On the Behavior of Air-Solids Mixture in a Pipeline for Pneumatic Conveyance with a Single or Double T-Branches

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Flow characteristics of air-solids mixture in a horizontal pipe-line with a single or double T-branches connected vertically to a main pipe are described. The pressure losses of a single T-branches and mutual interference effects of double T-branches are obtained experimentally and the behavior of solids in a pipeline and branches is analyzed using a one dimensional flow model. The branching loss of a main pipe with a single T-branch decreases as the solid loading ratio increases, and for double T-branches the upward branch has greater influence on the branching loss of the downward one far downstream that the case with air flow alone. When particles are decelerated in the flow direction, a distance necessary to reach the steady velocity is fare longer than when accelerated. Some attempts are made to explain the experimental results with a theoretical analysis.
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