Fundamental Experiments of a Sand Collector with an Injection at the Collecting Mouth:Effects of the Inner Diameter Ratio on the Concentration and the Local Efficiency

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In one proposal for an excellent, highly efficient collector, an injector is mounted at the collection mouth to fluidize the particle bed before particles are collected. In this paper, the inner diameter ratio of the injection mouth to the suction mouth is discussed, along with the ratio's effect on the concentration of particles and local efficiency at the collection section. Spherical glass beads are used as particles. This experiment clarifies that when the inner diameter ratio is too small, the velocity in the injection pipe is so high that the drop in pressure is very large whereas higher concentration is obtained. On the contrary, when the inner diameter ratio is too large, the flow area at the suction mouth becomes small and the beads are dispersed outside the collection region by the injection flow. As a result, an optimal value exists for the inner diameter ratio of a given inner diameter of the suction mouth and a given bead diameter. High local efficiency for the transportation of the beads is obtained at an inner diameter ratio equal to 0.28.
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