جۆری توێژینه‌وه‌: Original Article

نوسه‌ر

Sulaimani Polytechnic University (SPU), Al- Sulaimaniyah, Kurdistan Region, Iraq

پوخته‌

This study focuses on analyzing and modeling the interactions between fluid and solid
particles. A model based on the detection of contacts in granular medium is developed
from a Discrete Elements approach (DEM) for solid phase, coupled with a
Computational Fluid Dynamics (CFD) for fluid phase. The objective of this work is to
investigate the interactions occurs between the fluid and solid particles in fluidized beds,
and to better understand the various characteristic of these interactions which is the base
of work of unit operations in a set of industrial processes. A comparison between
different models of fluid flow (laminar model, k- model, and k-ω SST model) in CFD
code is showed that; the k- model is most appropriate for calculation of fluid flow in
industrial applications. The interaction between the fluid and each particle is performed
through a drag force. The effect of the local particle concentration on the drag force is
modeled by a porosity function. The simulations results are revealed that the value of
exponent of porosity shows substantial dependence on the size of the Representative
Volume Element (REV), tortuosity and the velocity of the fluid flow. Finally, the
comparison between numerical simulation results with experimental results, in terms of
fluidized bed height are showed that the bed expansion height of the fluidized bed is
increased with an increase of fluid velocity, and this presents already a very good fit,
which eventually achieve an optimization of fluidization processes.

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