Study of the particle motion induced by a vortex shaker
Study of the particle motion induced by a vortex shaker
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DOI：
10.1016/j.powtec.2017.08.026
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发表时间：
2017-12-01
影响因子：
5.2
通讯作者：
Morgeneyer, Martin
中科院分区：
文献类型：
--
作者：
Chakravarty, Somik;Fischer, Marc;Morgeneyer, Martin
为了研究石灰石粉尘的排放特性，在涡流振荡器的搅拌下，对氧化铝颗粒在石灰石粉尘上的示踪行为进行了研究。PEPT（正电子发射粒子跟踪）用于测量粒子的位置。人口密度计算为粒子在不同区域中存在的频率，分别划分两个水平轴和垂直轴。通过过滤掉所有低于临界距离d（crit）的位移来计算粒子的速度，以便不考虑由实验噪声引起的虚假运动。验证后，将该方法应用于涡旋振荡器实验的标准条件（ω = 1500 rpm，2 g粉末和开放试管）。虽然水平坐标和速度分量遵循对称分布，但垂直坐标的特征在于大的不对称平台。与试管（150 mm）相比，颗粒达到的高度（高达24.3 mm）较小。最大的速度被发现在试管的内壁附近，并在最高的高度，人口密度是最低的。粒子的平均速度为0.0613 m·s（-1），平均动能为8.4E-12 J。本研究所用的方法可直接应用于其它任何通过PEPT得到的数据，特别是小尺度系统。(C)2017爱思唯尔B. V.保留所有权利。
The behaviour of a traced alumina particle lying on limestone powders with similar features has been studied in a test tube agitated by a vortex shaker aiming at studying dust emissions from powders. PEPT (Positron Emission Particle Tracking) was used for measuring the particle's position. Population densities were computed as the frequency of the particle's presence in different regions dividing the two horizontal axes and the vertical axis, respectively. The velocities of the particle were calculated by filtering out all displacements inferior to a critical distance d(crit) so as not to consider spurious movements caused by experimental noise. After its validation, the methodology was applied to the standard condition of a vortex shaker experiment (omega = 1500 rpm, 2 g of powder and open test tube). While the horizontal coordinates and velocity components follow a symmetric distribution, the vertical coordinate is characterised by a large asymmetrical plateau. The heights reached by the particle (up to 24.3 mm) are small in comparison to that of the test tube (150 mm). The greatest velocities are found near the inner wall of the test tube and at the highest heights where the population densities are the lowest. The median velocity of the particle is 0.0613 m.s(-1) whereas its median kinetic energy is 8.4E-12 J. The method explicated in the present study is directly applicable to any other sets of data obtained through PEPT, especially if the system is of small dimension. (C) 2017 Elsevier B.V. All rights reserved.