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The Research of Auger-type Heat Exchanger Fluid Characteristic Based on FLUENT Wang Haiyan1, a, Wang Na1, b, Song Juan 1, c, and Shao Ruiying 1, d 1Qingdao Huanghai College, China a541101645@qq.com, bwnsdu@163.com, c58186190@qq.com, d93659949@qq.com Keywords: Auger-Type Heat Exchanger, Fluid Characteristic, CFD, Fluent Abstract: The auger-type heat exchanger possesses many merits, such as compact structure, high thermal efficiency, and is mainly used in food, oil, natural gas and chemical industry.
The shell-side fluid characteristics are calculated through FLUENT based on computational fluid dynamics (CFD) theory, and the typical regional and cross-section of the shell-side fluid are analyzed in detail.
The numerical simulation [4] is a new research method about computational fluid dynamics and heat transfer, which has been playing an important role on the study and developing of heat exchanger.
Wang: Numerical Simulation Technology and Application of Longitudinal Flow of the Shell Heat exchanger, East China University of Science and Technology, 2000.

The Important Influences For Performance of Multiphase Flow Mixed Microbubble Generator Zhekun Li1, a, Wenli Shi1,b, Wei He1,c and Yujin Fan1,d 1 School of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650093, China azhekunlikust@sina.com, bswl_ie@163.com, chw_big@126.com, dfanyujin@public.km.yn.cn Keywords: Fluid Mechanics, CFD, Multiphase Flow Mixed Microbubble Generator, Influences Abstract.
In the design and research on the performance of the generators based on the Computational Fluid Dynamics (CFD) [4], the researcher need to improve the structure of the generators in order to increase the turbulent energy, which is the key factor to the performance of the generators.
Analysis of different influences The different influences for performance of MFMMG will be analysed by the CFD. 4.1 the performance of the jet nozzle.
Conclusion The important influences for performance of MFMMG had been studied deeply in this paper by means of the CFD.
Green Manufacturing ICRM 2010, (EI: 20104613377310), p. 488-493 [4] Yukihiro Yonemoto, Tomoaki Kunugi: Fundamental Numerical Simulation of Microbubble Interaction Using Multi-scale Multiphase Flow Equation [J].

According to the requirements of Evaluation Standard for Green Building (GB/T 50378), the numerical simulation technique (CFD) is used for the quantitative analysis of the ventilation effect of wind pressure and thermal pressure in different regions.
CFD simulation is to analyze the airflow conditions of a region or room by solving the flow field model with quality, energy, momentum conservation and other basic equation from the microscopic perspective [2].
CFD is used for natural ventilation, mainly for the wind velocity layout optimization of natural ventilation and indoor flow field analysis as well as the flow field simulation of large space, like atrium.
The κ-ε turbulence model is used for simulation and with High reliability[4].
Numerical Simulation of Natural Ventilation of High-Rise Building[J].

The simulation was conducted using the RANS k-epsilon turbulence model by Computational Fluid Dynamics.
In this paper, an aerodynamic drag reduction work has been carried out for a compact EV model through shape optimization by Computational Fluid Dynamics (CFD).
a) Pressure contours on the body surface b) Velocity contours at the symmetry plane Figure 6: Pressure and velocity Contours of the original EV model Results of CFD simulations done on a 128-core blade server of Shanghai Automotive Wind Tunnel Center are documented in Table 1.
Almost each refined model has a lower CD which is calculated by CFD than that of the original EV model.
References [1] Zhang Lei, Fang Haifeng, in: Jounal of Automobile and Parts, No.5(48) (2010), p. 38-41 [2] Wolf-Heinrich Hucho: Aerodynamics of Road Vehicles, SAE book No.R-177 (1997) [3] Jeffrey Hoffman, Bill Martindale and Stephen Arnette: Effect of Test Section Configuration on Aerodynamic Drag Measurements, SAE paper (2001), p. 2001-01-0631 [4] Mohammadi, B., Pironneau, O.: Analysis of the k–ε Turbulence Model, John Wiley & Sons (1994) [5] Yang Zhigang, Schenkel Max: Assessment of Closed-Wall Wind Tunnel Blockage using CFD, SAE Technical Paper Series (2004), p. 2004-01-0672 [6] Wang Jia, Yang Zhigang and Zhu Hui, in: Journal of Jiamusi University (Natural Science Edition), Vol. 30(3) (2012), p. 652-656 [7] Wang Jia, Zhu Hui and Yang Zhigang, Numerical Analysis on Effect of Vehicle Length on Automotive Aerodynamic Drag, 2012 IET ICISCE, Vol.1 (2012), p. 169-173

The computer simulation can replace the test in some extent, therefore, it can shorten the research time, reduce the cost.
As a common CFD software, Fluent can simulate complex flow from incompressible to highly compressible.
Fluent as more mature CFD simulation system, its internal database comes with a variety of laminar and turbulent ink model.
Fluent A brief introduction to Fluent—a general purpose CFD code Journal of Hydrodynamics,2001,16(2):256-259, In Chinese
Numerical simulation of tubular pump based on Fluent[J].

Simulation investigation on Structural Parameter of Hot Air Igniter of Biomass Cui Yongzhang1,2,a *, Tang Mingtian1,b, Zhang Linhua1,2,c, Gao Peng1,d, Zhang Guokai1,e, 1.
Key Laboratory of Building Renewable Energy Utilization Technologies, Shandong Jianzhu University, Ministry of Education, Jinan 250101, China acyz@sdjzu.edu.cn, btangmt91@163.com, czhth0015@sdjzu.edu.cn, d13705319853@126.com, e13964060604@163.com Keywords: Hot air, igniter, biomass, pellet Abstract: In view of rich resources of corn stalks, cotton stalks forming pellets hot ignition performance, using CFD numerical simulation analysis to study the key parameters of electric ignition such as the surface ignition temperature, air velocity, air flow distribution ratio of influence of hot air outlet temperature.
In this paper, using CFD to simulate key parameters of electrically heated hot air ignition, provide the basis for straw biomass pellet fuel ignition.
Inside and outside circulation area ratio , Ainner/Aouter Keep Ainner constant ,by changing the outside area Aouter by increasing the diameter of igniter to get a different Ainner/Aouter , the simulation results under the same Vair are shown in figure 5 and 6.In figure 5，with the increasing of Ainner/Aouter ,the outlet temperature of hot air first increase then decrease ,thus the best Ainner/Aouter is between 1.8 to 2.2 .
Conclusions Through the numerical simulation of the structural parameters of hot air igniter and the ignition experiments to obtain the following conclusions: 1) Improving the heating surface temperature , reducing the air velocity and convective heat transfer coefficient of the external tube could significantly increase the hot air temperature ,and reduce the ignition timing .Therefore the temperature of the hot air should not be below 450℃ 2) The circulation area of internal and external of igniter ratio should be controlled between 1.8-2.2 to ensure the best air flow ratio.

Structure Design and Flow Field Simulation of Magnetic Liquid Suspension Centrifugal Blood Pump Huachun Wua, Zhengyuan Zhangb, Pu Chenc, Yongwu Rend 1 School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, P.
Figure 3 Impeller structure Figure 4 CFD model Figure 5 CFD grid plan Spiral-shaped vortex chamber, that is volute, is adopted in blood pump chamber portion.
Flow Field Simulation of Centrifugal Magnetic Fluid Blood Pump Flow Field Equations of Motion Control.
According to the size of the design, CFD three-dimensional model is drafted by using Solidworks, as shown in Figure 4.
Discuss and Analysis of Simulation Results Get blood pump and impeller pressure distribution, shear stress distribution, speed distribution and Q-H curve by application of flow field simulation software Ansys FLUENT12 to simulate the centrifugal magnetic fluid suspension blood pump internal flow, respectively shown in Figure 6,7,8,9.

In order to examine applicability of the Reynolds-Averaged Navier-Stokes （RANS）using Reynolds Stress equation Model (RSM) and the Large Eddy Simulation (LES) in numerical simulation of centrifugal pump, a series of 3D numerical simulation at the design point and at six off-design points were carried out with the two methods.
Therefore, the computer resources, not propose the Large Eddy Simulation (LES) method in numerical simulations of centrifugal pump.
Introduction In the process of using CFD software to simulate the flow field of centrifugal pump, choosing a proper method that can describe turbulent flow phenomena in centrifugal pump is extremely important[1,2].
LES is a turbulence numerical simulation between the direct numerical simulation (DNS) and RANS [5].
With the rapid advances in computer hardware, the LES study and application become one of the hotspots of CFD [6-8].

FDS [12] is a field model, or known as application of Computational Fluid Dynamics (CFD).
The Navier-Strokes equations are solved in FDS using large eddy simulation to account for subgrid turbulence.
Because of the very large number of cells, CFD models avoid the more generalized engineering equations used in zone models.
For CFD results, smoke layer interface heights are deduced by different methods as described earlier [14,15].
The CFD field model FDS can give good predictions for comparing with the hot smoke test.

This simulation has very important meaning for the temperature and pressure checking at the Beginning of the design.
Liu Yongquan[1] point out that CFD can be used to simulate the process of the gas - steam catapult interior ballistic[2], Shen Guo[3] used to simulate the process of the plane launch.
Result (1)From the contrast with Simulation results and the result got by mathematical method, it shows that, the simulation of the launching process on concentration water injection launcher by FLUENT is credible
So use CFD to simulate the launch process can give many reliability proposals, and can help to design the system.
Numerical Simulation and Parameter Design on Steam-powered Catapult [D].Nanjing Institute of Technology,(2010)