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A method for confirming a CFD drag model of a liquid-solid fluidized bed

A fluidized bed and drag technology, applied in the field of fluidized bed multiphase flow CFD simulation, can solve the problems of time-consuming and computing resources, omission of the best model, etc.

Active Publication Date: 2019-06-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the confirmation of the drag force model in the CFD simulation of a liquid-solid fluidized bed has the following problems: the confirmation of the drag force model occupies a considerable proportion of the entire CFD verification and confirmation work, and consumes a lot of time and computing resources. The number of drag models increases greatly; on the other hand, drag models have always been one of the academic focuses of multiphase flow, and new models emerge in endlessly. However, based on limited resources, usually only 2 to 3 drag models are confirmed. work, so easily the best model is missed due to the small number of "samples"

Method used

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  • A method for confirming a CFD drag model of a liquid-solid fluidized bed
  • A method for confirming a CFD drag model of a liquid-solid fluidized bed
  • A method for confirming a CFD drag model of a liquid-solid fluidized bed

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Experimental program
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Effect test

Embodiment 1

[0085] Step 1. Given initial conditions:

[0086] Physical parameters: particle diameter d p =0.003m, particle density ρ p =2500kg / m 3 , fluid density ρ f = 1000kg / m 3 , fluid dynamic viscosity μ = 0.001Pa s; operating conditions: superficial velocity u 0 =0.07m / s; and at superficial velocity u 0 =0.07m / s, the experimentally measured particle volume concentration φ=0.44.

[0087] Step 2. Analyze the force on a single particle and establish a mechanical equation: Generally, the bed of a liquid-solid fluidized bed is approximated as a liquid-solid suspension. The liquid-solid suspension has the following two characteristics: the particles in the suspension are in a state of force balance ; The interaction between particles can be ignored; therefore, it can be considered that a single particle in a liquid-solid fluidized bed is only affected by gravity G, buoyancy F b and the drag force F exerted by the fluid d , and its equilibrium equation is:

[0088] G=F b +F d (1...

Embodiment 2

[0141] Step 1. Given initial conditions:

[0142] Physical parameters: particle diameter d p =1.13mm, particle density ρ p =2540kg / m 3 , fluid density ρ f =999.5kg / m 3 , fluid dynamic viscosity μ = 0.00124Pa s; operating conditions: superficial velocity u 0 =0.0381m / s; and at superficial velocity u 0 =0.0381m / s, the experimentally measured particle volume concentration φ=0.342.

[0143] The implementation process of steps 2-4 is the same as that of case 1, and will not be repeated here.

[0144] The following only shows the relevant calculation results of the steps: As can be seen from the table and the figure, observe e th , the relative error of the BVK drag model is the smallest, followed by the Gidaspow drag model; and the observed e CFD , then the relative error of the Gidaspow drag model is the smallest, followed by the BVK drag model; therefore, the two methods get the same conclusion, that is, the recommended drag model suitable for this system is the Gidaspow ...

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Abstract

The invention discloses a method for confirming a CFD drag model of a liquid-solid fluidized bed, and relates to the field of CFD simulation of fluidized bed multiphase flow. A mechanical equation isestablished on the basis of stress analysis of single particles in a particle swarm system, a CFD drag model expression is combined, the volume concentration of particles in a bed is obtained and compared with experimental measurement values, and finally an optimal CFD drag model suitable for physical parameters and operation conditions is determined. According to the method, CFD calculation is replaced by theoretical calculation, and on the premise that accuracy is ensured, the defect that confirmation of a drag model consumes a large amount of time and calculation resources in current liquid-solid fluidized bed CFD simulation is overcome; And meanwhile, the confirmation of a plurality of CFD drag force models is also realized.

Description

technical field [0001] The invention relates to the field of CFD (Computational Fluid Dynamics) simulation of fluidized bed multiphase flow, and discloses a method for confirming a CFD drag force model of a liquid-solid fluidized bed. Background technique [0002] Due to its good particle mixing characteristics and high heat and mass transfer efficiency, the application of liquid-solid fluidized bed covers almost the entire process industry, including chemical industry, energy, mining, environmental protection and biochemical fields. In these applications, the multiphase flow of particle fluid significantly affects the processes such as heat and mass transfer and chemical reactions in the implantation bed, and it occupies a fundamental position; therefore, a deep understanding of the fluid dynamics in the bed has great influence on the operation, Design, optimization, and scale-up play critical roles. [0003] The research on fluid dynamics in liquid-solid bed is mainly div...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张锴张仪关彦军白玉龙曲江源齐娜娜滕阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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