Diffusion of matter in the wall turbulent flow (5th report, local similarity of the fluctuating concentration field of the plume from a wall point source in a turbulent pipe flow)

摘要

In this report, we extend the similarity argument used in the previous report (1)to the mean square concentration fluctuation equation on the symmetrical plane of the wall point source plume in a turbulent pipe flow to find to similar solution for the mean square concentration fluctuation distribution. The main assumptions are the Lagrangean similar hypothesis and an appropriate eddy diffusivity distribution to the triple correlation term and the mixing length theory.