Search results

Numerical Study on Flow Characteristics in a Stirring Vessel LIANG Ruquan1,a, JI Junhong1,2,b, Yan Fusheng3,c and HE Jicheng1,d 1Key Laboratory of National Education Ministry for Electromagnetic Process of Materials, Northeastern University, 110819, Shenyang, China 2School of Mechanics and Engineering, Liaoning Technical University, 123000, Fuxin, China 3Research Institute, Northeastern University, 110819, Shenyang, China aliang@epm.neu.edu.cn, bji_jh@163.com, cfusheng_yan@mail.neu.edu.cn, dhejc0432@sina.com Key words: Numerical simulation; Stirring vessel; Desulphurization of molten iron; Flow field Abstract.
In order to improve the desulphurization efficiency of KR mixing method in the process of molten iron refining, the method of CFD was used to analyze the flow field in a stirring vessel.
With the development of modern computing technology, the simulation of CFD provides the high accuracy.

A preliminary study of Computational Fluid Dynamics (CFD) on the effect of high Reynolds numbers in the cavity has been carried out.
Streamline comparison between experiment [3] (left) and simulation (right) Results and Discussions Different flow patterns were identified in every simulation conducted in this study.
There were two vortices occurred in the cavity of each simulation with high Reynolds number Re=10000 as shown in Fig 3.
The simulation of the flow inside the cavity also calculated the pressure along the top layer of the cavity and tabulated in the graph.
Shaughnessy, CFD Simulation of contaminant decay for high reynolds flow in a controlled environment, Annals of Occupational Hygiene 54 (1) (2010) 88–99

In this paper, the simulation analysis has been done using the software FLUENT on the basis of theoretical analysis of the sensor, and the optimization design of the flow sensor structure has been given according to the analysis results, the results show that the flow characteristics of the sensor has been improved. 1.
Currently, two ways to obtain the flow field of the flow sensors, namely direct measurement, and software testing numerical simulation.
However, the computational fluid dynamics (CFD) is a primary tool to analyse the built-in flow sensor’s flow field, and to understand the interaction working rules between fluid and structural components of the sensor and to optimize the parameters of the sensor’s structure[1][2][3].
In this paper, the simulation analysis has been done using the software FLUENT on the basis of theoretical analysis of the sensor, and the optimization design of the flow sensor structure has been given according to the analysis results, the results show that the flow characteristics of the sensor has been improved.
CFD design analysis and struture improvement The flow field simulation of the flow sensor has been done using the CFD software FLUENT, the settings of the initial parameters of the simulation as follows: the mass flow rate entrance is 0.1 kg/s, the pressure exportation is 823200Pa, and the angular velocity of the impeller is 49.6rad/s according to the project demands. 3.1 Simulation analysis and improvement of the impeller Fig. 3 Mesh generation of the geometric body model Flow region geometric body model has been established in order to simulate the internal flow fieldof the flow sensor, and then the mesh generation of the geometric body model has been done using the commercial software GAMBIT, just as shown in Fig.3.

Several turbines with different geometries of the crowns were compared, whose power coefficients were numerically simulated by the CFD method.
Before the beginning of turbine designing, the CFD techniques concerned in the turbine flow simulation were introduced as following.
By the results of turbines flow simulation, power coefficients of the two turbines are listed in table 2.
Aerofoil Characteristics from 3D CFD Rotor Computations [J].
Computer Simulation, 2010, 27(3):276-280 (in chinese).

CFD Simulations.
The ANSYS ICEM/CFD software is used to construct two-dimensional geometry model and the body fitted computational mesh.
Therefore, the aerodynamic performances of two different thickness airfoils as NACA6412 and NACA6422 are also calculated with CFD simulations.
The two-dimensional CFD simulations and Taguchi analysis on the aerodynamic performance of cambered airfoils suggested that the NACA64XX airfoils exhibited the maximum lift-to drag force coefficient for low Reynolds number flow conditions. 2.
Fig. 1 CFD Simulations blade-section research.

On the basis of the theory of the orthogonal test method and the requirement of the design on the stirring system, the factors and their levels of numerical simulation experiment are confirmed and the orthogonal test scheme is established in this paper.
Also the numerical simulation for mixing process of stirring system of the blender truck is carried out with CFD software.
In order to design reasonable stirring system, improve the stirring effect, on the basis of the main influence factors, the numerical simulation is carried out through combining the orthogonal test method and the CFD simulation method.
According to the simulation results, the time stirred uniformly of each group is shown in Table 3.
Table 5 The optimal structure size of stirring system A B C D E[m] G H the 2nd combined form 0.54 0.54 0.171 0.335 the hinge form 6 Conclusions According to the result of the numerical simulation and the range analysis method of orthogonal test, the influence degree of the factors for stirring effect is obtained.

Savvas Xanthos and Minwei Gong developed a Computational Fluid Dynamics (CFD) model[12].
To solve this problem, FLUENT, a CFD code, was employed to investigate hydraulic characteristics and an object function of was presented to evaluate hydraulic efficiency of settling tank in this paper.
Mathematic Model FLUENT is used to perform the numerical simulation by solving conservation equations for mass and momentum.
W: Simulation of hydrodynamic and transport characteristics of rectangular settling tank, in Transport of Suspended Solids in Open Channels, ed.
[12] Savvas Xanthos, Minwei Gong: Performance Assessment of Secondary Settling Tanks Using CFD Modeling.

The simulation scenario of leakage and diffusion assumes that LNG transport ships had an accident on the sea.
Gavelli [14] (2011) simulated the process of deflagration of nature gas when LNG loaded on the transport ship by using CFD software FLACS .Edward Bullister [15]simulated the Falcon text and indicated that it was feasible to utilize CFD software with suitable coefficient and boundary conditions to simulate the diffusion process of LNG.
Research of LNG focused on simulation and risk assessment in china, Qin Huang from Nanjing university of technology analyzed different models for LNG leakage simulation and compared foreign experimental date with simulated result.
Many experimental data and images obtained by experiments provided important materials for simulation study.
Many scientific problems such as RPT, the formation conditions of the pool fire are not intensive studied. 3, With the maturation of the CFD technology, Experts and scholars have carried out some researches of LNG through simulation now.

Through Two-dimensional CFD software, Zamora et al. [5] did a simulation about vertical solar chimney when it is affected simultaneously by wind pressure and thermal pressure, and analyzed the effect of the chimney structure to ventilation when there is wind pressure.
When devising grid, the near wall face should be encryption processed, to assure the accurate simulation of the velocity gradient of the wall.
Through computing to simplify simulation, the solar radiation is transformed into the constant heat flux of absorption wall and glass in chimney.
In document [6], the writer identified the reliability of solar chimney simulation result and experiment result.
Numerical simulation of Enhanced Natural Ventilation with solar energy chimney (in Chinese) [J].Building Science, 2006, 22(6A):26-29

The thermo-hydraulic performance of the first wall for CH HCSB TMB was investigated, corresponding analysis have been carried out using CFX, a computational fluid dynamics (CFD) code.
The simulation results show that the maximum temperature 565℃ of the FW is slightly above the allowable temperature limit 550℃ of material.
A commercial Computational Fluid Dynamics (CFD) code, CFX, was used for thermo-hydraulic.
In this simulation k-ε turbulence model was used with scalable wall function.
The simulation results show that the corner of the FW is slightly above the allowable temperature limit.