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PIV Study of the Interrogation Area Size Effect on the Hydrodynamic Results of a Stirred Vessel Equipped by an Eight Flat Blades Turbine
Bilel Ben Amira,
Zied Driss,
Mohamed Salah Abid
Issue:
Volume 1, Issue 3, August 2015
Pages:
42-48
Received:
5 June 2015
Accepted:
19 June 2015
Published:
23 June 2015
DOI:
10.11648/j.ijfmts.20150103.11
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Abstract: The aim of this paper is to investigate the interrogation area size effect on the hydrodynamic results of a stirred vessel equipped with an eight flat blades turbine. Particle image velocimitry (PIV) technique was used in order to compute the velocity field in the vessel. This PIV system is equipped with a Nd:YAG 532 nm laser, a CCD camera and a mini synchronizer. In this study, it has been observed that the interrogation area size has a direct effect on the results efficiency. According to the achieved results, for a grid size between 12x12 pixel² and 128x128 pixel², it has been observed that the parameters selection has a great influence on the experimental results. Particularly, it has been noted that the maximum areas size increases by increasing the interrogation area size.
Abstract: The aim of this paper is to investigate the interrogation area size effect on the hydrodynamic results of a stirred vessel equipped with an eight flat blades turbine. Particle image velocimitry (PIV) technique was used in order to compute the velocity field in the vessel. This PIV system is equipped with a Nd:YAG 532 nm laser, a CCD camera and a mi...
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Thermodynamic Study of the Active Magnetic Regenerative Refrigeration in Transitional Regime
Zina Meddeb,
Rabaa Ben Sidhom,
Khouloud Azaeiz,
M. Razak Jeday
Issue:
Volume 1, Issue 3, August 2015
Pages:
49-53
Received:
9 June 2015
Accepted:
19 June 2015
Published:
23 June 2015
DOI:
10.11648/j.ijfmts.20150103.12
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Abstract: Magnetic refrigeration is an emerging technology based on the magnetocaloric effect. In this paper, the magnetocaloric effect is remembered. The components of magnetic refrigeration system are described. An analogy between magnetic refrigeration and conventional refrigeration is done concerning the steps and the original work received by the system. A regenerator positioned between the hot source and the cold source increases the efficiency of the refrigeration system, from which the active magnetic regenerative refrigeration (AMRR) is studied. Thus a thermodynamic study is developed and thermal regenerator study transitional regime is done. From the results obtained by the numerical calculation, the difference of temperature between hot and cold sides reaches a limit after a certain number of cycles. This number of cycles (Nc) necessary to wait for the permanent regime depends on the difference in temperature hot side and cold side (∆T), the flow regime and the magnetocaloric effect (MCE) of the regenerator. Moreover this work allowed us to study the thermal and fluidic behavior of the magnetic regenerative refrigeration, as well as to determine the flux exchanged during magnetization and demagnetization.
Abstract: Magnetic refrigeration is an emerging technology based on the magnetocaloric effect. In this paper, the magnetocaloric effect is remembered. The components of magnetic refrigeration system are described. An analogy between magnetic refrigeration and conventional refrigeration is done concerning the steps and the original work received by the system...
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Fluid Dynamic Study of a NACA2415 Airfoil Type Wind Turbine with a Wedging Angle Equal to 30°
Tarek Chelbi,
Zied Driss,
Ahmed Kaffel,
Mohamed Salah Abid
Issue:
Volume 1, Issue 3, August 2015
Pages:
54-58
Received:
11 June 2015
Accepted:
26 June 2015
Published:
1 July 2015
DOI:
10.11648/j.ijfmts.20150103.13
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Abstract: In this paper, numerical simulations and experimental validation were carried out to gain an insight into the complex flow field developing around a small wind rotor and to evaluate its performance. We consider the Navier-Stokes equations in conjunction with the standard k-ε turbulence model to study the aerodynamic parameters of a NACA2415 airfoil type wind turbine. These equations are solved numerically to determine the local characteristics of the flow and the models tested are implemented using the open source "SolidWorks Flow Simulation".Experiments have been also conducted on an open wind tunnel equipped by a small NACA2415 airfoil type wind turbine to validate the numerical results. This will help improving the aerodynamic efficiency in the design of packaged installations of the NACA2415 airfoil type wind turbine.
Abstract: In this paper, numerical simulations and experimental validation were carried out to gain an insight into the complex flow field developing around a small wind rotor and to evaluate its performance. We consider the Navier-Stokes equations in conjunction with the standard k-ε turbulence model to study the aerodynamic parameters of a NACA2415 airfoil...
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Performance of a Typical Simple Gas Turbine Unit under Saudi Weather Conditions
Saleh S. Baakeem,
Jamel Orfi,
Hany AlAnsary
Issue:
Volume 1, Issue 3, August 2015
Pages:
59-71
Received:
4 June 2015
Accepted:
30 June 2015
Published:
2 July 2015
DOI:
10.11648/j.ijfmts.20150103.14
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Abstract: Gas turbine units are widely used in KSA and other countries particularly during the peak demands and in inland regions. They produce about 50% of the total capacity of power generation in the kingdom. Despite their numerous advantages, their thermal efficiency remains very low and their resulting environmental impacts are significant. In this study, the effect of ambient conditions on the performance of a typical gas turbine used in KSA has been studied theoretically using the average hourly temperature and relative humidity for three regions of the country (Eastern, Central, and Western) which have almost the same power demand. Mass and energy balance equations with typical and realistic specifications of power plant units have been used to develop the model. The results present time variations of power generation, fuel consumption and efficiency for several typical cities. The maximum monthly power loss due to weather variation in Riyadh, Ad Dammam, and Jeddah are estimated at 8.9, 9.41 and 9.32 GWh respectively. While the annual power production loss in Riyadh, Ad Dammam, and Jeddah are 7.1, 8.2, and 11.2%, respectively. Power generation increases to about 4220 and 3028 kW when inlet air is cooled to 8.9 and 10.15oC, respectively. In conclusion, the effect of weather conditions of several Saudi areas on the performance of gas turbine units is significant. Therefore, the incorporation of inlet cooling technologies should be considered seriously.
Abstract: Gas turbine units are widely used in KSA and other countries particularly during the peak demands and in inland regions. They produce about 50% of the total capacity of power generation in the kingdom. Despite their numerous advantages, their thermal efficiency remains very low and their resulting environmental impacts are significant. In this stud...
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Heat and Mass Transfer in 3D Inclined Lid-Driven Solar Distiller
Issue:
Volume 1, Issue 3, August 2015
Pages:
72-82
Received:
3 January 2016
Accepted:
15 January 2016
Published:
26 February 2016
DOI:
10.11648/j.ijfmts.20150103.15
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Abstract: This work is dedicated to study numerically an inclined solar distiller subject of a moving cold wall. The cavity is heated from left side and cooled from the right one. Constant and different concentrations are imposed in the two vertical sides of the cavity, while the other walls are adiabatic and impermeable. The flow is considered laminar and caused by the interaction of the thermal energy and the chemical species diffusions. Equations of concentration, energy and momentum are formulated using vector potential-vorticity formulations in its three-dimensional form, then discretized by the finite volumes method. The Rayleigh, Prandtl, Lewis numbers and buoyancy ratio are respectively fixed at Ra=105, Pr=0.7, Le=0.85 and N=0.85. Reynolds number (Re) is varied along the study from 0 to 150. The angles for the cavity inclination under this investigation are considered to be 0°, 30°, 45°, 60° and 90°. A particular interest to the flow structure and evolution of the heat and transfer i highlight in this paper.
Abstract: This work is dedicated to study numerically an inclined solar distiller subject of a moving cold wall. The cavity is heated from left side and cooled from the right one. Constant and different concentrations are imposed in the two vertical sides of the cavity, while the other walls are adiabatic and impermeable. The flow is considered laminar and c...
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