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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

NUMERICAL COMPUTATION ON THE COMBINED EFFECT OF MAGNETIC FORCE AND NATURAL CONVECTION FOR CLUSTERING AND LEVITATING OF BROWNIAN PARTICLES

Get access (open in a dialog) DOI: 10.1615/IHTC13.p6.180
12 pages

Résumé

Small particles are difficult to treat and present report aims to treat small particles with using a strong magnetic field which becomes available recently. A compact size super-conducting magnet provides a magnetic induction of 10 T(Tesla= kg·s−2·A−1) or so in a bore space of a magnet. We found experimentally that small particles such as water mist are affected by the strong magnetic field. This report presents the numerical computation on the combined effect of magnetic force on the particles in the field of natural convection of air in which many Brownian particles are floating. A cylindrical enclosure is 3 cm high, 6 cm in diameter and heated from below and cooled from above with Pr = 0.71 and Ra = 104. The motion of a particle is modelled with Langevin equation. Other forces are drag, gravitational, magnetic and Saffman forces. 1000 particles of carbon particles are released. The Knudsen number Kn = λf/d = 0.0118 and the Stokes number St = 3.9×10−6 for d = 5 μm particle. The particles larger than 3μm are accumulated into a vortex centre of natural convection of air and clustering and levitating even in a convection flow field.