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A numerical model of particle collision for a gas-solid two-phase flow in a vertical riser

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A numerical simulation of a gas-solid two phase flow of coarse particles in a vertical riser is performed to examine the influence of collision between particles by using a probability model. We use particles of both uniform size and mixed size, and assume the air velocity profile as uniform or a one-seventh-power law. It is shown that particle collision promotes particle dispersion both in the axial and radial direction of the pipe, especially when the velocity difference among the particles is large.

Affiliations: 1: Mechanical Engineering Department, Kurume Institute of Technology, 2228 Kamitsu-Machi, Kurume 830, Japan; 2: Mechanical Engineering Department, Kyushu Institute of Technology, 1-1 Sensui-Cho, Tobata-Ku, Kitakyushu 804, Japan


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