オリフィスからの粒体の流出速度
1952 年 16 巻 3 号 p. 86-89
詳細
1952 年 16 巻 3 号 p. 86-89
Combined with the formula of the bottom pressure in a column of powder, p=(B/4μ)ραp…(1), the author derived a simple equation of solid dischage rate through orifice from the experimental results with sand, quartz and active earth powder ranging 30-150 Mesh, and expressed it in a nomograph in Fig. 5. Vertical glass pipes of 1/2" and 1"φ were used as the apparatus, illustrated in Fig. 1, with orifices of 9.0, 8.15, 6.5, 6.3, 5.3, 4.0, 3.9 and 2.3mm. in diameters at the bottom of it. Combining the above equation with the general orifice equation u=c√2gΔh…(2), the author proposed the following equation, u=c√gB/2μ(cm/sec)…(3), or W=(π/4)cραp√gB5/2μ(gr/sec)…(5).
The calculated values of the discharge coefficient from the experimental data, are about c=0.5-0.7, and c=0.6 on the average, similar to that in fluid orifice equation. The contracted flows were also observed.
