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The effects of channel designs on PEMFC performance would be investigated by numerical simulation analysis.
The solid model for flow field simulations was shown in Fig. 1.
The post process of CFD results was achieved with the TECPLOT and Field-View software.
Before conducting the CFD runs with the complicated tree-like flow structure, a preliminary study on the single unit of four-branching channel was performed.
Only half of the computational domain was considered in simulations due to the symmetric channel configuration.

Germain and Baier. [19] Performed numerical simulations on turbine blade channels to identify the flow structure and quantity the secondary flows that are essential for the investigation of losses in a turbine blade channel.
Alameldin et al. [20], performed a CFD Analysis to study the increase in total losses of a transonic turbine blade subjected to film cooling.
The transport equation is additional term utilize to simulates a non-reacting gas mixture when this gases jet in to a cross-flow at different density; the simulations were processed using the CFX software from ANSYS, Inc.
The numerical simulation of the coolant flow through hole system is carried out using the CFD package Ansys CFX coupled with the optimization technique to maximize the film cooling effectiveness.
[16] Lakehal, D., Near-Wall Modeling of Turbulent Convective Heat Transport in Film Cooling of Turbine Blades with the Aid of Direct Numerical Simulation Data.

Coming into being at the end of 1970s, Computational Fluid Dynamics (CFD) has gained a perfect development in the recent 30 years.
Contributing to its short design time, low cost and direct observation, CFD becomes the serendipity of increasing water pump factories.
Calculation Results and Analysis Experimental data and Simulation data.
The simulation data under rated conditions can be obtained by the above equation.
The Computational Fluid Dynamics Analysis——CFD Software Principle and Application (TsingHua University Press,2004)

Numerical Simulation Study on Airflow Structural Characteristics in Real Human Airways Model SUN Dong1,a, LI Fu-Sheng1,b, XU Xin-Xi1,c, LIU Ya-Jun1, TAN Shu-Lin1 1Institute of Medical Equipment, Academy of Military Medicine Sciences; National Biological Protection Engineering Center, Tianjin 300161 China axizhilang-dongdong@163.com, bfsisok@163.com, cxuxx1@sohu.com c.
Corresponding author,Tel:022-84656705; E-mail:xuxx1@sohu.com Keywords: human airways; transient airflow movement; airflow patterns; numerical simulation Abstract.
In this paper, the SST simulation was used to simulate precise flow field in human upper respiratory tract in the conditions of the low intensive respiratory patterns.
Because of this, it can be coupled with CFD code.
The former is coupled with SST turbulence model which is used to open the turbulent kinetic energy in the downstream of turning point in order to trigger the local transition; the latter is used to catch the influence of offsite turbulence intensity and also connect the empirical correlation with the transition starting standards intermittent factor transport equations. 1.3 Numerical simulation In the computing of the flow field, its boundary conditions we set are: we conduct simulation researches on transient airflow movement in model of mouth-throat under the low intensity circular breathing mode.

Numerical Simulation on South American Coal Reburning in a Pulverized Coal Combustor Zifang Wang1, Jianli Liu2, Liansheng Liu1, Bing Xia1, Jinxiang Wu1, Enyu Wang1, Xiang Gou1, a 1School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China 2Bohai oil water and power service company, Donggu Oil New Village, Binhai New Area, Tianjin 300452, China aCorresponding author email: gouxiang@sina.com Keywords: simulation; NOx; South American coal; reburning Abstract.
In this paper, CFD software has been used to simulate the reburning process of South American coal(SAm) so as to study the effect of the reburning on the combustion in the furnace and NOx reduction.
Mathematical model CFD software for calculating the three-dimensional turbulent flow is used in this paper.
Carla, Reburning and burnout simulations of natural gas for heavy oil combustion, Fuel. 83 (2004) 109-121

On the other hand, we also used simulation software on PC to analysis the flow field and electric field for our design.
Fig. 5 Glass substrate and PDMS channel Fig. 6 Micro channel design and DEP-QCM device Pro/E Model and CFD Analysis After we made the design of micro chip and structure of micro channel, we can saved as the IGS file type and then analysis in the CFD-GEOM and CFD-ACE software.
We need to set up grid for every when a 3-D structure need any analysis, and this work can complete in CFD-GEOM.
After all pretreatment had done, those parameters will be set in CFD-ACE (Table 1).
We can see the design structure clearly in the CFD-ACE window and wait for some minutes to get the analysis result and modify the parameter to restart analysis (Fig. 7).

Therefore, in this work, a double inlet cyclone separator was designed for natural gas dehydration, and the numerical simulations of the gas-particle flow are presented by the commercial CFD software FLUENT 6.3.
Cyclone dimension used in this simulation are as shown in Fig.1.
In the numerical simulation, the above discussed Reynolds stress model (RSM) is used for the turbulent flow.
In the simulation, the steady solver is performed using the 10-3 convergence criterion accuracy for the calculation.
Kanani: CFD analysis of flow field in square cyclones, Powder Technol (2009), p. 349-357.

Design Builder, Energy Plus Simulation; 1.1.1.4.
Ansys CFD; 1.1.2.2.
Star-CD CFD; 1.1.2.4.
AutoCAD Simulation; 1.1.2.5.
Solidworks CFD; 1.1.2.6.

Numerical Simulation for the Optimization of the angle of the velocity of the Hydrogen in the High Performance Hydrogen Bell-type Annealers Shunli Fang a, Shiping Jin b, Yongxiang Zhang, Suyi Huang, Wuqi Wen State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, China afshunli@gmail.com, bjsping@china.com.cn Keywords: high performance hydrogen bell-type annealers angle velocity numerical simulation Abstract.
Sun Chen [8] uses the CFD software to simulate a quarter of an annealer, while he has not consider the impact of the internal circulation fan, the result shows that most of the circulating hydrogen flow through the top flow channel, and the circulation of hydrogen volume from the convection board is very small, and with the increase of the total circulation of hydrogen, the ratio of the hydrogen flow through the top flow channel would increase, but the change is very little in the overall.
Table 1 The details of the axial angle and the tangential angle of the model Tangential angel Axial angle 0º 30º 45º 60º 90º 0º √ × × × × 30º √ √ √ √ √ 45º √ √ √ √ √ 60º √ √ √ √ √ 90º × × × × × In this simulation we use standard k-ε model to solve the turbulence equations, and because the goal of this study is the distribution of hydrogen in the inner bell, so we have not considered the energy model, and we consider the hydrogen as an ideal gas in this simulation.
On-line Numerical Simulation of Steel Coils’ Annealing Process in Bell-type Furnaces with High Performance Hydrogen.
The Instruction and Application in Engineering of CFD.

The end clearance is the main geometrical parameter to establish the CFD analysis model.
Numerical simulation analysis of the flow field was carried out base on the above models by FLUENT.
The simulation results shown as follows: 1.
Numerical simulation of flow field of NC-Electrochemical contour evolution machining based on CFD technology.
Journal of system simulation, 21(2009)73-75