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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

NUMERICAL COMPUTATION FOR CLUSTERING OF FINE PARTICLES

Get access (open in a dialog) DOI: 10.1615/IHTC10.3920
pages 367-372

Sinopsis

This paper presents the direct numerical calculation for clustering of fine particles. The modeled regime is a vertical cylinder whose radius is equal to the height. At the bottom center of a cylinder, a point heat source is placed to induce natural convection. A number of fine particles are released near the heat source or dispersed in a whole domain. These fine particles are circulated in a cylinder under the Brownian force to cluster each other. The basic flow field is computed at Gr = 106 and Pr = 0.71. As for a particle, the calculation is carried out for 500, 1000 and 2000 particles of 0.1, 0.5 and 1 µm diameters in a vertical cylinder of 1.25 cm radius and height. The computation duration is 1000 seconds. It is found that particles tend to be trapped inside a vortex core at low velocity and the clustering of particles proceeds while floating there for many seconds.