S. Limtrakul, P. Chaisermtawan, W. Tanthapanichakoon (Thailand), Y. Tsuji, T. Kawaguchi, and T. Tanaka (Japan)
modeling, simulation, plug flow, pipe, particle
Modeling of particle movement in a horizontal pipe is performed by Discrete Element Method (DEM). The motion of individual particle is based on the fluid force acting on the particle and the contact force between particles. The contact force is modeled by using the analogy of spring, dash-pot and friction slider. Fluid force acting on particle is considered fromt he conservation of momentum. The flow patterns of plug flow of particle in a horizontal pipe were illustrated. The gas velocity was varied in the range of 2 to 10 m/s. It was found that the particles are settle to the bottom of the pipe forming the stationary layer at very low gas velocity. The plug flow is not formed at this condition. At very higher gas velocity the plug flow are irregular and unstable. Regular plug flow was found at the gas velocity of 3 m/s. Plug length is dependent on the gas velocity and particle size. It decreases with increasing particle size but increases with increasing gas velocity.
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