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Study of the Computational Domain Effect on the Aerodynamic Structure Around a Savonius Wind Rotor
Sobhi Frikha,
Zied Driss,
Hedi Kchaou,
Mohamed Salah Abid
Issue:
Volume 1, Issue 2, June 2015
Pages:
20-24
Received:
18 May 2015
Accepted:
28 May 2015
Published:
29 May 2015
Abstract: This study aims to investigate the effect of the computational domain on aerodynamic characteristics of the flow around a Savonius wind rotor. For thus, we have developed a numerical simulation using CFD code. The considered numerical model is based on the resolution of the Navier-Stokes equations in conjunction with the standard k-ε turbulence model. These equations were solved by a finite volume discretization method. Particularly, we are interested to visualize the velocity field, the mean velocity and the static pressure. The good comparison of our numerical results with anterior results confirms the validity of the numerical method.
Abstract: This study aims to investigate the effect of the computational domain on aerodynamic characteristics of the flow around a Savonius wind rotor. For thus, we have developed a numerical simulation using CFD code. The considered numerical model is based on the resolution of the Navier-Stokes equations in conjunction with the standard k-ε turbulence mod...
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An Experimental Investigation on Addition of Bentonite on Tannery Wastewater Characteristics
Mohamed Ahmed Adam Khdam,
Abusabah E. Elemam,
Mohamedabusgra E. Elmam
Issue:
Volume 1, Issue 2, June 2015
Pages:
25-29
Received:
20 May 2015
Accepted:
31 May 2015
Published:
1 June 2015
Abstract: In this study, wastewater generated from Africa tannery in Khartoum North was investigated for removing of chromium from a wastewater by utilizing Bentonite. Experiments were carried out in order to obtain the optimum dose of Bentonite to be applied for the best removal of chromium and other wastewater parameters which include chemical oxygen demand, Oil and grease, total suspended solid, and chloride. For a 15mg/L dose of Bentonite removal rates of 99%, 44%, 94%, 75% and 53% of chromium(Cr), chemical oxygen demand (C.O.D), total suspended solid (T.S.S) and chloride (Cl) were respectively obtained. The Removal time for the above dose 15 mg/L was 6 hours. The results of the test were statistically analyzed by regression technique and a predication model was obtained after three trends of testing (linear, Exponential and polynomial). The exponential trend was the best (R2=0.9368). The prediction model was validated by comparing predicted and measured data and good fit of data were obtained. Therefore, the use of Bentonite to remove chromium is considered as a very successful method, and it can be a solution to the problem of industrial waste resulting from the tanning industry.
Abstract: In this study, wastewater generated from Africa tannery in Khartoum North was investigated for removing of chromium from a wastewater by utilizing Bentonite. Experiments were carried out in order to obtain the optimum dose of Bentonite to be applied for the best removal of chromium and other wastewater parameters which include chemical oxygen deman...
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The Thermo-dependence Effects on Buoyancy Convection Heat Transfer in a Square Enclosure, Filled with Shear-thickening Power-law Fluids and Submitted to Cross Uniform Heat
M. Kaddiri,
M. Naimi,
A. Raji,
M. Hasnaoui
Issue:
Volume 1, Issue 2, June 2015
Pages:
30-35
Received:
20 May 2015
Accepted:
12 June 2015
Published:
15 June 2015
Abstract: Two-dimensional steady-state buoyancy driven flows of thermo-dependent shear-thinning power-law fluid confined in a square cavity, submitted to cross uniform heat fluxes, has been conducted numerically using a finite difference technique. The parameters governing the problem are the thermo-dependence number m (0≤m≤10) and the ratio between the heat flux imposed on the vertical walls and that imposed on the horizontal ones represented by a (0≤a≤1), while the flow behavior index n is fixed at (n=1.4) and the Rayleigh number at (R_a=5000). The effects of these parameters on the flow structure and heat transfer characteristics have been analyzed.
Abstract: Two-dimensional steady-state buoyancy driven flows of thermo-dependent shear-thinning power-law fluid confined in a square cavity, submitted to cross uniform heat fluxes, has been conducted numerically using a finite difference technique. The parameters governing the problem are the thermo-dependence number m (0≤m≤10) and the ratio between the heat...
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Numerical Investigation of Nucleate Boiling Flow in Water Based Bubble Bumps
R. Garma,
M. Bourouis,
A. Bellagi
Issue:
Volume 1, Issue 2, June 2015
Pages:
36-41
Received:
3 June 2015
Accepted:
16 June 2015
Published:
17 June 2015
Abstract: In this paper, numerical simulations of nucleate boiling flow bubble pumps are conducted with the commercial CFD (Computational Fluid Dynamics) package ANSYS-FLUENT. The Eulerian multiphase flow framework model was used to model the phase’s interaction. User-Defined Functions (UDFs) are provided to compute the wall heat transfer and to calculate in-ter-phase heat and mass transfer. The heat flux from the wall is divided into three parts according to a wall heat partitioning model based on three mechanisms including convective heat for heating the bulk liquid, evaporative heat for generating vapor and quench heat for heating the liquid in the nucleation sites. The rate of vapor formation is obtained by adding the mass exchange at the bubble surface and the bubble formation due to heat flux at the wall. Constant heat fluxes are applied to the stainless-steel made tube wall. In the simulation results we discuss the radial temperature distribution and the radial and axial profiles of the vapor void fraction in the pipe to localize the onset of vapor generation in the pump tube.
Abstract: In this paper, numerical simulations of nucleate boiling flow bubble pumps are conducted with the commercial CFD (Computational Fluid Dynamics) package ANSYS-FLUENT. The Eulerian multiphase flow framework model was used to model the phase’s interaction. User-Defined Functions (UDFs) are provided to compute the wall heat transfer and to calculate in...
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