Effect of Pressure Drop of Distributor on Flow Pattern in 2-D Fluidized Bed: DEM Simulation and Experiment

2003 ◽  
Author(s):  
Toshihiro Kawaguchi ◽  
Yunosuke Mizushima ◽  
Toshitsugu Tanaka ◽  
Yutaka Tsuji
Keyword(s):  
Pressure Drop ◽  
Discrete Element Method ◽  
Flow Pattern ◽  
Fluidized Bed ◽  
Particle Motion ◽  
Fluidized Beds ◽  
Gas Flows ◽  
Dem Simulation ◽  
Effect Of Pressure ◽  
Simulation And Experiment

In the present study, effects of pressure drop across a distributor on particle motion in fluidized beds are studied numerically and empirically. The discrete element method (DEM) is employed to calculate the motion of individual particle. The predicted pressure drop across the distributor required to achieve uniform gas flows agreed well with previous empirical findings.

CFD-DEM simulation of flow pattern and particle velocity in a fluidized bed with wet particles

2017 ◽  
Vol 314 ◽  
pp. 346-354 ◽  
Author(s):  
Chengxiao Song ◽  
Daoyin Liu ◽  
Jiliang Ma ◽  
Xiaoping Chen
Keyword(s):  
Flow Pattern ◽  
Fluidized Bed ◽  
Particle Velocity ◽  
Dem Simulation ◽  
Wet Particles

Numerical Simulation on Thermal Field in the Fluidized Bed with Internal Heating Plates

2013 ◽  
Vol 690-693 ◽  
pp. 3162-3165
Author(s):  
Ji Hai Duan ◽  
Qi Wang
Keyword(s):  
Numerical Simulation ◽  
Pressure Drop ◽  
Fluidized Bed ◽  
Fluidized Beds ◽  
Thermal Field ◽  
Side Reactions ◽  
Internal Heating ◽  
New Type ◽  
Over Time

Fluidized beds are widely used in the factories. However, the traditional heating methods can not meet the actual needs. Then we propose a new type fluidized-bed, which can effectively resolve the problem occurred in conventional fluidized-bed. The temperature of the reaction gas can be distributed uniformly in the new type fluidized-bed, the bed pressure drop is relatively stable over time. The above situations are conducive to the reactions stability, and reduce the occurrence of side reactions as well.

Prediction of the Flotsam Component in a Gas-Fluidized Bed of Two Dissimilar Solids

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Alberto Di Renzo ◽  
Francesco P. Di Maio ◽  
Vincenzino Vivacqua
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Computational Fluid Dynamics ◽  
Simple Model ◽  
Discrete Element Method ◽  
Fluidized Bed ◽  
Fluidized Beds ◽  
Computational Simulations ◽  
The Difference ◽  
Gas Fluidized Beds

In the present paper the segregating behaviour of solids of different size and density in gas-fluidized beds is studied. In particular, the attention is focussed on pairs composed of a bigger/less dense species and a smaller/denser species. Typical industrial examples of such combinations are encountered in fluidized beds of biomass/sand mixtures. Their behaviour is not easily predictable, as the segregation tendency promoted by the difference in density is counteracted by the difference in size. While typically the denser component is expected to appear predominantly at the bottom of the fluidized bed, experiments on mixtures exhibiting the reverse behaviour have been reported (e.g. Chiba et al., 1980).A simple model to predict the segregation direction of the components, i.e. which species will segregate to the top of the bed (the flotsam), depending upon their difference in properties (size, density) and the mixture composition, is discussed. The predicted behaviour is compared with experimental data available in the literature and agreement is found for the majority of them. For one mixture, experiments are conducted as well as computational simulations based on the combined Discrete Element Method and Computational Fluid Dynamics (DEM-CFD) approach. This allows investigating how an initially mixed bed upon suspension evolves as a result of the segregation prevalence in the bed.

CFD Simulation Research on Flow Characteristics of Fluidized Beds

2014 ◽  
Vol 881-883 ◽  
pp. 1809-1813
Author(s):  
Li Ning Han ◽  
Lu Min Wang
Keyword(s):  
Particle Size ◽  
Pressure Drop ◽  
Fluidized Bed ◽  
Fluidized Beds ◽  
Particle Distribution ◽  
Cfd Simulation ◽  
Fluid Model ◽  
Flow Characteristics ◽  
Fluidization Velocity ◽  
Motion Characteristics

The Euler-Euler two-fluid model incorporating the kinetic theory of granular flow was applied to simulate the gas-solid flow in fluidized beds. The pressure drop, particle distribution and motion characteristics were studied in this paper. In order to investigate the effect of structure of the fluidized bed on flow characteristics, fluidized beds with different diameters and structures were applied. User defined functions (UDF) were applied to study the flow characteristics when the particle size and mass changed over time. The results showed that with the increase of particle size, higher minimum fluidization velocity was required, but lower pressure drop was obtained. For a certain fluidizing medium, the bed critical fluidization velocity depended only on the size and nature of the particles. The structure of a fluidized bed had an influence on the particle distribution and motion characteristics.

Fluidization of Geldart Type-D Particles in a Swirling Fluidized Bed

2011 ◽  
Vol 110-116 ◽  
pp. 3720-3727 ◽  
Author(s):  
Mohd Faizal Mohideen ◽  
Suzairin Md Seri ◽  
Vijay Raj Raghavan
Keyword(s):  
Particle Size ◽  
Pressure Drop ◽  
Fluidized Bed ◽  
Fluidized Beds ◽  
Superficial Velocity ◽  
Minimum Fluidization Velocity ◽  
Fluidization Velocity ◽  
Type D ◽  
Minimum Fluidization ◽  
Bed Material

Geldart Type-D particles are often associated with poor fluidization characteristics due to their large sizes and higher densities. This paper reports the hydrodynamics of various Geldart Type-D particles when fluidized in a swirling fluidized bed (SFB). Four different sizes of particles ranging from 3.85 mm to 9.84 mm with respective densities ranging from 840 kg/m3 to 1200 kg/m3 were used as bed material to study the effect of various bed weights (500 gram to 2000 gram) and centre bodies (cone and cylinder) for superficial velocities up to 6 m/s. The performance of the SFB was assessed in terms of pressure drop values, minimum fluidization velocity, Umf and fluidization quality by physical observation on regimes of operation. The swirling fluidized bed showed excellent capability in fluidizing Geldart Type-D particles in contrast to the conventional fluidized beds. The bed pressure drop of increased with superficial velocity after minimum fluidization as a result of increasing centrifugal bed weight. It was also found that the particle size and centre body strongly influence the bed hydrodynamics.

Flow pattern transition characteristics in vibrated gas-solid fluidized bed of Geldart B magnetite powder using pressure drop signals analysis

2018 ◽  
Vol 327 ◽  
pp. 358-367 ◽  
Author(s):  
Yadong Zhang ◽  
Yuemin Zhao ◽  
Liang Dong ◽  
Chenlong Duan ◽  
Enhui Zhou ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Flow Pattern ◽  
Fluidized Bed ◽  
Flow Pattern Transition

scholarly journals Effects of pressure drop of distributor on particle motion in fluidized bed : Comparison of DEM analysis and experiment

2003 ◽  
Vol 2003.78 (0) ◽  
pp. _14-37_-_14-38_
Author(s):  
Yunosuke MIZUSHIMA ◽  
Toshihiro KAWAGUCHI ◽  
Toshitsugu TANAKA ◽  
Yutaka TSUJI
Keyword(s):  
Pressure Drop ◽  
Fluidized Bed ◽  
Particle Motion ◽  
Dem Analysis

Comparative Study of the Hydrodynamic Performance of Shorter and Longer Blades in a Swirling Fluidized Bed

2013 ◽  
Vol 772 ◽  
pp. 560-565 ◽  
Author(s):  
Vinod Kumar Venkiteswaran ◽  
Shaharin Anwar Sulaiman ◽  
Vijay R. Raghavan
Keyword(s):  
Pressure Drop ◽  
Comparative Study ◽  
Fluidized Bed ◽  
Fluidized Beds ◽  
Hydrodynamic Performance ◽  
Industrial Processes ◽  
Blade Length ◽  
Bed Height ◽  
Current Systems

Fluidized beds have been widely used in industrial processes. The inefficiency of current systems provides opportunities for improvement and development of new fluidized bed techniques. The swirling fluidized bed is an outcome of such a quest. The main shortcomings of present day SFB systems are the underutilization of available annular area and massing of bed particles at the periphery of the bed column. In this work the authors report the effect of increasing the annular area in a Swirling Fluidized Bed (SFB) by using longer blades for the distributor and compare it to the conventional blade length of 50 mm. Distributor blades of two different lengths, 50 mm and 100 mm, was used in this work and the bed height was measured with spherical bed particle of three different sizes (4 mm, 5 mm, 6 mm) at varying bed weight and superficial velocity. For a given bed weight, the benefits are achieved through a lower bed pressure drop as well as better quality of fluidization.

Monitoring of the fluidized bed particle drying process by temperature and pressure drop measurements

2021 ◽  
pp. 1-13
Author(s):  
Gabriela Saldanha Soares ◽  
Scarlet Neves Tuchtenhagen ◽  
Luiz Antonio de Almeida Pinto ◽  
Carlos Alberto Severo Felipe
Keyword(s):  
Pressure Drop ◽  
Fluidized Bed ◽  
Drying Process ◽  
Temperature And Pressure

Modeling a Fluidized Bed Dryer through Computational Fluid Dynamics and Discrete Element Method

2021 ◽  
Author(s):  
Sebastian Alexander Pérez Cortés ◽  
Yerko Rafael Aguilera Carvajal ◽  
Juan Pablo Vargas Norambuena ◽  
Javier Antonio Norambuena Vásquez ◽  
Juan Andrés Jarufe Troncoso ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Discrete Element Method ◽  
Fluidized Bed ◽  
Discrete Element ◽  
Fluidized Bed Dryer ◽  
Element Method
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