Science Publishing Group: American Journal of Modern Energy: Table of Contents
<i>American Journal of Modern Energy (AJME)</i> publishes original research papers on all new experimental and/or theoretical results of Physics, chemistry, plasma, energy and Process engineering. Subject matter includes General Physics, thermodynamics, Low temperature physics, Heat and mass transfer, Phase Change Material, Diphase flow, Nanofluid, Fluid mechanics, Electric discharges, Lightning discharges, Plasma chemical reactions, Plasma simulation, Energy storage, Biomass energy sources, Energy conservation, Energy analysis, Energy efficiency, Renewable energy, Energy use, Solar Energy, Chemical Engineering and Fuel Cell. It aims to promote rapid communication and dialogue among the researchers, scientists, engineers and policy makers working in the areas of Physics, chemistry, plasma and energy.
http://www.sciencepublishinggroup.com/j/ajme Science Publishing Group: American Journal of Modern Energy: Table of Contents
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American Journal of Modern Energy
American Journal of Modern Energy
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Heat Generation/Absorption Effect on Natural Convection Heat Transfer in a Square Enclosure Filled with a Ethylene Glycol - Copper Nanofluid Under Magnetic Field
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150101.11
This paper examines the natural convection in a square enclosure that is filled with a nanofluid. This nanofluid with Ethylene Glycol based containing Copper nanoparticle is influenced by a uniform horizontal magnetic field and uniform heat generation or heat absorption. The enclosure is bounded by two isothermal vertical walls at different temperatures and by two horizontal adiabatic walls. The governing equations needed to deal this problem (mass, momentum, and energy) are solved numerically using the commercial simulation software COMSOL Multiphysics. In order to increase the natural convective heat transfer in a square cavity, the effect of heat generation or absorption on the isothermal, streamline contours and the Nusselt number are studied when the Prandtl number is Pr = 151.
This paper examines the natural convection in a square enclosure that is filled with a nanofluid. This nanofluid with Ethylene Glycol based containing Copper nanoparticle is influenced by a uniform horizontal magnetic field and uniform heat generation or heat absorption. The enclosure is bounded by two isothermal vertical walls at different temperatures and by two horizontal adiabatic walls. The governing equations needed to deal this problem (mass, momentum, and energy) are solved numerically using the commercial simulation software COMSOL Multiphysics. In order to increase the natural convective heat transfer in a square cavity, the effect of heat generation or absorption on the isothermal, streamline contours and the Nusselt number are studied when the Prandtl number is Pr = 151.
Heat Generation/Absorption Effect on Natural Convection Heat Transfer in a Square Enclosure Filled with a Ethylene Glycol - Copper Nanofluid Under Magnetic Field
doi:10.11648/j.ajme.20150101.11
American Journal of Modern Energy
2015-06-17
© Science Publishing Group
Mohamed Bechir Ben Hamida
Kamel Charrada
Heat Generation/Absorption Effect on Natural Convection Heat Transfer in a Square Enclosure Filled with a Ethylene Glycol - Copper Nanofluid Under Magnetic Field
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1
16
16
2015-06-17
2015-06-17
10.11648/j.ajme.20150101.11
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150101.11
© Science Publishing Group
Structure Evolution in Odd-Even Eu- 155 Nucleus within IBFM-2
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150101.12
In this work, We investigate the energy levels and the electromagnetic transition probabilities B(E2) and B(M1) for Eu-155 within framework of IBFM-2. The results are in reasonably agreement with the available experimental values. The result of an IBFM-2 multilevel calculation with the 3s1/2, 2d3/2, 2d5/2, and 1g7/2 single particle orbits is reported for the positive parity states of the odd-mass Eu-155 isotopes. Also, an IBM-2 calculation is presented for the low-lying states in the even-even Sm-154 core nucleus.
In this work, We investigate the energy levels and the electromagnetic transition probabilities B(E2) and B(M1) for Eu-155 within framework of IBFM-2. The results are in reasonably agreement with the available experimental values. The result of an IBFM-2 multilevel calculation with the 3s1/2, 2d3/2, 2d5/2, and 1g7/2 single particle orbits is reported for the positive parity states of the odd-mass Eu-155 isotopes. Also, an IBM-2 calculation is presented for the low-lying states in the even-even Sm-154 core nucleus.
Structure Evolution in Odd-Even Eu- 155 Nucleus within IBFM-2
doi:10.11648/j.ajme.20150101.12
American Journal of Modern Energy
2015-06-19
© Science Publishing Group
Saad N. Abood
Mohamed Bechir Ben Hamida
Laith A. Najim
Structure Evolution in Odd-Even Eu- 155 Nucleus within IBFM-2
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24
24
2015-06-19
2015-06-19
10.11648/j.ajme.20150101.12
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150101.12
© Science Publishing Group
Calibration of UV-Radiation Dose with Irradiation Time for CR-39 Track Detector by Using UV-visible Spectrophotometer
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150102.11
Nuclear track detector type CR-39 irradiated by two UV-irradiation methods at wavelength 254nm . First method was PEN-ray-lamp UV-irradiation with the distance 4cm between UV source to CR-39 detector and the range of irradiation time - TD were 10,100 and 1000 s . Second method was FLX-20 transiluminator 15W energy amount with the distance 10 cm between UV source to CR-39 detector and therange of irradiation dose - DT were 2 , 6 , 9 and 10J/cm2. The absorbance-A was determine from UV-visible spectroscopy at the measuring range from 300 – 500 nm for each method .The absorbance differences [ΔA]350 and [ΔA]550 for irradiated and un-irradiated CR-39 detector were measured between absorbance value at wavelength 350nm and 550nm respectively . In this study determined the linear relationship between the increasing of TD(s) and DT(J/cm2) with increasing of [ΔA]350 and [ΔA]550 .This work obtained that FLX-20transiluminator ( second method) was used as a calibration route to PEN-ray-lamp ( first method) after measuring the absorbance deference [ΔA]350 and [ΔA] 550 for CR-39 detector.
Nuclear track detector type CR-39 irradiated by two UV-irradiation methods at wavelength 254nm . First method was PEN-ray-lamp UV-irradiation with the distance 4cm between UV source to CR-39 detector and the range of irradiation time - TD were 10,100 and 1000 s . Second method was FLX-20 transiluminator 15W energy amount with the distance 10 cm between UV source to CR-39 detector and therange of irradiation dose - DT were 2 , 6 , 9 and 10J/cm2. The absorbance-A was determine from UV-visible spectroscopy at the measuring range from 300 – 500 nm for each method .The absorbance differences [ΔA]350 and [ΔA]550 for irradiated and un-irradiated CR-39 detector were measured between absorbance value at wavelength 350nm and 550nm respectively . In this study determined the linear relationship between the increasing of TD(s) and DT(J/cm2) with increasing of [ΔA]350 and [ΔA]550 .This work obtained that FLX-20transiluminator ( second method) was used as a calibration route to PEN-ray-lamp ( first method) after measuring the absorbance deference [ΔA]350 and [ΔA] 550 for CR-39 detector.
Calibration of UV-Radiation Dose with Irradiation Time for CR-39 Track Detector by Using UV-visible Spectrophotometer
doi:10.11648/j.ajme.20150102.11
American Journal of Modern Energy
2015-07-01
© Science Publishing Group
Hussain A. Al-Jobouri
Mohamed Bechir Ben Hamida
Nada F. Tawfiq
Fala Hatem Taha
Calibration of UV-Radiation Dose with Irradiation Time for CR-39 Track Detector by Using UV-visible Spectrophotometer
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29
29
2015-07-01
2015-07-01
10.11648/j.ajme.20150102.11
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150102.11
© Science Publishing Group
Experimental and Numerical Investigations of Transient Natural Convection in Differentially Heated Air-Filled Tall Cavity
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150102.12
The two-dimensional laminar natural convective transient flow characteristics in a differentially heated air-filled tall cavity with gradual heating are investigated both experimentally and numerically for various parameters such as Rayleigh number and temperature difference. Experimental computations are performed for temperature difference varying from (∆T = 5°C) to (∆T = 23°C) while the Rayleigh number varies from (Ra = 2929) to (Ra =11772) to cover a wide range of the flow field inside the cavity. The results show that as the Rayleigh number increases the flow becomes unstable. Also, the flow characteristics are observed to be multi-cellular and time variant especially at high Rayleigh numbers. Moreover, numerical computations are performed to compare with the experimental results.
The two-dimensional laminar natural convective transient flow characteristics in a differentially heated air-filled tall cavity with gradual heating are investigated both experimentally and numerically for various parameters such as Rayleigh number and temperature difference. Experimental computations are performed for temperature difference varying from (∆T = 5°C) to (∆T = 23°C) while the Rayleigh number varies from (Ra = 2929) to (Ra =11772) to cover a wide range of the flow field inside the cavity. The results show that as the Rayleigh number increases the flow becomes unstable. Also, the flow characteristics are observed to be multi-cellular and time variant especially at high Rayleigh numbers. Moreover, numerical computations are performed to compare with the experimental results.
Experimental and Numerical Investigations of Transient Natural Convection in Differentially Heated Air-Filled Tall Cavity
doi:10.11648/j.ajme.20150102.12
American Journal of Modern Energy
2015-07-02
© Science Publishing Group
Lioua Kolsi
Mohamed Bechir Ben Hamida
Walid Hassen
Ahmed Kadhim Hussein
Mohamed Naceur Borjini
S. Sivasankaran
Suvash C. Saha
Mohamed M. Awad
Farshid Fathinia
Habib Ben Aissia
Experimental and Numerical Investigations of Transient Natural Convection in Differentially Heated Air-Filled Tall Cavity
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43
43
2015-07-02
2015-07-02
10.11648/j.ajme.20150102.12
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150102.12
© Science Publishing Group
Numerical Study of Combined Natural Convection and Radiation in Three Dimensional Solar Thermal Collector: Focus on the Inclination Effect on Heat Transfer
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150102.13
This paper studies the effect of the combined natural convection and radiation on the heat transfer and this, in an inclined solar thermal collector. A 3D numerical code is developed to solve respectively the convection equations according to the vorticity-vector potential formulation and the radiation equation. The discretize schema is the control volume method for the convection and the FTnFVM for the radiative equation. Numerical solutions are obtained for Pr=0.71, Ra=105, and the radiation-conduction parameter (rc) ranging from 0 to ∞. The medium is considered as gray. Indeed, it emits and absorbs heat.
This paper studies the effect of the combined natural convection and radiation on the heat transfer and this, in an inclined solar thermal collector. A 3D numerical code is developed to solve respectively the convection equations according to the vorticity-vector potential formulation and the radiation equation. The discretize schema is the control volume method for the convection and the FTnFVM for the radiative equation. Numerical solutions are obtained for Pr=0.71, Ra=105, and the radiation-conduction parameter (rc) ranging from 0 to ∞. The medium is considered as gray. Indeed, it emits and absorbs heat.
Numerical Study of Combined Natural Convection and Radiation in Three Dimensional Solar Thermal Collector: Focus on the Inclination Effect on Heat Transfer
doi:10.11648/j.ajme.20150102.13
American Journal of Modern Energy
2015-08-14
© Science Publishing Group
Kaouther Ghachem
Mohamed Bechir Ben Hamida
Chamseddine Maatki
Lioua Kolsi
Mohamed Naceur Borjini
Habib Ben Aissia
Numerical Study of Combined Natural Convection and Radiation in Three Dimensional Solar Thermal Collector: Focus on the Inclination Effect on Heat Transfer
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2
51
51
2015-08-14
2015-08-14
10.11648/j.ajme.20150102.13
http://www.sciencepublishinggroup.com/journal/paperinfo.aspx?journalid=363&doi=10.11648/j.ajme.20150102.13
© Science Publishing Group