Intensity Of Turbulent Fluctuations Research Articles

Turbulence intensity in dilute two-phase flows—2 Temperature fluctuations in particle-laden dilute flows

We deal with the temperature fluctuations of the carrier fluid and particles in turbulent two-phase flows. The analysis of the temperature fluctuations is based on the modified mixing-length theory, which was used previously to evaluate the intensity of turbulent fluctuations in two-phase polydisperse flows. The dependences of the temperature fluctuations of the interacting phases on the particle sizes, the mass content of the admixture and its composition and physical properties have been predicted. The effect of heat transfer by radiation on the intensity of temperature fluctuations in two-phase flow is estimated.

Fluctuation Intensity of Passive Species in a Turbulent Subsonic Jet

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.