Numerical modeling of gas-liquid-solid fluidized bed using VOF-DEM approach: Optimization and validation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2024-09-05 DOI:10.1016/j.powtec.2024.120247

引用次数: 0

Abstract

To investigate the flow characteristics in gas-liquid-solid fluidized bed, an optimized volume of fluid (VOF) and discrete element method (DEM) combined multiscale solver is implemented. The gas-liquid interface is captured by VOF with a sharpening algorithm, while particles are tracked using DEM. The particle volume fraction is calculated by a divided volume-averaging technique and several well-established drag closures are incorporated for gas-liquid-solid three-phase coupling. The solver is first adopted in a particle water-entry process to validate the volume conservation of the VOF-DEM method. Then the solver is separately utilized in liquid-solid and gas-solid systems for a detailed verification of liquid-solid and gas-solid interactions. The results show that the van der Hoef drag closure is the most appropriate for both liquid-solid and gas-solid interactions among the investigated drag closures. Using van der Hoef drag closure, the flow characteristics in a mini gas-liquid-solid fluidized bed are investigated, identifying different flow patterns.

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使用 VOF-DEM 方法对气-液-固流化床进行数值建模：优化与验证

为了研究气-液-固流化床中的流动特性，采用了优化的流体体积法（VOF）和离散元法（DEM）相结合的多尺度求解器。采用锐化算法的 VOF 捕获气液界面，同时使用 DEM 跟踪颗粒。粒子的体积分数是通过分割体积平均技术计算得出的，并结合了几种成熟的阻力闭合方法，用于气-液-固三相耦合。该求解器首先用于颗粒进水过程，以验证 VOF-DEM 方法的体积守恒性。然后分别在液固和气固系统中使用该求解器，详细验证了液固和气固的相互作用。结果表明，在所研究的阻力闭包中，范德霍夫阻力闭包最适合液固和气固相互作用。利用范德霍夫阻力闭合，研究了微型气-液-固流化床中的流动特性，确定了不同的流动模式。

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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.