Open Access Commentary

Critical Comment on the Paper “Some of the Complexities in the Special Relativity: New Paradoxes”

Vladimir A. Leus

Physical Science International Journal, Page 1-5
DOI: 10.9734/PSIJ/2016/28188

Special Relativity, which the 110-anniversary was marked in the last year, is a very well elaborated theory. However, there might be some logically deduced discrepancies named paradoxes, which demand a painstaking examination. Nonetheless, every search for inherent contradictions is an uphill task. The authors of the considered paper proposed a situation with two coevals, believed to be contradictory, but the relevant mathematical analysis proves that it is none other than a pseudo-paradox, as well as several others. 

 

Open Access Original Research Article

A Hydrodynamic Model of Flow in a Bifurcating Stream, Part 1: Effects of Bifurcation Angle and Magnetic Field

W. I. A. Okuyade, T. M. Abbey

Physical Science International Journal, Page 1-13
DOI: 10.9734/PSIJ/2016/26410

A hydrodynamic model of the flow in a bifurcating stream is presented. The problem is modeled using the Boussinesq approximations, and the governing nonlinear equations solved analytically by the methods of similarity transformation and regular perturbation series expansions. Similarity expressions for the temperature, concentration and velocity are obtained and analyzed graphically. The results show that bifurcation angle and Reynolds number increase the transport velocity. Furthermore, it is seen that the magnetic field parameter decreases the velocity in the upstream region, and makes it oscillatory in the downstream region. 

 

Open Access Original Research Article

DFT Calculations of Mesembryanthemum nodiflorum Compounds as Corrosion Inhibitors of Aluminum

Ghassab M. Al-Mazaideh, Taher S. Ababneh, Khalid H. Abu-Shandi, Rasheed M. A. Q. Jamhour, Haya J. Ayaal Salman, Ashraf M. Al-Msiedeen, Salim M. Khalil

Physical Science International Journal, Page 1-7
DOI: 10.9734/PSIJ/2016/28273

Density functional theory (DFT) calculations have been performed on Mesembrine, Mesembrenone, Mesembrenol and Tortuosamine, using Gaussian 03 (G03) program with complete optimization of geometries. Quantum parameters and thermodynamic Gibbs function have been used to investigate the efficiency of the corrosion inhibition of each compound. Mesembrenone has been found to have very good corrosion inhibition efficiency as compared to the other compounds. Quantum parameters and frontier orbitals together with calculated thermodynamic function △G for adsorption show spontaneous physical adsorption of the Mesembrenone on aluminum.

 

Open Access Original Research Article

Determining Global Solar Radiation Incident on Tilted Surfaces with Different Tilt Angles at the Department of Physics Makerere University

Kirya Robert Kent, E. J. K. B. Banda, Kodi Phillip

Physical Science International Journal, Page 1-19
DOI: 10.9734/PSIJ/2016/28829

Solar radiation data at horizontal level, tilted surfaces and in the atmosphere is an important feature in solar energy applications such as photovoltaic systems for electricity generation, solar collectors for heating and passive solar devices. This study presents an investigation of the dependence of global solar radiation incident on a tilted surface on some meteorological parameters for different tilt angles based on measured meteorological data of sunshine hours, relative humidity and temperature at Makerere University. Empirical models relating global solar radiation on tilted surfaces and meteorological data were formulated using data of six months. The empirical model for the estimation of daily global solar radiation on the tilted surfaces of 150, 22.50 and 300, whose assessment is based on the statistical analysis with the Mean Bias and Root Mean Square difference that is in good agreement with the measured data on a tilted surface is equation 12. The model yielded a RMSE of 4.2654, with a low correlation coefficient of 0.3743 at a 95% confidence interval and MBE of 1.5801. Analysis of data for global solar radiation data attained over a period of 3 years, towards the verification of Akoba’s model [15] at a tilt angle of 22.50 recommends a new model given in equation 13 that capitulated a RMSE of 2.5985, with a correlation coefficient of 0.8863 at a 95% confidence interval and MBE of 2.3391.

 

Open Access Original Research Article

Construction of a Simple Transformer to Illustrate Faraday’s Law of Electromagnetic Induction along Side Mutual Inductance

K. O. Rauff, Aliyu Rilwan, U. Abubakar Farouk, D. Dogo Joshua

Physical Science International Journal, Page 1-5
DOI: 10.9734/PSIJ/2016/28280

The concept of mutual induction which arises from Faraday’s law of electromagnetic induction is a major concerned about the size of the magnetic flux cutting across a wire which is directly proportional to the induced Electromotive Force (e.m.f.), this is often time being thought without reference to a physical device. The methodology employed includes the construction and testing of a simple device called transformer. This device is made up of copper wire, thin insulated iron, output display meter, switch, fuse, simple handle and structural wooden case. With this device, an experiment is conducted to illustrate Faraday’s law of electromagnetism. This work presents a suitable reproducible device for illustrating mutual induction of a coil. Using an analytical approach, the result obtained signified a step-down transformer. Base on the output result, the transformer can function effectively to give a low voltage output to electrical gadgets.

 

Open Access Original Research Article

MHD Mixed Convection Flow of a Nanofluid over a Nonlinear Stretching Sheet with Variable Brownian and Thermophoretic Diffusion Coefficient

Chenna Sumalatha, Bandari Shanker

Physical Science International Journal, Page 1-10
DOI: 10.9734/PSIJ/2016/28946

Investigation has been carried out to analyze the effects of variable wall temperature and concentration on Magnetohydrodynamic mixed convection flow of a nanofluid over a nonlinear stretching sheet with variable Brownian and thermophoretic diffusion coefficient. The governing differential equations were transformed into a set of non-linear coupled ordinary differential equations using similarity transformations. Results are shown graphically for the velocity profile, the temperature profile, and the concentration profile with different values of physical parameters like suction parameter, magnetic parameter, Grashof number, local modified Grashof number, thermal diffusivity, Prandtl number, Lewis number, the thermophoresis parameter and the Brownian motion parameter, the variable thermophoretic diffusion coefficient parameter and the variable Brownian motion diffusion coefficient parameter. A comparison with previously published work has been carried out and the results are found to be in good agreement. Finally, numerical values of pertinent physical quantities, such as the local Nusselt and local Sherwood numbers were presented graphically. It is found that Heat transfer rate decreases with the influence of Brownian motion and thermophoresis parameters and the local Sherwood number increases with the effect of both Brownian motion and thermophoresis parameters.

 

Open Access Original Research Article

Chemical Reaction and Radiative MHD Heat and Mass Transfer Flow with Temperature Dependent Viscosity Past an Isothermal Oscillating Cylinder

R. Ahmed, B. M. Jewel Rana, R. Uddin, M. M. Islam, S. F. Ahmmed

Physical Science International Journal, Page 1-9
DOI: 10.9734/PSIJ/2016/28008

The numerical analysis is performed to examine the effects of magnetic, radiation and chemical reaction parameters on the unsteady heat and mass transfer flow past a temperature dependent viscosity of an isothermal oscillating cylinder. The governing coupled dimensional partial differential equations have been transformed into dimensionless equations by using non-dimensionless variables. The transformed momentum, energy and concentration equations are solved numerically by using explicit finite difference method. A Compaq visual Fortran 6.6a has been used to calculate the numerical solutions of this present problem. The velocity, temperature, concentration field, skin-friction, rate of heat transfer, streamlines and isotherms lines for different well-known parameters entering into the problem separately are discussed with the help of graphs.