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Yang, Zhenyu; Yan, Fei; Tu, Panpan; Zhu, Rui
Particuology, August 2023, 2023-08-00, Volume: 79Journal Article
In the pneumatic conveying process, particles move to the bend under the influence of inertia to form a particle rope, which will cause serious wear between the particles and the pipe wall, and then the dune model is designed and installed in the 90° bend to reduce energy consumption and wear in this study. Firstly, the minimum pressure drop velocity of particles transported by different size dune models was obtained through experimental study. Then the energy saving mechanism of the dune model is studied by CFD-DEM coupling. The experimental results show that the installation of the dune model reduces the minimum pressure drop velocity. The numerical simulation results show that the number of collisions between the particles and the tube wall in the vertical tube decreases after the installation of the dune model, which reduces the energy loss. Moreover, the increasing of tail size of the dune model is beneficial to the diffusion and acceleration of the particles in the vertical tube. Display omitted •Dune model is installed in a 90° bend to change flow pattern of particles in bend-vertical pipe.•Increasing tail size of dune model facilitates particle dispersion in vertical tube.•Dune model reduces the friction between particles and pipe wall.•Installation of a dune model reduces mutation mode in velocity of gas and particle phases.
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