INTERACTION BETWEEN THE MOTION OF PARTICLES AND THEIR TURBULENT CARRIER FLUID-FLOW

The turbulence occurring in the flow of the carrier fluid exerts a substantial influence on the motion of suspended particles or droplets. This influence is obvious, e. g. if fine particles are dispersed in free flows or deposited on free surfaces, bluff obstacles or channel walls. With application in aerosol science in mind, the interaction between dispersed phase and carrier fluid is described in terms of turbulence intensities, energy spectra, turbulence time scales and eddy diffusivities. Experimental results obtained for different important flow types are reviewed and compared with theoretical predictions. With regard to the latter, the different methods of treating theoretically turbulent two-phase flows of low concentration are discussed.