Numerical study on effects of granular deformations on dense powder conveying using a modified two-fluid model

IF 4.6 2区 工程技术 Q2 ENGINEERING, CHEMICAL
Shilin Gao, Zaiyin Ma, Haibin Zhang, Bofeng Bai
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引用次数: 0

Abstract

Granular deformations exert significant effects on conveying dynamics, coupled with inherent multiscale nonlinearity and complex rheological characteristics of dense powder flows, necessitating further in-depth investigations to unveil dense powder conveying mechanisms. Based on the coupling of the multiple-state theory, granular deformations have been introduced into the modified two-fluid model (TFM) through the refinement of the mesoscopic solid-pressure model in this study. To validate the modified TFM, a dense powder conveying experiment featuring a built-in fluidization gas intake structure was conducted, in which the instability of startup behaviors, directly affecting the optimization of conveying strategies, have been preliminarily identified. Moreover, a comparative analysis with multiple experimental results demonstrates the accuracy and reliability of the developed numerical model, highlighting the necessity of accounting for granular deformations. Using the modified TFM, the startup behaviors of dense powder conveying were thoroughly analyzed, revealing effects of granular deformations on increasing peak powder flow rates and the solid-gas ratio, indicating the non-ideal linearity of powder flow rate and fluidization pressure, and illustrating the decompression process within the powder layer. Additionally, inhomogeneous local solid-pressure concentrations within the powder flow resulting from the internal structures and fluidizing gas, and their impacts on conveying dynamics were captured in the simulations. The findings could provide valuable insights into the details of dense powder conveying and present a novel numerical approach, contributing significantly to the design and optimization of granular systems.

Abstract Image

基于改进双流体模型的颗粒变形对致密粉体输送影响的数值研究
颗粒变形对输送动力学影响显著,加之致密粉体流动固有的多尺度非线性和复杂流变特性,需要进一步深入研究以揭示致密粉体的输送机理。本研究基于多态耦合理论,通过对介观固压模型的细化,将颗粒变形引入修正的双流体模型。为了验证改进后的TFM,进行了内置流化进气结构的密粉输送实验,初步确定了启动行为的不稳定性,直接影响输送策略的优化。通过与多个试验结果的对比分析,验证了所建立的数值模型的准确性和可靠性,突出了考虑颗粒变形的必要性。利用改进的TFM,深入分析了密粉输送的启动行为,揭示了颗粒变形对粉末峰值流量和固气比增加的影响,表明了粉末流量和流化压力的非理想线性关系,并说明了粉末层内的减压过程。此外,模拟中还捕获了由内部结构和流化气体引起的粉末流动中的局部固体压力浓度不均匀及其对输送动力学的影响。这些发现可以为致密粉末输送的细节提供有价值的见解,并提出了一种新的数值方法,对颗粒系统的设计和优化有重要贡献。
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来源期刊
Powder Technology
Powder Technology 工程技术-工程:化工
CiteScore
9.90
自引率
15.40%
发文量
1047
审稿时长
46 days
期刊介绍: Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.
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