Diffusion behind a line source in grid turbulence
Abstract
The flow considered is the thermal wake downstream of a fine heated wire in grid turbulence. The inability of generallyapplicable turbulent diffusion models and secondorder closures to calculate the mean and variance of the temperature is reviewed. Calculations based on the transport equation for the joint probability density function (pdf) of velocity and temperature show good agreement with measurements of mean temperature but not with those of the variance. Better calculations of the variance are obtained with a method based on the joint pdf conditional on the lateral velocity at the source.
 Publication:

4th Symposium on Turbulent Shear Flows
 Pub Date:
 1984
 Bibcode:
 1984stsf.proc...17A
 Keywords:

 Flow Theory;
 Thermal Diffusion;
 Turbulence;
 Probability Density Functions;
 Variance (Statistics);
 Wakes;
 Fluid Mechanics and Heat Transfer