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Numerical simulation of multi-layer rectangle micro-channel heat sink for single-phase flow and heat transfer Lifeng Wang1,a, Baodong Shao1,b, Heming Cheng1,c and Ying He1,d 1Faculty of Civil and Architectural Engineering, Kunming University of Science and Technology, Kunming, People’s Republic of China awanglifeng0314@163.com, bshbd_1221@163.com, cchenghm650093@yahoo.com.cn, dscdx.heying@163.com Keywords: Multi-layer micro-channel heat sink; Heat transfer; Thermal resistance; Pressure drop; Numerical simulation Abstract.
During the simulation, Finite Volume Method (FVM) was used to solve Computational Fluid Dynamics (CFD) problem.
Lauren Boteler et al. [2] used CFD models to identify the impact of varying both the manifold and microchannel fin and channel dimensions, and demonstrated both large velocity gradients between microchannels, as well as fluidic swirling in the microchannels that significantly improved the heat transfer coefficient.
Numerical solution and discussion The numerical simulation is used to verify the cooling performance of optimal micro-channel cooling heat sink by using electronics cooling software that has been previously used in analyzing the heat transfer character in electronics and chip cooling applications, which uses Finite Volume Method (FVM) to solve Computational Fluid Dynamics (CFD) problem.
Compare with the analysis results, the relative error is 7.3858 percent, which shows the numerical simulation agree well with the analysis results.

The values of experimental study and current CFD study are found to be in good agreement.
Simulation is carried out from 0º to 20º.
While the graphs clearly follow the trend and the simulation data does match the experimental results, there is a slight variation which is due to the computational errors from the CFD codes.
Figure 2: Comparison of expt [16] and CFD simulation current study CW Fig. 3 shows the velocity contours for the AoA range 0-20º.
Both the CW experimental and simulation show stall at 15º.

The model equations were computed using the commercial CFD codes ANSYS Fluent 14.0 [2].
Validation of the CFD Model The performance of the CFD model was assessed by comparing the simulation results of the model equations with experimental data from the wind tunnel experiment conducted by a working group of the Architectural Institute of Japan (AIJ) on the flow field around the model of a single high-rise building, aimed at formulating guidelines for the CFD prediction of the pedestrian wind environment around buildings [3].
Main Simulation The two-building configuration simulated consisted of a four-storey building A with a constant height of 12 m and a second building, B, located downwind.
Carissimo, (Eds.), Best practice guideline for the CFD simulation of flows in the urban environment, COST Action 732, quality assurance and improvement of microscale meteorological models, Brussels, COST office, (2007)
Huang, Optimizing layout of urban street canyon using numerical simulation coupling with mathematical optimization, Journal of Hydrodynamics, Ser.

In this study, computational fluid dynamic (CFD) numerical simulation and experimental investigation were used to predict and valid the flow pattern with different geometric housing and operating conditions.
As for the performance determination, not only the predicted result of airflow rate is compared with test measurement, but also the visualization of flow pattern at different operating parameter is conducted with the aid of numerical simulation.
The numerical calculation and visualization analysis are carried out using the CFD software Fluent [6].
This study simulates the complex flow patterns for the hidden ceiling-fan by utilizing the commercial computational fluid dynamics (CFD) software Fluent [6] to solve the fully three-dimensional incompressible Navier-Stokes equations with the standard turbulence model.
Fig. 3 demonstrates the flow patterns of the hidden ceiling fan with and without the fan guard condition in the CFD; meanwhile, the horizontal planes below the blade of 0.25m, 0.5m, 0.75m and 1m are chosen to show the airflow distribution.

Aiming at the inner flowing characteristics of round tube, the different transient cases of tube with rotating wall boundary are analyzed by CFD, and the six cases are determined according to the different rotating speed respectively.
The fluid velocity and its heat transfer from the wall are studied by CFD to deeply uncover such tubes flow characteristics.
CFD Calculation and Analysis CFD analysis is available by ANSYS software, and the tubes are modeled.
In this paper, the inner flowing characteristics of tube with rotating wall are analyzed by CFD.
FLUENT-Example and Application of Fluid Engineering Simulation, first ed., Beijing Institute of Technology Press, Beijing, 2005.

FEM and CFD softwares nowadays are able to handle complex systems and can calculate with continuously changing parameters, making the usage of CFD software adequate for this problem, similarly to other fields of engineering like modeling of the casting process for the industry [3].
For each unique sample holder geometry a fine mesh was generated using the same software, and the data was imported to the FLUENT CFD simulation system as a grid.
Figure 4 Meshed geometry Figure 5 Initial parameters in cooling agent Parallel simulations The simulations were run on the FLUENT CFD package, GAMBIT was used to provide the geometries and the meshes.
With the fully integrated models the CFD simulations ran for 8 hours on 2 processors to simulate the 4.7 second experiments in microgravity or gravity.
With this numerical value the script chose either the initiation of a new simulation with modified thermal conductivity and ran a FLUENT simulation again or stops the model run and saved all data sets.

Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of gyroscope, meshing, loads applying and equation solving, and two dimensional airflow distribution of different outlet diameters in sensitive element are calculated.
In this paper, we use the FLOTRAN CFD analysis of ANSYS software to have a comparative study in the two different nozzle dimensions, and try to illustrate the meaning of outlet dimension improve the properties of fluidic gyroscope.
Fig. 3 Two-dimensional simplified model of cavity Solve with Finite Element Method The FLOTRAN CFD analysis of ANSYS software is an advanced tools used to study two dimensional and three dimensional flow fields, the simulation typically comprises modeling, loading and solving [4].
Select FLOTRAN CFD analysis of ANSYS software.
“Numerical simulation of practical engineering in ANSYS”[M].

amshaiful@unimap.edu.my, bmohdamirulamin@gmail.com, cnazri@fkm.utm.my, dnorwazan@upnm.edu.my, emaelazmi@gmail.com Keywords: Combustion, Computational Fluid Dynamics (CFD), Envo-Diesel, CO2 emissions.
This study is to perform a detailed simulation of combustion and thermal flow behaviors inside the combustor.
The simulations are conducted using the commercial Computational Fluid Dynamics (CFD) package software to determine the spray flames and combustion characteristics of commercial diesel fuel, envo-E5 and envo-E10.
The CFD, Fluent computer code is used to model a 3D steady-state simulation of physical domain which is considered axisymmetric due to axial symmetry of the system.
For spray flame simulation, the results emphasize on diameter and temperature of the fuel droplets.

Through FLUENT numerical simulation, this paper is aimed on studying the influence of outdoor wind environment on indoor environment.
Research Method This paper uses numerical simulation method to study the building indoor and outdoor wind environment.
The computational fluid dynamics (CFD) method is an effective tool for numerical simulation to reality flow phenomena.
CFD numerical simulation method not only cost low, but can meet the accuracy requirements of the engineering design, and the calculation condition of which sets easily, so it is easily for a variety of design scheme set at the beginning of the design [4].
[2] Richao Liu,Zhonghua Tang,Weiyang Qi.Numerical Simulation of Campus Wind Environment[J], Materials Science and Engineering Applications,2011( Part1),In Chinese

The turbulent flow in orifice plate was investigated and solved numerically using 3-D Navier-Stockes (N-S) equations by employing commercial CFD code ANSYS.
For applying CFD, the proper selections of grid level and turbulence model are important to describe fluid motions.
The choice of turbulence model depends on considerations such as the physics encompassed in the flow, the established practice for a specific class of problem, the level of accuracy required, the available computational resources, and the amount of time available for the simulation [10].
The solution was carried out using commercial CFD code ANSYS, version 14.0 and mesh of 2,350,000 elements and convergent solutions were sought such that the residuals fell below error of 10- 4.
CFD analysis of incompressible turbulent swirling flow through Zanker plate.