Optimization on the Structure of Ceramic Nozzles by FLUENT Simulation

2013 ◽  
Vol 397-400 ◽  
pp. 213-217
Author(s):  
Ming Wei Ding ◽  
Chang Jing Fu ◽  
Si Bei Yin
Keyword(s):  
Cone Angle ◽  
Two Phase ◽  
Abrasive Particles ◽  
Outflow Velocity ◽  
Fluent Simulation ◽  
Fluent Software ◽  
Simulation Results ◽  
Through Hole ◽  
Hole Structure ◽  
Good Agreement

Based on the theory of gas-solid two-phase flow, abrasive flows in ceramic nozzles with different structures are simulated by FLUENT software and the outflow velocity of particles is compared. The results show: the abrasive outflow velocity of ceramic nozzle with cone angle is large than that of ceramic nozzle with through-hole structure, and the distribution of abrasive particles is more uniform for the ceramic nozzle with cone angle. The best entrance cone angle of ceramic nozzle is 10o30o, and the maximum abrasive outflow velocity of the ceramic nozzle with cone angle of 20o is 90.16 m/s. The simulation results have a good agreement with the experimental results.

Expressions for the effective diffusivity in materials with interphase boundaries

2004 ◽  
Vol 819 ◽  
Author(s):  
Irina V. Belova ◽  
Graeme E. Murch
Keyword(s):  
Polycrystalline Material ◽  
Effective Diffusivity ◽  
Poor Agreement ◽  
Two Phase ◽  
Interphase Boundaries ◽  
Long Time ◽  
Simulation Results ◽  
The Individual ◽  
Individual Grains ◽  
Good Agreement

AbstractWe address the problem of calculating the long-time-limit effective diffusivity in stable two- phase polycrystalline material. A phenomenological model is used where the high diffusivity interphase boundaries are treated as connected “coatings” of the individual grains. Derivation of expressions for the effective diffusivity with segregation is made along Maxwell lines. Monte Carlo simulation using lattice-based random walks is used to test the validity of the expressions. It is shown that for the case analysed the derived expressions for the effective diffusivity are in very good agreement with simulation results. The equivalent of the Hart equation is also derived. It is shown to be in poor agreement with simulation results.

Improved Design of Thermal Airflow Process for the Annular Cooler and Fluent Simulation

2010 ◽  
Vol 43 ◽  
pp. 351-356
Author(s):  
Xi Liang Zhang ◽  
Wen Xiang Gao ◽  
Li Qiang Chen ◽  
Jun Xu ◽  
Ai Xin Feng
Keyword(s):  
Heat Transfer ◽  
Low Temperature ◽  
Heat Recovery ◽  
Cooling Zone ◽  
Recovery Efficiency ◽  
Gas Emission ◽  
Fluent Simulation ◽  
Fluent Software ◽  
Simulation Results ◽  
Improved Design

Considering the current problems of low temperature of recovered gas, the direct gas emission of the fourth cooling zone in the operation of the annular cooler, thermal airflow process for the annular cooler is improved by analyzing the thermal airflow process and the structure of the annular cooler and using the principle of repeated convective heat transfer. Thus the above-mentioned problem can be solved. Simulation model of its thermal airflow process is established and the simulation results, obtained by using Fluent software, are as follows: the temperature of the gas in the first cooling zone entering the rotary kiln of the improved is about 110°C higher than that of the unimproved, the temperature of the gas in the second cooling zone entering the preheat zone I of the chain grate of the improved is about 150°C higher than that of the unimproved, and the temperature of the gas in the fourth cooling zone entering the downdraft drying zone of the chain grate of the improved is about 50°C higher than that of the unimproved. Pellet heat recovery efficiency is increased significantly.

Numerical Study of Interior Trajectory of Missile Ejection Based on Mechanics

2012 ◽  
Vol 485 ◽  
pp. 616-619 ◽  
Author(s):  
Yong Quan Liu ◽  
An Min Xi ◽  
Hong Fei Liu
Keyword(s):  
Flow Field ◽  
Test Data ◽  
Numerical Study ◽  
Phase Problem ◽  
Source Terms ◽  
Two Phase ◽  
Trajectory Simulation ◽  
Fluid Equations ◽  
Fluent Software ◽  
Good Agreement

An interior trajectory simulation of the gas-steam missile ejection has been developed with the help of FLUENT software. One of the special features of this simulation is the method by which the coupled two-phase problem is reduced to solving the fluid equations only. The calculation has been done efficiently in FLUENT after setting all the required parameters and adding the source terms. Several figures of the velocity and pressure have been given to show the flow field in the reservoir. The distribution curves of the velocity and acceleration of the missile show that the results of the simulation are in good agreement with the test data of the experiments. This model can be used to analyze the similar launch procedures in practice.

The Simulation of the Launching Process on Concentration Water Injection Launcher

2013 ◽  
Vol 419 ◽  
pp. 186-191
Author(s):  
Xiao Fei Zhou ◽  
Yi Jiang ◽  
Yu Sen Niu ◽  
Shao Zhen Yu
Keyword(s):  
Flow Field ◽  
Water Injection ◽  
Calculation Model ◽  
Two Phase ◽  
Average Temperature ◽  
Fluent Software ◽  
Simulation Results ◽  
Temperature And Pressure ◽  
Gas Liquid Flow ◽  
New Research

Simulation of the launching process in concentration water injection launcher, and get the parameter variations during the launch process, compared with traditional engineering algorithm, verify the reliability of the simulation results, given a new research method of interior ballistics on this launch system. This simulation has very important meaning for the temperature and pressure checking at the Beginning of the design. The simulation results show that,after the flow field stable,the average temperature and pressure in low-pressure chamber and the sabot are very close. This article uses the FLUENT software, use Mixture two-phase flow calculation model to solve the gas-liquid flow field, use the dynamic mesh and UDF program to simulation the flow field.

scholarly journals Hydraulic Transients Induced by Pigging Operation in Pipeline with a Long Slope

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Tao Deng ◽  
Jing Gong ◽  
Haihao Wu ◽  
Yu Zhang ◽  
Siqi Zhang ◽  
...  
Keyword(s):  
Field Data ◽  
Water Pressure ◽  
Severe Damage ◽  
Cavitation Model ◽  
Two Phase ◽  
Vapor Cavity ◽  
The Third ◽  
Simulation Results ◽  
Water Pressure Testing ◽  
Good Agreement

Pigging in pipelines basically performs operations for five reasons including cleaning the pipe interior, batching or separating dissimilar products, displacement, measurement, and internal inspection. A model has been proposed for the dynamic simulation of the pigging process after water pressure testing in a long slope pipeline. In this study, an attempt has been made to analyze two serious accidents during pigging operation in 2010 by the model which is developed by the method of characteristic (MOC) by Wylie et al. (1993) and the two-phase homogeneous equilibrium vaporous cavitation model deveoped by Shu (2003) for vaporous cavitation. Moreover, simulation results of the third operation show good agreement with field data from the previous field trial. After investigation, it was showed that the impulse pressures produced during collapse of a vapor cavity result in severe damage of tubes.

2D Simulation of the Gas-Solid Two Phase Flow inside the Abrasive Jet (AJ) Nozzle

2008 ◽  
Vol 53-54 ◽  
pp. 369-373
Author(s):  
Rong Guo Hou ◽  
Chuan Zhen Huang ◽  
Y.S. Feng ◽  
Y.Y. Liu
Keyword(s):  
Flow Field ◽  
Two Phase Flow ◽  
Cone Angle ◽  
Multiphase Model ◽  
Phase Flow ◽  
Fatigue Wear ◽  
Two Phase ◽  
2D Simulation ◽  
Jet Nozzle ◽  
Simulation Results

The simulation of the gas-solid two phase flow inside the abrasive jet nozzle is studied by the computed dynamic software (CFD)-FLUENT, the velocity field of the two phase flow and the trajectory of the abrasive inside the nozzle are obtained. The Eulerian multiphase model and the DPM model have been used to compute the two-phase flow field. The simulation results express that the velocity of the jet is slow at the inlet, while it will be increased with the area of the section decreasing, the cone angle of the nozzle affects the flow field very much, the flow has low turbulence and the gradient of the velocity is small when the cone angle is small, while the velocity of the flow increased rapidly and the gradient of the velocity is big when the cone angle increasing. The simulation results also express that the arc radius affects the flow field greatly, the flow will move more smoothly when the arc radius is large. The pressure field of the wall expresses that the nozzle will wear rapidly at the corner of the nozzle, the reason is that the pressure is big or changed greatly, the fatigue wear and the blast wear will happen at those place.

Numerical Investigations on the Explosion Effects of Fuel Air Mixtures

2002 ◽  
Author(s):  
Tian Zhou ◽  
Yonghui Guo ◽  
Haibo Zhang
Keyword(s):  
Gas Phase ◽  
Fuel Droplet ◽  
Tvd Schemes ◽  
Propagation Process ◽  
Two Phase ◽  
Fuel Gas ◽  
Reaction Velocity ◽  
Numerical Investigations ◽  
Simulation Results ◽  
Good Agreement

To investigate the explosion parameters of Fuel Air Mixtures, the two-phase gas-droplet conservation equations are used. The model includes the following aspects: the deformation and fragmentation of the fuel droplet, the formation of fuel gas through evaporation and stripping of the boundary layer of the fuel droplet, the chemical delay and chemical reaction velocity between fuel gas and oxygen in the air. The high-resolution implicit TVD schemes are applied to gas phase equations and MacCormack schemes to liquid phase equations. The formation and propagation process of gas-droplet detonation wave inside the fuel air cloud and the attenuation process of the shock wave outside the cloud are simulated numerically. The simulation results keep good agreement with others’ study. The explosion effects of the height of the second ignition inside the cloud and the ratio of the cloud height to the cloud diameter are investigated numerically, too.

Study and Prevention on the Diffusion Rule of Dust Pollution in the Coal Mine Whole-Rock Fully Mechanized Workface

2012 ◽  
Vol 246-247 ◽  
pp. 608-613 ◽  
Author(s):  
Wei Min Cheng ◽  
Wen Nie ◽  
Gang Pan ◽  
Sen Cao ◽  
Xin Hua Zhang
Keyword(s):  
Dust Particles ◽  
Phase Flow ◽  
Kp Equation ◽  
Dust Pollution ◽  
Two Phase ◽  
Measuring Point ◽  
Measurement Results ◽  
Fluent Software ◽  
Simulation Results ◽  
The Mathematical Model

The mathematical model of solving two-phase flow of gas and dust particles was built by established the k-ε-Θ-kp equation. Moreover, by using FLUENT software, the diffusion rule of dust pollution in the whole-rock fully mechanized workface was researched with different air-draft amount. The result showed that when the air-draft amount increased from 320m3/min to 600m3/min, de-dust ability of extraction fan drum is gathering strength, pervasion intensity of producing dust is continuously decreased in tunneling place. The simulation results of each measuring point are basically consistent with the field measurement results.

Modeling of Two-Phase Boiling Flow and Critical Heat Flux With the NEK-2P CFD Code

2017 ◽  
Author(s):  
Adrian Tentner ◽  
Prasad Vegendla ◽  
Ananias Tomboulides ◽  
Aleks Obabko ◽  
Elia Merzari ◽  
...  
Keyword(s):  
Heat Flux ◽  
Wall Temperature ◽  
Measured Data ◽  
Two Phase ◽  
Initial Validation ◽  
Hydraulic Conditions ◽  
Boiling Flow ◽  
Simulation Results ◽  
Two Fluid ◽  
Good Agreement

The paper focuses on the development, implementation, and initial validation of the NEK-2P two-fluid two-phase model. Recent extensions of the Extended Boiling Framework (EBF) models are presented, including the implementation of a four-field two-phase topology which replaces the previous two-field two-phase approach. The paper presents results of recent NEK-2P analyses of several CHF experiments. Good agreement between the simulated wall temperatures and measured data is observed. The simulation results predict well both the dryout location and post dryout wall temperature magnitudes, illustrating the ability of the NEK-2P code and extended EBF models to simulate the CHF phenomena for a range of thermal-hydraulic conditions.

scholarly journals Simulation and experimental study of novel cascade solar still

2021 ◽  
Vol 297 ◽  
pp. 01002
Author(s):  
Nidal Mouhsin ◽  
Mariam Bouzaid ◽  
Mourad Taha-Janan ◽  
Mohamed Oubrek
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Solar Still ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Climate Conditions ◽  
Fluent Software ◽  
Simulation Results ◽  
Good Agreement

In this paper, a new design of inclined solar still with steppe absorber plate, slope surfaces and baffles were proposed, fabricated, tested and modeled using ANSYS FLUENT software, in order to develop the simple and the cheapest type of desalination. The simulation has been carried out and validated with experimental data for climate conditions of Rabat-Morocco (34°47’N) obtained from our existing prototype. It has been found that the simulation results are in good agreement with the experimental data. It was also examined that the productivity of the cascade Solar Still was higher from 12:00 to 15:00 hrs. The results indicate that the new design ensures higher productivity.

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