| 大尺寸固体颗粒提升过程中管道内的固液两相流动特征 |
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| 引用本文： | 宋龙波,滕爽,曹骞,康灿,丁可金,李长江.大尺寸固体颗粒提升过程中管道内的固液两相流动特征[J].排灌机械工程学报,2021,39(11):1111-1117. |
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| 作者姓名： | 宋龙波 滕爽 曹骞 康灿 丁可金 李长江 |
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| 作者单位： | 1. 国家泵类产品质量检验中心(山东), 山东 淄博 255209; 2. 江苏大学能源与动力工程学院, 江苏 镇江 212013; 3. 中国船舶第七○四研究所, 上海 200031 |
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| 摘 要： | 为了研究不同性质的大颗粒固液两相流对深海采矿输送系统的影响,应用商用计算流体力学软件STAR-CCM+中的离散单元法(DEM),对垂直管道内不同工况时的流动特征进行了数值分析.研究结果表明:在输送含有不同粒径颗粒的固液两相流时,颗粒的平均速度随着颗粒直径的增大而下降;随着中间尺寸颗粒(dp=15.0 mm)体积比的增大,颗粒的平均速度降低,大颗粒的滑移速度降低,小颗粒的滑移速度升高;大颗粒趋向液体速度较低的区域聚集,而小颗粒趋向液体速度较高的区域聚集.在输送含有不同形状颗粒的固液两相流时,当颗粒的形状系数减小时,颗粒的平均速度先降低后增大,颗粒的滑移速度先增加后下降;相比于球形颗粒,形状系数较小的颗粒受到的壁面效应更加严重,更容易在壁面附近发生速度骤降;球形颗粒(颗粒的形状系数为1.0)的平均速度最高,平均滑移速度最低,颗粒速度沿管道径向的分布最为均匀.
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| 关 键 词： | 固液两相流动 固体颗粒 垂直管道 颗粒体积比 形状系数 |
| 收稿时间： | 2020-10-04 |
Solid-liquid two-phase flow characteristics in pipe during large solid particles lifting |
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| SONG Longbo,TENG Shuang,CAO Qian,KANG Can,DING Kejin,LI Changjiang.Solid-liquid two-phase flow characteristics in pipe during large solid particles lifting[J].Journal of Drainage and Irrigation Machinery Engineering,2021,39(11):1111-1117. |
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| Authors: | SONG Longbo TENG Shuang CAO Qian KANG Can DING Kejin LI Changjiang |
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| Institution: | 1. National Pump Product Quality Inspection Center(Shandong), Zibo, Shandong 255209, China; 2. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 3. 704th Research Institute of CSIC, Shanghai 200031, China |
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| Abstract: | In order to study the influence of large particle two-phase flow with different properties on the deep-sea mining transportation system, the flow characteristics in vertical pipe under different conditions were analyzed numerically by using the discrete element method(DEM)in commercial computational fluid dynamics(CFD)software STAR-CCM+. The results show that when transporting solid-liquid two-phase flow with different particle sizes, the average velocity of particles decreases with the increase of particle diameter. With the increase of the volume ratio of middle size particles(dp=15.0 mm), the average velocity of particles decreases, and the slip velocity of large particles decreases but that of small particles increases. Large particles tend to gather in the area with lower liquid velocity, while small particles tend to gather in the area with higher liquid velocity. When transporting solid-liquid two-phase flow with different shapes of particles, decreasing the particle shape coefficient causes that the average velocity of particles first decreases and then increases, the slip velocity of particles first increases and then decreases. Compared with spherical particles, particles with smaller shape coefficient suffer more serious wall effect and are prone to experience sudden velocity drop at the vicinity of wall. The average velocity of spherical particles(the shape coefficient of particles is 1.0)is the hig-hest, the slip velocity is the lowest, and the distribution of spherical particle velocity along the radial direction of the pipe is the most uniform. |
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| Keywords: | solid-liquid two-phase flow solid particles vertical pipe volume ratio of particles shape coefficient |
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