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ISSN オンライン: 2642-0554

EFFECTS OF WALL ROUGHNESS IN A GAS-PARTICLE TURBULENT VERTICAL CHANNEL FLOW

Koji Fukagata
Department of Mechanical Engineering, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522,Japan

Said Zahrai
ABB Corporate Research - 721 78 Vasteras - Sweden; FaxenLaboratoriet, Kungl. Tekniska Hogskolan 100 44 Stockholm, Sweden

Fritz H. Bark
FaxenLaboratoriet, Kungl. Tekniska Hogskolan 100 44 Stockholm, Sweden

Shunsuke Kondo
Department of Quantum Engineering and Systems Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

要約

Gas-particle turbulent channel flows are studied using the Lagrangian particle tracking coupled with large eddy simulation (LPT-LES). A turbulent channel flow of air at Reτ = 644, loaded with 70 μm copper particles at a mass fraction of 2 % and a flow with 50 μm glass particles at the same condition are simulated. Small amount of roughness is introduced at the walls and its influence on the statistics of particles is investigated. The statistics of the highly inertial particles, i.e. 70 μm copper particles, are found to be largely modified in the whole channel due to the presence of the wall roughness, and a tendency similar to the experimental data by Kulick et al. (1994) is observed. The statistics of the particles with smaller inertia, i.e. 50 μm glass particles, are less influenced by the wall roughness assumed in the present study.