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首页> 外文会议>Proceedings '96 China-Japan symjposium on particuology >Measurement of Plug Flow Properties$$$$ Uelocity of Particles Composing Plug at Front and Rear Ends
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Measurement of Plug Flow Properties$$$$ Uelocity of Particles Composing Plug at Front and Rear Ends

机译：塞流特性的测量$$$$前端和后端构成塞的颗粒的清晰度

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Velocity of particles composing plug at front and rear ends has been measured using Laser Doppler Velocimeter (LDV) in order to clarify the plug inner structure. The velocity data were obtained on condition that the pipeline was 38 mm in diameter and 60m long, and the particles were polyethylene pellets of diameter 1.5 mm. The velocity at the upper part of the plug was higher than that at lower part at the both ends. At the front end, the velocity of particles was higher than the plug movement velocity, at the rear end the velocity was lower. These results indicate that the particles composing plug at the front end are discharged toward the front air phase. Most of the previous studies treated the particles composing plug with uniform velocity. Some studies calculated the velocity by the dynamic numerical simulation; however, the experimental data have been insufficient. Additionally, the movement of the particles on the stationary layer were visualized to make the discharging flow pattern clear. The particles on the stationary layer near the pipe wall moved up to the upper part of the plug to be discharged at the front end; however, the particles on the center of the stationary layer were swept into the inner plug.
机译：为了阐明塞子的内部结构，已经使用激光多普勒测速仪（LDV）测量了构成塞子前端和后端的颗粒的速度。在管道直径为38 mm，长度为60m且颗粒为直径1.5 mm的聚乙烯粒料的条件下获得速度数据。塞子的上部的速度高于两端的下部的速度。在前端，粒子的速度高于塞子的运动速度，在后端，粒子的速度则低。这些结果表明，构成堵塞物的颗粒在前端朝着前空气相排出。以前的大多数研究都以均匀的速度处理了组成塞子的颗粒。一些研究是通过动态数值模拟来计算速度的。但是，实验数据还不够。另外，使颗粒在固定层上的运动可视化以使排出流型清晰。靠近管壁的固定层上的颗粒向上移动到塞子的上部，并在前端排出。然而，固定层中心的颗粒被扫入内塞。

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