In the actual pneumatic conveying pipeline, the friction and collision between materials and with the wall and the uneven airflow in pipeline such a variety of reasons. The actual suspension speed of air velocity is larger than the material needed.
The movement of material particles in pipe flow status: in the vertical transporting pipe, the gravity direction of material particles is at the same vertical line with the air force direction. but in the opposite direction. As long as the air speed is greater than the material particles suspended velocity, the material particles will follow the flow and move upward. But in the turbulent air flow, because there is a component perpendicular to the flow phase, the air velocity in the piping is not well-distributed. The shape of the material particles are usually irregular, and collide with each other or with wall,which causes the material particles in a irregular curve. In the vertical transporting pipe, the material particles are well-distributed in the pipe. http://www.dgniasi.cn/
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