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Multiphase Science and Technology

ISSN Print: 0276-1459
ISSN Online: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v22.i1.10
pages 1-30

ANALYSIS OF PARTICLE INTERACTION WITH COHERENT STRUCTURES IN A TWO-PHASE MIXING JET

R. K. Decker
Faculty of Chemical Engineering, State University of Campinas, Cidade Universitaria "Zeferino Vaz," CP 6066, 13083-970, Campinas SP
H. F. Meier
Department of Chemical Engineering, Regional University of Blumenau, Rua Sao Paulo 3250, 89030-000 Blumenau SC
Udo Fritsching
Department of Particles and Process Engineering, University of Bremen; Foundation Institute of Materials Science, Badgasteiner Str. 3, D-28359 Bremen, Germany
M. Mori
Faculty of Chemical Engineering, State University of Campinas, Cidade Universitaria "Zeferino Vaz," CP 6066, 13083-970, Campinas SP

ABSTRACT

Mixing processes of particulates such as droplets or solid particles with gases are an essential feature of typical chemical engineering processes. A proper analysis and design of the gas-particle mixing process enhances process qualities and efficiencies. In this contribution, an experimental study of the interaction of gas phase flow coherent structures with particles in a two-phase jet flow is presented. Radial profiles of particle mean velocities, particle sizes, rms velocities, turbulence intensities, and the “interparticle arrival time (IAT)” distribution have been investigated by means of phase Doppler anemometry. The experiments have been executed in a jet at different axial and radial distances from the nozzle. The variation of the initial velocity conditions, particle diameter distributions, and particle loadings yield important information about the local flow structures and their effect on the macroscopic as well as the turbulent particle transport between the jet center and the outer shear layer. The interparticle arrival time distribution proves to be an important tool to identify regions where large-scale coherent structures influence the particle distribution and tend to form particle clusters. The derived extensive experimental data set for the particle behavior in a two-phase jet may serve as a base for the detailed validation of numerical simulations of dispersed two-phase flow behavior, including strong phase interactions between gaseous and particulate phases.

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