Suspension and turbulence modification effects of solid particulates on a horizontal turbulent channel flow
Suspension and turbulence modification effects of solid particulates on a horizontal turbulent channel flow
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DOI：
10.1088/1468-5248/3/1/019
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发表时间：
2002
影响因子：
1.9
通讯作者：
K T Kiger †;C. Pan §
中科院分区：
文献类型：
--
作者：
K T Kiger †;C. Pan §
给出了水平固/液通道内颗粒的湍流修正和悬浮机理的实验测量结果。该测量技术利用同步两相粒子图像测速技术来检测瞬时颗粒-流体结构，并获得相关的颗粒-流体统计信息来描述相间的双向耦合。结果表明，颗粒的存在明显改变了流体的平均运动，即使体积质量负荷只有10−4量级。载体相湍流性质也发生了改变，壁面摩擦速度有效增加约7%，外流法向和切向雷诺应力增加约8-10%(y/h>；0.1)。流动中的颗粒表现出平均流向速度的滞后，而颗粒附近的局部流向滑移速度接近可以忽略的水平。在c中..。
Experimental measurements detailing the turbulence modification and suspension mechanism of particulates within a horizontal solid/liquid channel flow are presented. The measurement technique utilized a simultaneous two-phase particle image velocimetry method to examine the instantaneous particle-fluid structure, and to acquire correlated particle-fluid statistics to describe the two-way coupling between the phases. The results show that the presence of the particles distinctly alters the mean fluid motion, even though the bulk mass loadings are only on the order of 10−4. The carrier phase turbulence properties are also altered, showing an effective increase in the wall friction velocity of approximately 7%, and an increase of the normal and shear Reynolds stress by approximately 8-10% in the outer flow (y/h > 0.1). The particles in the flow exhibited a lag in the mean streamwise velocity, while the local streamwise slip velocity in the vicinity of the particle was found to be near negligible levels. In c...