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CFD simulation of the liquid-column flow field of double contact Lijun Fang1, a, Yanchao Chang2,b 11School of Energy Power and Mechanical Engineering,North China Electric Power University, Baoding 071003,China afanglijun2009@163.com, bchangyanchao12345@163.com Key words: double contact ; liauid-column tower; flow field; pressure drop.
Through the numerical simulation of the particular condition, gas flow condition was described in conditions of different nozzle number and different liquid air ratio.
Guo Ruitang[1] went on numerical simulation of flow distribution in the wet FGD impinge liquid-tower and the SO2 absorption, using CFD software Fluent and non-steady-state mass transfer reaction theory .
The situation of the liquid flow is described under the conditions of different number of nozzles in the tower and different liquid to gas ratio, through numerical simulation of specific conditions.
Mathematical model Simulation of air flow field RNG two-equation model [5] is proposed by Yakhot and Orzag.

An experimental result used to validate the Computational Fluid Dynamics (CFD) result.
In conclusion, the two sets of data indicate good agreement and show the utility of CFD as a rating and design tool for coal pulveriser manufacturers.
separation area turret vortex finder vane outlet intlet Fig. 1: The Design description Model Formulation for CFD The simplified classifier model was created by using Solidworks.
Details of the simulation conditions are listed in table the below (Table 1).
Table 1: Simulation conditions Description Value Comment Operating gas velocity · Inlet Velocity Gas density, ρg Gas viscosity, μg 13 m/s 1.225 kg/m3 1.789 kg/ms tangential inlet Air Air Viscous Model Turbulent Model (Realizable k-ε Model) Solution 3-D Double Precision Boundary Conditions · Inlet · Outlet Velocity inlet is 13 m/s Pressure outlet is zero ( P atm) Hydraulic Diameter 0.24 m The meshed geometry contained 134198 nodes and 455677 cells of tetrahedral grids.

In the numerical simulation research, turbulent two-phase flow calculations were performed with a commercial CFD computer code referred to as FLUENT to study the gas-solid two phase flow in the sections of backward-facing step and 90 degree bent pipe respectively by using Euler-Lagrange method.
The deviations between the simulations and experimental data lie in the range of 20%-30%.
These results suggest commercial CFD codes such as FLUENT can be used productively for investigations into gas-solid two-phase flow phenomena and as an aid in pneumatic conveying design.
Summary The results of this research and the comparison between simulation and experimental results are encouraging.
Further research should be devoted on the improving the numerical simulation to predict the nature of the two-phase flow more precisely.

Some mesh models were established to simulate the effect through CFD software.
Through the simulation by CFD software and testing of prototype, it is proved that this new structure can make traditional wind turbine work well in low speed; turbulence and frequent changes in direction of wind conditions.
CFD software is used to simulate the growth rate of the airflow velocity inside the fluid tube.
The CFD software simulation results are shown in Fig.9 and Fig.10.
Fig.9 Velocity vectors around the fluid tube Fig.10Velocity distributes in middle tube cross-section Results of prototype testing A prototype model has been produced to verify the CFD software simulation results.

By analyzing simulation results, the influence of the orifice parameters on the performance of the orifice is clear.
The flow pressure distribution of the fixed throttle orifice is shown in Fig.3 according to the CFD calculation.
Fig.7 shows the characteristic curve of the fixed throttle orifice using CFD analysis.
By simulation comparison, it is d1 = 0.21, d2 = 1.6, L = 0.65, θ = 90 ° that the corresponding electro-hydraulic servo valve has the best performance
Simulation of the Pressure Field for Transient Flow Through a Pipe Orifice.

Establish valve stem leakage flow channel model, apply the CFD numerical simulation the internal flow field and noise.
Through the establishment of the valve stem leakage of three-dimensional flow model, the application of CFD to numerical simulation and analysis of the valve stem leakage of internal flow field and noise, as the theoretical foundation for further research the valve stem leakage.
Fig. 9 Valve acoustic power distribution Fig. 10 Stem leakage acoustic power distribution Conclusion Establish flow channel model of trouble-free and valve stem leakage, apply the CFD numerical simulation the internal flow field and noise, and get the following conclusion
Numerical Simulation and Analysis of Interior Flow Field in Control Valves under the Blocking Fault[J].

Keywords: cylinder cage powder classifier; guide blades; numerical simulation.
The investigation of these flow field characteristics made use of the computational fluid dynamics (CFD) to simulate the air flow in the classifier.
The objective of this research is to compare particle separation performance of various guide vane angles, the CFD simulation can be effective to find out the difference of physical phenomena in cylinder cage powder classifier.
The selection of turbulence model for simulation calculation is very important.
Numerical research on cyclone separator’s separating efficiency model based on CFD [D]. wuxi:Jiangnan university,2008

According to the characteristics of the laboratory, for the condition of using air conditioning that is falling to the ground pattern to assist radiator to heat, use CFD to simulate the airflow organization and thermal environment in laboratory.
By the research methods of combining CFD numerical simulation with on-site testing, a study is made on velocity field, temperature field and thermal comfort in the laboratory in winter.
(5)In this simulation, we use normal double mathematical equation to simulate[2].
Boundary conditon of wall Item Wall Window Roof Floor Door West East South North T(K) 287.97 Adiabatic Adiabatic 287.14 285.5 Adiabatic Adiabatic 287.14 Simulation and Analysis of Thermal Environment Simulation and Analysis of Temperature Field In order to compare with actual measurement data, the boundary conditions of simulation is measured practically [3].
Simulation date is 16/12/2010.We turn on the air conditioner at 1 p.m., discuss the change of temperature in seven minutes.

Optimal Design of Heating and Ventilation for Drying Room Based on Transient CFD Simulation Si Huang 1, a, Tiantian Ding 1, a, Chao Yan 2, b, Zisheng Wang 2,b 1School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China 510640 2Containerization Research Institute, CIMC, Shenzhen, China 518068 ahuangsi@scut.edu.cn, a897750930@qq.com, bchao.man@cimc.com, bzisheng.wang@cimc.com Keywords: Drying room; temperature field; mean age of air; energy-saving Abstract.
By means of simulation, it is possible to significantly shorten the drying time of the container corners, and to achieve the purpose of energy saving. 1.
The finite volume method, widely used in CFD, is adopted in this simulation.
Considering heating process is time-dependent, a transient simulation is performed in this work with 0.1s time step.

Numerical Simulation of Flow Distribution in the Packed Bed Reactor with the Supply Nozzle Placed on the Sidewall Igor A.
Mathematical model The computational fluid dynamics method (CFD) is applied to calculate the pressure distribution and velocity field in the considered device.
Solution procedure The governing equations (Eq. 2 – Eq. 4) were discretized using the finite volume method and solved using commercial CFD software Fluent.
Song, CFD simulation of the effect of upstream flow distribution on the light-off performance of a catalytic converter, Energy Convers.
Rammoser, Optimisation of catalytic converter gas flow distribution by CFD prediction, SAE Technical Paper 930780 (1993)