Abstract
The equation for the turbulent fluctuation intensity of a passive scalar for incompressible shear flow was applied to a subsonic circular jet, using phenomenological diffusivities, for both the diffusion of the scalar mean and mean square fluctuation of the scalar, to determine the values of these diffusivities which give the best agreement between the calculated self-similar radial profile of the fluctuation intensity and experimental measurements. From experimental values in smoke jets and heated jets of the ratio of the fluctuation intensity to mean on the centerline and their radial profiles, it appears that the turbulent diffusivity for the mean square fluctuations is approximately equal to the turbulent diffusivity for the mean values of the scalar. The coefficient for turbulent dissipation which was treated as an eigenvalue in the calculation is in good agreement with the expected value.
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