Semiempirical Model of the Drag Force Acting on an Obstacle in Downward Dense Particle Flows as per the Flow-Around Behavior

被引：0

作者：

Liu, Xiandong ^{[1
]}

Yang, Hairui ^{[1
]}

Zhang, Hai ^{[1
]}

Lyu, Junfu ^{[1
]}

Zhang, Yang ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Energy & Power Engn, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2023年 / 62卷 / 06期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

APPARENT VISCOSITY; GRANULAR FLOW; SLOW; BED;

D O I：

10.1021/acs.iecr.2c04034

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Determination of the flow-around drag force acting on an internal when particles downwardly flow around the internal is important for the safety of internals in the downward particle flow channel. In this study, the flow behaviors of particles downwardly flowing around different obstacles were investigated and a semiempirical drag force model was proposed based on the characteristics of the flow patterns. The proposed model was validated and key coefficients were correlated using the experimental data. The results indicate that there were three featured flow zones when particles downwardly flowed around an obstacle: the flow stagnant zone (disappear for triangular/conical obstacle), the slip-shear flow zone, and the flow separation zone. The stagnant zone angle and the flow separation angle were proposed to depict transition points of three flow zones when particles flowed around a cylindrical/spherical obstacle, and the two angles were found independent of the flow condition. A drag force model as per the flow patterns was proposed. The model decomposed the drag force into the compression force, the shear force, and the confinement force. The expressions of the compression stress, the shear stress, the effective area, and the confinement force were given. The mathematical form of the proposed model was validated and key coefficients in this model were also correlated using the experimental data. The average error of the drag force model was +/- 7.6% while the maximum error was within +/- 15%.

引用

页码：3001 / 3010

页数：10