Investigations of turbulence modulation in turbulent particle laden flows

This paper presents the results of experimental and numerical analyses of h igh particle laden turbulent flows. The dispersed phase consists of non-rea cting solid mono-dispersed particles with variable diameter between 60 mum and 1500 mum. Experiments using Laser Doppler Anemometer (LDA) and Phase Do ppler Anemometer (PDA) show in agreement with earlier investigations that s mall particles attenuate turbulence while large particles enhance turbulenc e. More detailed investigations are, however, needed to clearly identify an d quantify such influences. In order to obtain preliminary information abou t the performance of the k-epsilon model, mostly used for the majority of t he numerical models, in predicting the physical features of modulation, som e numerical calculation results obtained by use of Euler / Lagrange method and a modified version of the k-epsilon model are compared to the experimen tal data.