| 摘要 |
PURPOSE:To improve the transportation efficiency by setting the particle diameter to 1/3 or less of the pipe diameter and the mixing ratio to 10 or less when solid particles are transported through the Coanda spiral flow by a fluid, thus suppressing the abrasion on the inner wall of a conduit. CONSTITUTION:When the pressurized air is supplied into a conie-shaped cylinder pipe 2 from a small slit 2 having a curved wall surface 4, the powder fluid consisting of solid particles flows from outside, drawing the stream line alpha inclined towards a conduit 1 side by the Coanda effect and generating a negative pressure region at an flow inlet 5 on the opposite side, and the radius of the convergence fluid stream is reduced gradually, and the stream is provided with a turning vector, and a swirl stream is generated, added with a straight advance vector. The inclination tantheta of the cylinder pipe 2 is set to 1/4-1/8, and the inside diameter ratio between the conduit 1 and the cylinder pipe 2 is set to 1/2-1/5, and the solid particle diameter is set to less than 1/3 of the pipe diameter of a transportation conduit 1, and the mixing ratio between the solid particle and the fluid is set to 10 or less, preferably to 2-6. Therefore, the abrasion of the inside wall of the pipe can be suppressed, and the powder transportation at a superhigh speed is permitted, increasing the transportation efficiency.
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