Experimental flow characterization of sand particles for pneumatic transport in horizontal circular pipes
Experimental flow characterization of sand particles for pneumatic transport in horizontal circular pipes
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DOI：
10.1016/j.powtec.2016.01.014
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发表时间：
2016-05
影响因子：
5.2
通讯作者：
T. Khan;Y. Dai;M. Alshehhi;L. Khezzar
中科院分区：
文献类型：
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作者：
T. Khan;Y. Dai;M. Alshehhi;L. Khezzar
本文通过实验研究，模拟了不同流动条件下水平透明管道中空气-沙粒湍流的流动特性。实验分析的重点是确定固体颗粒从水平砂层中的临界拾取速度。主要研究了料层高度和管径对吸料速度的影响。通过外推作为砂层上方校正速度的函数绘制的重量损失曲线来确定临界拾取速度。实验结果表明，料层高度和管径对吸料速度有显著影响。文中还讨论了跃移速度和沙丘形成机制。发现固体颗粒的临界拾取速度随着堵塞比和管道直径的增加而增加。较大砂床高度的倾斜角导致前缘对进入层上方减小的横截面积的气流的影响。砂粒拾取率被发现随着时间的推移，作为一个结果，降低层的高度。实验结果已与以前的研究进行了相关和比较。
This work presents an experimental study carried out to simulate characteristics of turbulent air-sand particles flow through transparent horizontal pipes with various flow conditions. Experimental analysis focuses on the determination of critical pickup velocity of the solid particles from the horizontal sand layers. Mainly the effects of layer height and pipe diameter on the pickup velocity are investigated. Critical pickup velocity is determined by extrapolating the weight loss curves plotted as a function of corrected velocity above the sand layer. Experimental results show significant effects of layer height and pipe diameter on the pickup velocity. Saltation velocity and dune formation mechanisms are also discussed. Critical pick up velocity of solid particles is found to increase with increasing blockage ratio and pipe diameter. Inclination angle for larger sand bed heights caused leading edge effect on air flow entering the reduced cross sectional area above the layer. Sand particles pickup rate is found to decrease with time as a consequence of decreasing layer height. Experimental results have been correlated and compared with previous studies.