Title: Double diffusive natural convection of smoke in a main flow

Authors: Katsuyoshi Kamakura, Hiroyuki Ozoe

Addresses: Toyama National College of Technology, 13 Hongo-machi, Toyama 939-8630, Japan. ' Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-8580, Japan

Abstract: The double diffusive natural convection of smoke in a horizontal main flow was numerically studied at the Prandtl number Pr = 0.71, the aspect ratio A = 1, the Rayleigh number Ra = 10⁷ – 10⁹, the Peclet number Pe = Re·Pr = 1000–3000, the buoyancy ratio N = 0.8 – 1.2 and the Lewis number Le = 0.5 – 5. Double diffusive phenomena with plumes occurred downstream at Ra = 10⁹. When the Peclet number is small, the smoke was extensively disordered downstream. When the Lewis number is smaller or greater than unity, the smoke was disordered downstream and separated into the thermal and solutal plumes. Then the lower side of smoke had strong plumes at Le > 1 and the upper side had strong plumes at Le < 1.

Keywords: double diffusion; natural convection; smoke; plumes; wind field.

DOI: 10.1504/PCFD.2005.006750

Progress in Computational Fluid Dynamics, An International Journal, 2005 Vol.5 No.3/4/5, pp.152 - 157

Published online: 05 Apr 2005 *

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