 GI Taylor introduced (with little discussion) the notion that the dispersion of a
conserved passive scalar in a turbulent flow is determined by the motion of fluid particles …

We consider the mixing of passive scalars transported in turbulent flow, with a molecular
diffusivity that is large compared to the kinematic viscosity of the fluid. This particular case of …

In 1965 Sullivan made many measurements of concentration in dye plumes in the surface
layer of Lake Huron with the primary purpose of estimating the distance–neighbour function …

The objectives of this paper are (i) to establish analytically some important features of the
scalar diffusion process in turbulence and (ii) to derive a closure model for this process in …

Direct numerical simulation (DNS) data are presented to study differentially diffusing
conserved scalars in isotropic turbulence. The two scalars are initially identical but …

The spectral turbulent diffusivity (STD) theory, originally deduced from a spectral
generalization of the gradient-transfer theory (Berkowicz & Prahm 1979), is here derived …

In this Brief Communication we describe a consistent method for calculating the conditional
scalar dissipation (or diffusion) rate for inhomogeneous turbulent flows. The model follows …

The problem of the interference between turbulent and molecular diffusion is investigated. A
decorrelating mechanism leading to a depletion of turbulent transport was discussed by …

It is shown that measurements of the statistical properties of the concentration distributions of
dispersing scalars taken from many different turbulent shear flows have a great number of …

Scaling properties of a normalized concentration difference in a turbulent flow containing
two scalars of unequal diffusivity are determined by similarity analysis and numerical …