Selection of Relative DEM Time Step for Modelling Fast Fluidized Bed of A-Type FCC Particles
نویسندگان
چکیده
In chemical production processes, the most suitable operation regime for A-Type powders such as typical FCC particles is high-speed fast fluidization owing to their uniquely advantageous properties. Discrete element method (DEM) modelling with has rarely been reported. How appropriately select DEM time step and stiffness coefficient one of critical problems stable accurate calculation. This article mainly discusses effect on simulations A-type particles. order describe both parameters complex interaction, a dimensionless relative introduced. total, nine cases different numbers steps are adopted microfluidized bed particles, which proved be fluidization. Results show that three bifurcations occur in all simulations. Only moderate possesses capability process particle collision thus predicts right flow asymmetric heterogeneous fluidized structures. When increases large rank, predict untrue regimes symmetric homogeneous Moreover, over-large over-low cause excessive overlap divergence simulation. The further optimization relation real property unidentifiable an outstanding issue. That range limited indicates common soft-sphere model poor at It suggested possible future work should focused improving simulation frame employing molecular dynamics more deal contact.
منابع مشابه
Hydrodynamic Behavior of Particles in a Jet Flow of a Gas Fluidized Bed
Numerous investigations have been devoted towards understanding the hydrodynamics of gas jets in fluidized beds. However, most of them address the problem from macroscopic point of view, which does not reveal the true behavior in the jet region at the single particle level. The present work aims to understand the jet behavior from a more fundamental level, i.e. the individual particle leve...
متن کاملControl of a Fluidized Bed Polyethylene Reactor
In present paper, dynamic behavior and control of a fluidized bed reactor for polyethylene production has been considered. A double active sites model for Ziegler-Natta catalysts is used for simulation of polymerization reaction. Hydrodynamic behavior of the bed is modeled using a two phase model including bubble and emulsion phases in which bubble phase has plug flow pattern with different...
متن کاملthe investigation of the relationship between type a and type b personalities and quality of translation
چکیده ندارد.
a time-series analysis of the demand for life insurance in iran
با توجه به تجزیه و تحلیل داده ها ما دریافتیم که سطح درامد و تعداد نمایندگیها باتقاضای بیمه عمر رابطه مستقیم دارند و نرخ بهره و بار تکفل با تقاضای بیمه عمر رابطه عکس دارند
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symmetry
سال: 2023
ISSN: ['0865-4824', '2226-1877']
DOI: https://doi.org/10.3390/sym15020488