A universal drag model for liquid-solid fluidization: Experiment, data-driven modeling, CFD modeling and simulation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-10-02 DOI:10.1016/j.powtec.2024.120335

Guangming Zhou, Le Xie

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引用次数: 0

Abstract

Various industrial applications are performed in liquid-solid fluidized beds where drag force plays a significant role in affecting the expansion characteristics of granular-bed, and then determines the mass/heat transfer performance. This study employs dimensionless learning data-driven modeling method, which is derived from the principle of dimensional invariance, to automatically discover the relationship between the drag coefficient and hydraulic dimensionless numbers from the liquid-solid fluidization data. It is found that the Fr number (

= u_{l}^{2} / ({gd}_{s})

) also plays important role in improving the prediction accuracy of drag model except for Re number (

= d_{s} u_{l} ρ_{l} / μ_{l}

). The proposed data-driven modeling method has desired robustness, and the yielded drag model can be applicable to other liquid-solid systems, such as water-polystyrene spheres and water-coal particles, although it is derived from the fluidization of spherical glass beads in rising tap-water. The proposed drag model can also provide good CFD simulation results that agree very well with the experiment data with the relative error less than 5 %.

Abstract Image

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液固流化的通用阻力模型：实验、数据驱动建模、CFD 建模和模拟

在液固流化床的各种工业应用中，阻力对颗粒床的膨胀特性起着重要影响，进而决定传质/传热性能。本研究采用无量纲学习数据驱动建模方法，该方法源于量纲不变性原理，可从液固流化数据中自动发现阻力系数与水力无量纲数之间的关系。研究发现，除 Re 数（=dsulρl/μl）外，Fr 数（=ul2/gds）对提高阻力模型的预测精度也有重要作用。所提出的数据驱动建模方法具有理想的鲁棒性，所得到的阻力模型可适用于其他液固体系，如水-聚苯乙烯球体和水-煤颗粒，尽管它是由球形玻璃珠在上升的自来水中的流化推导出来的。所提出的阻力模型还能提供良好的 CFD 模拟结果，与实验数据非常吻合，相对误差小于 5%。

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来源期刊

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.