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Euler-Euler CFD modeling of fluidized bed:Influence of specularity coefficient on hydrodynamic behavior

Particuology 2013年第6期11卷 673-680页

作者： chanchal loha Himadri Chattopadhyay Pradip K.Chatterjee Thermal Engineering Group CSIR-Central Mechanical Engineering Research Institute Department of Mechanical Engineering Jadavpur University

Euler-Euler two-fluid model is used to simulate the hydrodynamics of gas-solid flow in a bubbling flu- idized bed with Geldert B particles where the solid property is calculated by applying the kinetic theory of granular flow （KTGF）. Johnson and Jackson wall boundary condition is used for the particle phase, and different amount of slip between particle and wall is given by varying the specularity coefficient （φ） from 0 to 1. The simulated particle velocity, granular temperature and particle volume fraction are compared to investigate the effect of different wall boundary conditions on the hydrodynamic behavior, Some of the results are also compared with the available experimental data from the literature. It was found that the model predictions are sensitive to the specularity coefficient. The hydrodynamic behavior deviated sig- nificantly for φ = 0 and φ = 0.01 with maximum deviation found at φ = 0 i.e. free-slip condition. However, the overall bed height predicted by all the conditions is similar.

关键词： Fluidized bed Hydrodynamics Specularity coefficient CFD

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Effect of coefficient of restitution in Euler-Euler CFD simulation of fluidized-bed hydrodynamics

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Particuology 2014年第4期12卷 170-177页

作者： chanchal loha Himadri Chattopadhyay Pradip K.Chatterjee Thermal Engineering Division CSIR-Central Mechanical Engineering Research InstituteDurgapur 713209India Department of Mechanical Engineering Jadavpur UniversityKolkata 700032India

Collision between particles plays an important role in determining the hydrodynamic characteristics of gas-solid flow in a fluidized bed. In the present work, earlier work （loha, Chattopadhyay, ＆ Chatterjee, 2013） was extended to study the effect of the elasticity of particle collision on the hydrodynamic behavior of a bubbling fluidized bed filled with 530-~m particles. The Eulerian-Eulerian two-fluid model was used to simulate the hydrodynamics of the bubbling fluidized bed, where the solid-phase properties were calculated by applying the kinetic theory of granular flow. To investigate the effect of the elasticity of particle collision, different values of the coefficient of restitution were applied in the simulation and their effects were studied in detail. Simulations were performed for two different solid-phase wall boundary conditions. No bubble formation was observed for perfectly elastic collision. The bubble formation started as soon as the coefficient of restitution was set below 1.0, and the space occupied by bubbles in the bed increased with a decrease in the coefficient of restitution. Simulation results were also compared with experimental data available in the literature, and good agreement was found for coefficients of restitution of 0.95 and 0.99.

关键词： Coefficient of restitution Fluidization Hydrodynamics Computational fluid dynamics Euler-Euler approach

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An overview of biomass solid fuels:Biomass sources,processing methods,and morphological and microstructural properties

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Journal of Bioresources and Bioproducts 2023年第4期8卷 333-360页

作者： Segun E.Ibitoye Rasheedat M.Mahamood Tien-Chien Jen chanchal loha Esther T.Akinlabi Department of Mechanical Engineering Science Faculty of Engineering and the Built EnvironmentUniversity of JohannesburgAuckland Park2006524South Africa Department of Mechanical Engineering Faculty of Engineering and TechnologyUniversity of IlorinIlorin P.M.B.1515Nigeria Energy Research and Technology Group CSIR-Central Mechanical Engineering Research InstituteWest BengalDurgapur-713209India Department of Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle NE18STUnited Kingdom

Biomass solid fuel(BSF)has emerged as a promising renewable energy source,but its morphological and microstructural properties are crucial in determining their physical,mechanical,and chemical *** paper provides an overview of recent research on *** focus is on biomass sources,BSF processing methods,and morphological and microstructural properties,with a special emphasis on energy-related *** inclusion and exclusion criteria were established for the study to ensure *** inclusion criteria encompassed studies about BSFs and studies investigating the influence of biomass sources and processing methods on the morphological and microstructural properties of solid fuels within the past five *** technologies for converting biomass into usable energy were discussed,including gasification,torrefaction,carbonization,hydrothermal carbonization(HTC),and *** has advantages and disadvantages in energy performance,techno-economics,and climate *** is efficient but requires high *** produces bio-oil,char,and gases based on feedstock *** generates low-cost biochar for solid fuels and carbon sequestration *** increases energy density for co-firing with *** processes wet biomass efficiently with lower energy *** treatment affects BSF durability and strength,often leading to less durability due to voids and gaps between *** carbonization alters surface morphology,creating cavities,pores,and distinctive *** pyrolysis generates biochar with better morphological properties,while fast pyrolysis yields biochar with lower porosity and surface *** constitutes 67%of the biomass sources utilized for bioenergy generation,followed by wood residues(5%),agro-residues(4%),municipal solid wastes(3%),energy crops(3%),livestock wastes(3%),and forest residues(1%).Each source has advantages and drawbacks,such as avail

关键词： Biomass feedstock Microstructural property Morphological property Renewable energy Thermal treatment

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