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A presentation on the hydrodynamic modeling of circulating fluidized bed

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  1. Introduction
  2. Objectives
  3. Procedure
  4. Radial solids flux variations
  5. Results and discussions
  6. Modeling aspects
  7. Calculation of entrainment flux

Fluidization is an operation through which fine granular solids are transformed into a fluid like state through contact with a gas or liquid. An increase in the gas velocity through a granular solid brings about changes in the mode of gas solid contact in many ways. Among the several flow regimes of fluidization, bubbling fluidization is most popular. Another is high velocity fluidization, which includes both turbulent and fast fluidization. When the gas velocity of bubbling bed is increased, a turbulent bed emerges. Further increase of gas velocity results in nothing being retained in the bed, but if solid particles are continuously fed into, bed density can be controlled by solid feed rate. A bed of this nature is called ?Circulating Fluidized Bed (CFB)? because a high velocity gas is used to circulate an appropriate quantity of solids particles in this operation.

[...] A presentation on the hydrodynamic modeling of circulating fluidized bed Contents 1. Introduction 2. Literature Review 3. Experimental aspects 4. Results & Discussions 5. Modeling Aspects 6. Conclusions INTRODUCTION Fluidization is an operation through which fine granular solids are transformed into a fluid like state through contact with a gas or liquid. An increase in the gas velocity through a granular solid brings about changes in the mode of gas solid contact in many ways. Among the several flow regimes of fluidization, bubbling fluidization is most popular. [...]


[...] Several readings have been taken at different radial and axial positions of the riser by varying the gas velocity and solids circulation rate. The schematic diagram of the probe is shown in Fig Figure 3.2 : Schematic diagram of the U-tube probe used for collecting samples Results & Discussions Modeling Aspects The random particle motion phenomena in a fluidized bed is similar to the ecological diffusion process in which motion is from high particle concentration to lower concentration. Combining Brownian movement model and random walk theory with particle motion in a fast-fluidized bed. [...]


[...] The schematic diagram of the probe is shown in Fig Figure 3.2 : Schematic diagram of the U-tube probe used for collecting samples Results & Discussions Modeling Aspects The random particle motion phenomena in a fluidized bed is similar to the ecological diffusion process in which motion is from high particle concentration to lower concentration. Combining Brownian movement model and random walk theory with particle motion in a fast-fluidized bed. We have the corresponding second law of diffusion equation in which the voidage is concerned with Where denotes voidage and the two terms on the right hand side represent momentum and diffusion fluxes, respectively. [...]

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