| FLUIDIZATION OF FINE POWDERS IN FLUIDIZED BEDS WITH AN UPWARD OR A DOWNWARD AIR JET |
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| 引用本文： | RuoyuHong JianminDing HongzhongLi. FLUIDIZATION OF FINE POWDERS IN FLUIDIZED BEDS WITH AN UPWARD OR A DOWNWARD AIR JET[J]. 中国颗粒学报, 2005, 3(3): 181-186 |
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| 作者姓名： | RuoyuHong JianminDing HongzhongLi |
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| 作者单位： | [1]DepartmentofChemistryandChemicalEngineering,SoochowUniversitySuzhou215006,P.Ft.China／／Multi.PhaseReactionLa,borato,~,ln~uteofPr~x~s.~Engineering.Chinese..Acadermyof,Sconces,Beijing100080,P.R.China [2]IBM,HYDN050-3C202,3605Highway52North,Rochester,MN55901,USA [3]Multi-PhaseReactionLaboratory,InstituteofProcessEngineering,ChineseAcademyofSciences，Beijing100080,P.R.China |
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| 摘 要： | The hydrodynamic behavior of fine powders in jet-fluidized beds was studied numerically and experimentally. The starting point of numerical simulation was the generalized Navier-Stokes (N-S) equations for the gas and solids phases. The K-εturbulence model was used for high-speed gas jets in fluidized beds. Computation shows that a suitable turbulence model is necessary to obtain agreement between the simulation and literature experimental data for a high-speed gas jet. The model was applied to simulating the fluidization of fine powders in fluidized beds with an upward or a downward air jet. An empirical cohesion model was obtained by correlating the cohesive force between fine particles using a cohetester. The cohesion model was embedded into the two-fluid model to simulate the fluidization of fine powders in two-dimensional (2-D) beds. To study the fluidization behavior of fine and cohesive powders with a downward jet,experiments were performed in a 2-D bed. Agreement between the computed time-averaged porosity and measured data was obtained. With an upward jet in the bed center, the measured and computed porosities show a dilute centralcore, especially at very high jet velocities. Based on our experiments and computations, a downward jet located inside the bed is recommended to achieve better mixing and contacting of gas and solids.
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| 关 键 词： | 精细粉末 流化工艺 空气射流 二相流模型 |
FLUIDIZATION OF FINE POWDERS IN FLUIDIZED BEDS WITH AN UPWARD OR A DOWNWARD AIR JET |
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| Ruoyu Hong,Jianmin Ding and Hongzhong Li. FLUIDIZATION OF FINE POWDERS IN FLUIDIZED BEDS WITH AN UPWARD OR A DOWNWARD AIR JET[J]. China Particuology, 2005, 3(3): 181-186 |
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| Authors: | Ruoyu Hong Jianmin Ding Hongzhong Li |
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| Affiliation: | Ruoyu Hong,Jianmin Ding and Hongzhong Li Department of Chemistry and Chemical Engineering,Soochow University,Suzhou 215006,P. R. China Multi-Phase Reaction Laboratory,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100080,P. R. China IBM,HYDA/050-3 C202,3605 Highway 52 North,Rochester,MN 55901,USA |
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| Abstract: | |
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| Keywords: | fluidization jet fine powder two-fluid model |
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