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CFD Model of Dense Gas-solid Systems in Jetting Fluidized Beds
作者姓名:Kai Zhang **  Jiyu Zhang and Biiang ZhangInstitute of Coal Chemistry  Chinese Academy of Sciences  P.O. Box  Taiyuan  P. R.ChinaJohn Yates
作者单位:Kai Zhang **,Jiyu Zhang and Biiang ZhangInstitute of Coal Chemistry,Chinese Academy of Sciences,P.O. Box 165,Taiyuan 030001,P. R.ChinaJohn YatesDepartment of Chemical Engineering,University College London,London,WC1E 7JE,UK
基金项目:SupportedbyNationalNaturalScienceFoundationofChina(No .2 94 76 2 6 2 )andRoyalSocietyofLondon .
摘    要:IntroductionAsmodificationofgas solidfluidizedbeds ,jet tingfluidizedbedsarewidelyusedinavarietyofphysicalandchemicalprocessesbecauseoftheirgoodmixingcharacteristics ,highheatandmasstransferrates ,andfastchemicalreaction .However ,thelackofcompleteundersta…


CFD Model of Dense Gas-solid Systems in Jetting Fl uidized Beds
Kai Zhang **,Jiyu Zhang and Biiang ZhangInstitute of Coal Chemistry,Chinese Academy of Sciences,P.O. Box ,Taiyuan ,P. R.ChinaJohn Yates.CFD Model of Dense Gas-solid Systems in Jetting Fluidized Beds[J].Chemical Research in Chinese University,2002,18(2).
Authors:Kai Zhang  Jiyu Zhang  Biiang Zhang
Abstract:A CFD code has been developed based on the conservation principles describing gas and solid flow in fluidized beds. This code is employed to simulate not only the spatiotemporal gas and solid phase velocities and voidage profiles in a two dimensional bed but also fluid dynamics in the jet region. The computational results show that gas flow direction is upward in the entire bed accompanied with random local circulations, whilst solid flow direction is upward at the center and downward near the wall. The radical reason of strong back mixing of solid particles and good transfer behavior between two phases is that the jet entrains solid particles. Numerical calculation indicates that gas velocity, solid velocity and pressure profile have a significant change when the voidage is 0 8. The simulated time averaged voidage profiles agree with the experimental results and simulated data reported by Gidaspow and Ettehadieh(1983). Therefore, CFD model can be regarded as a useful tool to study the jet characteristics in dense gas solid fluidized beds.
Keywords:Jetting fluidized bed  CFD model  Gas  solid dynamics  Modified SIMPLE
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