Flow Mechanism of Plug Conveying of Solids in a Vertical Pipe

垂直管道中固体塞输送的流动机理

• 批准号: 01550146
• 负责人: TSUJI Yutaka
• 金额: $ 1.22万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550146/
• 关键词: PneumaTIC Conveying; Plug Flow; Gas-Solid Flow; Multiphase Flow; Supersonic Wave; Particle Concentration; 二次空気

Plug flow is widely used in pneumatic conveying of solid particles but its mechanism is still not well understood. Particularly in a vertical pipe, the plugs of solids are easy to collapse and therefore the local concentration of solids changes largely. The concentration is the most important parameter in the plug flow analysis, because the pressure drop is determined mainly by the concentration. Since satisfactory devices of solid concentration measurement are not available except those using radio activities, it was undertaken in the first fiscal year to develop a new and safe method of measuring the solid concentration in the pipe. For that purpose, supersonic wave was used in this work. The principle of the measurement is that sonic waves are dissipate when passing through solids. Along with experiments, the rate of dissipation is calculated theoretically.In the next year, a conveying pipeline was constructed and plug flows were investigated experimentally. First, the solids flow was observed. As predicted, the plug flow showed complicated flow patterns. It is also found that signal processing speed should be improved to apply the method developed in the first year to practical pneumatic conveying.

塞流是固体颗粒气力输送中广泛应用的一种流态，但其机理至今仍不清楚。特别是在垂直管道中，固体颗粒的堵塞物容易坍塌，因此局部固体浓度变化很大。在活塞流分析中，浓度是最重要的参数，因为压力降主要由浓度决定。由于除了使用放射性活动的装置外，没有令人满意的固体浓度测量装置，因此在第一个财政年度着手开发一种新的安全方法来测量管道中的固体浓度。为此，在这项工作中使用了超声波。测量的原理是声波在穿过固体时会消散。沿着实验，理论上计算了耗散率。第二年，建造了输送管道，并对塞流进行了实验研究。首先，观察固体流动。结果表明，活塞流呈现出复杂的流型。同时发现，要将第一年发展的方法应用于实际气力输送中，还需要提高信号处理速度。

项目成果

田中 敏嗣,鳥越 研児,川口 寿裕,辻 裕: "超音波による気中浮遊固体粒子群の濃度測定に関する研究" 日本機械学会論文集 B編. 57. 501-507 (1991)

Toshitsugu Tanaka、Kenji Torigoe、Toshihiro Kawaguchi、Yutaka Tsuji：“利用超声波测量空气中固体颗粒浓度的研究”，日本机械工程师学会会刊，B 版 57. 501-507 (1991)。

田中 敏嗣,鳥越 研児,川口 寿裕,羅道 敬,辻 裕: "超音波による気中浮遊固体粒子群の濃度測定に関する研究" 日本機械学会論文集B編. 57. (1991)

Toshitsugu Tanaka、Kenji Torigoe、Toshihiro Kawaguchi、Kei Rajo 和 Yutaka Tsuji：“利用超声波测量空气中固体颗粒浓度的研究”日本机械工程学会会刊，B 卷，57。（1991 年）

T. Tanaka, K. Torigoe, T. Kawaguchi and Y. Tsuji: "Measurement of Solid Concentration in Suspension Using Supersonic Waves" Trans. JSME. Vol. 57, No. 534. 501-507 (1991)

T. Tanaka、K. Torigoe、T. Kawaguchi 和 Y. Tsuji：“使用超声波测量悬浮液中的固体浓度” Trans。

田中敏嗣,鳥越研児,川口寿裕,羅道敬,辻裕: "超音波による気中浮遊固体粒子群の濃度測定に関する研究" 日本機械学会論文集.

Toshitsugu Tanaka、Kenji Torigoe、Toshihiro Kawaguchi、Takashi Rado 和 Yutaka Tsuji：“利用超声波测量空气中固体颗粒浓度的研究”日本机械工程师学会会议录。

T.Tanaka,K.Torigoe,T.Kawaguchi,Luo Dao Jing,Y.Tsuji: "On the Measurement of Particle Comcentration using Acoustic Waves" Second World Congress Particle Techuology.

T.Tanaka，K.Torigoe，T.Kawaguchi，罗道静，Y.Tsuji：“论用声波测量粒子浓度”第二届世界粒子技术大会。