EXPERIMENTAL STUDY OF FLUID-SOLID TWO-PHASE FLOW IN A VERTICAL TUBE
-
摘要: 主要探讨竖直管道中不同颗粒级配、流体流速条件下的固-液两相流动的流态化规律.首先通过量纲分析获得关键控制参数,然后以玻璃珠(粒径:0.25mm~2.0mm)、粉细砂(d10=0:044mm)两种固体和水为实验介质,开展了两相流动流态化实验,考虑流体流速(相对于管道雷诺数介于640~3300之间)和颗粒级配的影响.通过分析发现:具有均匀粒径分布的玻璃珠床,床层膨胀高度随流速的增加而增加,流速与浓度的对数呈线性关系,与Richardson-Zaki公式一致;具有较宽粒径分布的粉细砂,细颗粒随水流逐渐流出管道,剩余颗粒质量与雷诺数呈指数递减趋势.Abstract: This paper presents an experimental study of the solid-water two-phase flow with different solid grain size distributions and flow velocities. First, the controlling parameters are obtained through the dimensional analysis, then a two phase flow is created by using glass beads(grain size:0.25 mm-2.0mm) and sands(d10=0:044 mm), respectively. The effects of the Reynolds number Re(640-3300) and the solid grain size are investigated. The results show that for the glass bead bed of mean grain sizes, the height of the bed in the tube increases linearly with the Reynolds number. For the sands of a wide particle gradation range, the small grains are flushed out of the tube and the residue mass decreases with the Reynolds number exponentially. The results might help the evaluation of the elevation of the soils containing the gas hydrate under the seafloor.
-
Keywords:
- two-phase flow /
- grain size /
- Reynolds number /
- concentration
-
-
1 刘大有. 二相流体动力学. 北京:高等教育出版社, 1993 2 Nielsen P. Coastal Bottom Boundary Layers and Sediment Transport. Singapore:World Scientific, 1992 3 Richardson JF, Zaki WN. Sedimentation and fluidisation:part 1. Transactions of the Institution of Chemical Engi-neers, 1954, 32:35-53 4 Baldock TE, Tomkins MR, Nielsen P, et al. Settling veloc-ity of sediments at high concentrations. Coastal Engineer-ing, 2004, 51:91-100 5 陈子彤, 刘文礼, 赵宏霞等. 干扰床分选机分选粗煤泥的试验研究. 煤炭工程, 2006, 5:69-70 6 刘文礼, 陈子彤, 位革老等. 干扰床分选机分选粗煤泥的规律研究. 选煤技术, 2007, 4:11-13 7 费祥俊. 浆体与颗粒物料输送水力学. 北京:清华大学出版社, 1994 8 夏建新, 倪晋仁, 黄家桢. 锰结核在垂直管路输送过程中的压力损失. 泥沙研究, 2002, 2:22-28 9 姜龙. 粗颗粒垂直管水力提升速度与浓度的实验研究.[博士论文]. 北京:清华大学水利水电工程系, 2005 10 赵立娟. 不同粒径泥沙管道水力输送阻力特性研究.[博士论文]. 南京:河海大学, 2002 11 张钦礼, 姜志良, 王石等. 高浓度超细全尾砂充填料浆管道输送阻力模型. 科技导报, 2014, 32(24):51-55 12 田龙, 李鹏程, 姜龙等. 垂直管固体物料水力输送浓度的研究. 泥沙研究, 2006, 2:72-76 13 桂夏辉, 李延锋, 刘炯天等. 液固流化床内颗粒沉降特性试验研究. 煤炭学报, 2010, 35(8):1374-1379
计量
- 文章访问数: 770
- HTML全文浏览量: 9
- PDF下载量: 894
下载:
