A numerical investigation on segregation in gas-fluidized beds of short, flexible fibers

Wang, Siyuan; Shen, Kai; Xiong, Hongbing; Lin, Jianzhong; Guo, Yu

doi:10.1016/j.apt.2023.104304

Advanced Powder Technology

2024

DOI: 10.1016/j.apt.2023.104304

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A numerical investigation on segregation in gas-fluidized beds of short, flexible fibers

Siyuan Wang,

Kai Shen,

Hongbing Xiong

et al.

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2024

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Cited by 2 publications

References 35 publications

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3D Flexible Ribbon Chain Model for Simulating Dynamic Behaviors of Flexible Ribbon Particles in a Pneumatic Conveying Dryer

Huang,

Zhang,

Ding

et al. 2024

Ind. Eng. Chem. Res.

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The pneumatic conveying drying process is widely used due to the high mass-and heat-transfer efficiency between the gas and solid phases, large dehydration rate, and wide range of operation conditions. The flexible ribbon particles are often involved in the pneumatic conveying drying of agricultural products, food, and biological products. These types of particles are easy to hold together due to the flexibility and the nonuniformity of ribbon shape. It is important to understand the dynamic behaviors of flexible ribbon particles in a pneumatic conveying dryer. Therefore, research on flexible ribbon particles in a pneumatic conveying dryer is necessary. However, previous studies were scarcely concerned about the particle of this special type. The flexible ribbon particles in the gas−solid fluidized bed would exist in the form of single discrete particles or clusters. Moreover, the hydrodynamic characteristics were impacted by the inhomogeneity of particle flow, which affected the performance of the pneumatic conveying dryer. In this paper, the flexible ribbon chain model was proposed, and the 3D flexible ribbon particle computing method with GPU was established. The dynamic behavior of the flexible ribbon particles was investigated in a pneumatic conveying dryer. Specially, the effects of particle flow rate, superficial gas velocity, and other parameters on the dynamic behavior of flexible ribbon particles were analyzed. The experimental verification was also performed by a fluidization test of cut tobacco particles. The results provide guidance for the further study of ribbon particles.

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3D Flexible Ribbon Chain Model for Simulating Dynamic Behaviors of Flexible Ribbon Particles in a Pneumatic Conveying Dryer

Huang,

Zhang,

Ding

et al. 2024

Ind. Eng. Chem. Res.

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Mechanical Behavior of Flexible Fiber Assemblies: Review and Future Perspectives

Wang,

Han,

Wang

et al. 2024

Materials

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Flexible fibers, such as biomass particles and glass fibers, are critical raw materials in the energy and composites industries. Assemblies of the fibers show strong interlocking, non-Newtonian and compressible flows, intermittent avalanches, and high energy dissipation rates due to their elongation and flexibility. Conventional mechanical theories developed for regular granular materials, such as dry sands and pharmaceutical powders, are often unsuitable for modeling flexible fibers, which exhibit more complex mechanical behaviors. This article provides a comprehensive review of the current state of research on the mechanics of flexible fiber assemblies, focusing on their behavior under compression, shear flow, and gas–fiber two-phase flow processes. Finally, the paper discusses open issues and future directions, highlighting the need for advancements in granular theories to better accommodate the unique characteristics of flexible fibers, and suggesting potential strategies for improving their handling in industrial applications.

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A numerical investigation on segregation in gas-fluidized beds of short, flexible fibers

Cited by 2 publications

References 35 publications

3D Flexible Ribbon Chain Model for Simulating Dynamic Behaviors of Flexible Ribbon Particles in a Pneumatic Conveying Dryer

3D Flexible Ribbon Chain Model for Simulating Dynamic Behaviors of Flexible Ribbon Particles in a Pneumatic Conveying Dryer

Mechanical Behavior of Flexible Fiber Assemblies: Review and Future Perspectives

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