Diffusion of a Dusty Gas : Part 1, The Velocity Distribution of Turbulent Jet

Abstract

Turbulent jet of a dusty gas in a fully developed region is studied using following assumptions; an interaction force between the dust particles and the gas stream follows the Stokes law; a mean velocity of particulate phase is equal to that of gas stream, but fluctuating components of particulate phase are negligible as compared with those of gas stream; and the settling velocity of particles is small compared with the characteristic velocity of gas stream. A similar solution of velocity is obtained under the uniform concentration of dust particles. It is shown that eddy viscosity is reduced due to the presence of dust particles, and that rates of the decrement of axial velocity and of the spread of jet of dusty gas are small compared with those of gas jet. An applicable range of the present analysis is determined by the assumptions. Results of the analysis well explain experimental results by M. K. Laats.