Numerical Simulation on Characteristics of Dense-Phase Pneumatic Conveying in Horizontal Pipe

2009 ◽  
Vol 79-82 ◽  
pp. 1285-1288
Author(s):  
Zong Ming Liu ◽  
Hua Yi ◽  
Wei Lin Zhao ◽  
Xian Song Li
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Solid Phase ◽  
Fluid Model ◽  
Simulation Method ◽  
Pneumatic Conveying ◽  
Dense Phase ◽  
Horizontal Pipe ◽  
Two Fluid Model ◽  
Basic Characteristics

Numerical simulation of dense-phase pneumatic conveying flow field was carried out by using k-ε-ks-εs two-fluid model in horizontal pipe on the basis of kinetic theory of granular flow. The coupling issue between gas phase and solid phase was taken into account in the process of simulation. Such characteristics of flow field along pipe as pressure distribution, concentration distribution, gas and particle velocity distribution were obtained. The results of numerical simulation showed the tends of pressure, gas velocity, particle concentration in pipeline. The results of numerical simulation were compared with experimental results, and it showed that the simulation results were validated by the experimental data, which indicate that the model and the corresponding algorithm have higher accuracy and better prediction. Thus the numerical simulation method can reveal the basic characteristics of dense phase pneumatic conveying in horizontal pipe.

Numerical Simulation of Fluid Dynamics in a Two-Dimension Gas-Solid Bubbling Fluidized Bed

2010 ◽  
Vol 42 ◽  
pp. 466-470
Author(s):  
Tao Zeng ◽  
Xiang Zhang ◽  
Hai Bo Lin ◽  
Min Zhou ◽  
Kai Cheng
Keyword(s):  
Numerical Simulation ◽  
Fluidized Bed ◽  
Solid Phase ◽  
Fluid Model ◽  
Simulation Method ◽  
Wall Region ◽  
Flow Characterization ◽  
Bubbling Fluidized Bed ◽  
Two Fluid Model

The process of bubbles from formation to eruption was simulated by using the two-fluid model combined with the particle kinetic theory to investigate the flow characterization of gas-solid in a bubbling fluidized bed. The velocity distributions of solid-phase in different axial height were also studied. The results show that the numerical simulation method can success simulates the flow characterization of gas-solid bubbling fluidized bed. The flow characterization in bubbling fluidized bed is circulating flow structure, while the central region is upward flow and the wall region is downward flow. The simulation results agree with the experiment results.

Numerical simulation on dense phase pneumatic conveying of pulverized coal in horizontal pipe at high pressure

2010 ◽  
Vol 65 (8) ◽  
pp. 2500-2512 ◽  
Author(s):  
Wenhao Pu ◽  
Changsui Zhao ◽  
Yuanquan Xiong ◽  
Cai Liang ◽  
Xiaoping Chen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Pulverized Coal ◽  
Pneumatic Conveying ◽  
Dense Phase ◽  
Horizontal Pipe

Numerical Simulation of Dense Phase Pneumatic Conveying Gypsum in Stepped Pipeline

2011 ◽  
Vol 306-307 ◽  
pp. 1387-1392
Author(s):  
Wei Xiang Wu ◽  
Zong Ming Liu ◽  
Guang Bin Duan
Keyword(s):  
Static Pressure ◽  
Fluid Model ◽  
Dynamic Pressure ◽  
Phase Flow ◽  
Pneumatic Conveying ◽  
Dense Phase ◽  
Two Phase ◽  
Simulation Results ◽  
Two Fluid Model ◽  
Two Fluid

The process of dense phase pneumatic conveying gypsum in stepped pipeline was simulated by using an Euler-Euler two fluid model of dense gas-particle two phase flow based on the kinetic theory of gas and granular. The simulation results showed dynamic pressure increased while static pressure decreased in the first two tapered pipe, but this trend became opposite in the last diffuser pipe. The gas and particle velocity both increased in the 80-65mm and 65-50mm tapered pipe, but decreased in 50-80mm diffuser pipe. In a short, the results showed that the simulation was consistent with the fact, which proved the feasibility of our simulation.

Numerical Simulation of the Gas-Solid Flow in a Mini-Riser Reactor

2011 ◽  
Vol 396-398 ◽  
pp. 356-360
Author(s):  
Qun Shuai ◽  
Gen Lin Niu ◽  
Hui Zhao ◽  
Qiang Li
Keyword(s):  
Numerical Simulation ◽  
Kinetic Theory ◽  
Solid Phase ◽  
Fluid Model ◽  
Two Phase ◽  
Operational Conditions ◽  
Riser Reactor ◽  
Two Fluid Model ◽  
Two Fluid ◽  
As Solid Phase

The implementation of the kinetic theory for granular flows added strength to the two-phase flow model in the mini-riser. This model uses simulating and calculating commercial software of Fluent to simulate the mini-riser with 0.012m ID and 3m height. Euler-Euler two fluid model was adopted in two dimensional numerical simulation, according to kinetic theory，the solid stress was calculated based on granular temperature and granular viscosity obtained through simulation which could be used to describe the collision between particles. Simulation results, such as solid phase fraction and solid phase velocity, under different operational conditions basically agree well with the experimental measurement.

Numerical Simulation Analysis of Fluid in the Semi-State within the Desulphurization Tower

2010 ◽  
Vol 118-120 ◽  
pp. 921-924 ◽  
Author(s):  
Wei Lin Guo ◽  
Chao He
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Circulating Fluidized Bed ◽  
Simulation Analysis ◽  
Fluid Model ◽  
Simulation Design ◽  
Tower Structure ◽  
Two Fluid Model ◽  
Major Equipment ◽  
Two Fluid

In this paper, the flow field in the desulphurization tower is studied deeply based on two-fluid model, particle dynamics theory and FLUENT. A numerical simulation analysis of fluid within the desulphurization tower is done and the desulphurization tower is the major equipment in the system. The simulation design and calculations show that the two-fluid model is reasonable to analyze the flow field. The simulation results show that smoke can form good reaction environment within the desulphurization tower. It is meaningful for the further optimization of designing desulphurization tower structure in the circulating fluidized bed system.

Numerical Simulation of Gas Purification by Filtration with Ceramic Filter

2011 ◽  
Vol 356-360 ◽  
pp. 1520-1523
Author(s):  
Hai Xia Li ◽  
Zhan Xu Tie
Keyword(s):  
Numerical Simulation ◽  
Fluid Model ◽  
Simulation Method ◽  
Ceramic Filter ◽  
Phase Flow ◽  
Gas Purification ◽  
Two Phase ◽  
Ceramic Filters ◽  
Two Fluid Model ◽  
Two Fluid

The numerical simulation method is used to analyze the process of gas purification with ceramic filters. The gas /solid two-phase flow field in the ceramic filter vessel was simulated using the Eulerian two-fluid model provided by FLUENT code. The variations of the pressure distribution in the filter cavity were analyzed. The distribution of the dust cake density along the under cleaning filter length was studied.

Solid-Liquid Slurry Flow Through an Expansion in a Rectangular Duct

2013 ◽  
Author(s):  
Gianandrea Vittorio Messa ◽  
Stefano Malavasi
Keyword(s):  
Flow Field ◽  
Fluid Model ◽  
Experimental Tests ◽  
Sudden Expansion ◽  
Horizontal Pipe ◽  
Solids Concentration ◽  
Two Fluid Model ◽  
Liquid Slurry ◽  
Solid Liquid ◽  
Two Fluid

Duct flows of solid-liquid slurries are frequently encountered in many engineering applications. The literature about the behaviour of such mixtures in correspondence to hydraulic singularities — such as sudden variation of duct section, perforated plates and bar screens — is rather poor, despite they are integral part of the plants. The technical difficulties faced whilst performing experimental tests made CFD almost the only possible way to study the flow field in detail. In the present work the flow of sand-water mixtures through a sudden expansion in a rectangular horizontal duct is investigated by means of a two-fluid model. Due to the lack of experimental data available, a sensitivity analysis is performed to quantify the influence of the terms of the two-fluid model which proved negligible in the horizontal pipe case, topic of previous investigations. Computations were performed for either dilute or dense mixtures, in order to study the effect of the mean solids concentration on the flow field. Moreover, the effect of channel width is investigated to assess the validity of the hypothesis of two-dimensionality of the flow.

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