DOI: 10.1615/TSFP2
MEASUREMENTS AND NUMERICAL PREDICTION OF FLOW AND PARTICLE FIELDS IN TURBULENT PARTICLE-LADEN FLOWS -TURBULENCE MODULATION
RESUMO
The objective of the present study is to analyze the influence of solid particles dispersed in a fluid on the fluid itself. This phenomenon, known as turbulence modulation, is investigated here by experimental as well as numerical methods. The study is restricted to the investigation of the respective turbulent properties. Experiments are performed in a specially designed vertical closed-circuit wind-tunnel. Air is used as continuous phase and solid non-reacting mono-dispersed particles of various diameters in the range from 120 to 480 µm act as dispersed phase. Phase-Doppler Anemometry (PDA) is used to measure fluid and particle velocities, respectively. In order to gain preliminary information in predicting the physical features of modulation with existing models, numerical simulations are performed in a first step using the k-ε model for turbulent flows, modified to allow for Euler-Lagrange gas-particle flow analysis. Experimental and numerical results are compared to each other. The results display very clearly the influence of the particle concentration and diameter. Parameters for generation and attenuation of continuous phase turbulence are identified.