{"title":"Application of computational fluid dynamics for calculating the solid circulation rate in a spout-fluid bed apparatus for dry coating","authors":"Wojciech Ludwig , Viraj Santosh Pawar","doi":"10.1016/j.powtec.2025.120699","DOIUrl":null,"url":null,"abstract":"<div><div>Computational fluid dynamics was applied to determine the solid circulation rate in a modified Wurster apparatus. Simulations were performed for various particle volumes and spouting gas flowrates. To check the influence of different geometrical parameters such as the diameter of the lower draft tube, entrainment length and deflectors distance to the upper draft tube, solid circulation rates were calculated for the same. In the last stage of the simulations, novel modifications were made to the modelled apparatus wherein a particular new deflector was conceptualized in order to intensify the solid circulation rate within the apparatus. The simulations help to calculate the solid circulation rate and to visualize particle movement for different conditions and in different regions of the apparatus. This model can further help to evaluate and implement modern design changes in devices with a fast circulating dilute spouted bed.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120699"},"PeriodicalIF":4.6000,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032591025000944","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/1/25 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Computational fluid dynamics was applied to determine the solid circulation rate in a modified Wurster apparatus. Simulations were performed for various particle volumes and spouting gas flowrates. To check the influence of different geometrical parameters such as the diameter of the lower draft tube, entrainment length and deflectors distance to the upper draft tube, solid circulation rates were calculated for the same. In the last stage of the simulations, novel modifications were made to the modelled apparatus wherein a particular new deflector was conceptualized in order to intensify the solid circulation rate within the apparatus. The simulations help to calculate the solid circulation rate and to visualize particle movement for different conditions and in different regions of the apparatus. This model can further help to evaluate and implement modern design changes in devices with a fast circulating dilute spouted bed.
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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