Open Access Original Research Article

Effects of MHD Thermal Radiation and Heat Source of Viscous Flow over a Nonlinearly Stretching Sheet with Viscous Dissipation

Shiva Prasad Rayapole, Anand Rao Jakkula

Physical Science International Journal, Page 1-10
DOI: 10.9734/PSIJ/2017/32824

This investigation is undertaken to study effects of MHD thermal radiation and heat source of viscous flow over a nonlinearly stretching sheet with viscous dissipation. The governing equations of the problem are transformed into non-linear ordinary differential equations by using similarity transformations. The resulting equations are solved numerically by using an implicit finite difference method known as Keller box method. The effect of various physical parameters on the temperature, vertical velocity field and skin - friction and they are presented graphically for different values of physical parameters involved. The present result is in good agreement with the earlier published result in a particular case. Numerical results for local skin-friction, local Nusselt number are tabulated for various physical parameters. The nature of velocity and temperature has presented. It is found that Radiation parameter increases and the heat source/sink decreases with the influence of temperature.

 

Open Access Original Research Article

Approximation of the Dew Point Temperature Using a Cost Effective Weather Monitoring System

E. Ukhurebor Kingsley, O. Azi Samuel, C. Abiodun Isaac, Enoyoze Esosa

Physical Science International Journal, Page 1-6
DOI: 10.9734/PSIJ/2017/32862

In this era of global warming, research in weather measurement and prognostications are becoming more and more pertinent; getting the latest weather information and taking the necessary precautions have become a major issue all over the world. Dew point temperature is an important weather parameter that is used in estimating rain, snow, dew, evapotranspiration, near-surface humidity, other meteorological parameters and applications. This research is aimed at approximating the dew point temperature (using a self designed cost effective weather monitoring system) from the measured temperature and relative humidity. The results from this research show that the temperature and relative humidity have a significant influence on the dew point temperature and it was in good conformity with data obtained from other sources. Thus, this study would help in mitigating climate-induced environmental disasters and also improve agricultural productivity.

Open Access Original Research Article

Variability of Microwave Radio Refractivity and Field Strength over Some Selected Locations in Nigeria

Adekunle Titus Adediji, Samuel Oluwadare Adebusola, Joseph Sunday Ojo

Physical Science International Journal, Page 1-11
DOI: 10.9734/PSIJ/2017/33447

In this study, results of the variation of radio field strength derived from the computation of surface refractivity through measurements of temperature, relative humidity and pressure across seven locations ((Akure (7.15°N, 5.12°E), Lagos (6.30°N, 3.20°E), Abuja (7.10°N, 9.25°E), Jos (9.50°N, 8.50°E), Makurdi (7.30°N, 8.53°E), Port-Harcourt (4.20°N, 7.00°E), and Nsukka (6.90°N, 7.67°E)) in Nigeria are presented. Two years (Jan., 2011–Dec., 2012) archived data as provided by Tropospheric Data Acquisition Network (TRODAN) of the Centre for Atmospheric Research, Anyigba, Kogi State were utilized for the study. Results showed that the values of surface refractivity (Ns) were low during the dry season months and high during the wet season months and also there was high values of NS at the coastal areas compared with the inland areas. It was also deduced that the average value of NS for Abuja, Akure, Jos, Lagos, Markurdi, Nsukka and Port-Harcourt is 355, 362, 303, 391, 375, 361 and 399 N-units respectively. Also the average values of Field Strength Variability (FSV) are 30.38, 20.16, 21.39, 24.21, 24.31, 21.49, and 21.48 dB in the respective locations and that the FSV values were high during the dry season months and low during the wet season months. This may be attributed to the prevalence of high temperature during dry season and low temperature during the wet season.

 

Open Access Original Research Article

Design and Development of an Improved Palm Kernel Shelling Machine and Separator

I. T. Adejugbe, O. A. Oyegunwa, D. D. Iliya, J. O. Aigbogun, A. T. Oyelami, S. O. O. Olusunle

Physical Science International Journal, Page 1-9
DOI: 10.9734/PSIJ/2017/26627

A palm kernel processing (Cracking and Separating) unit was developed to crack effectively various sizes/diameters of palm kernel as well as to separate the palm kernel from the shell with the aim of reducing the challenges encountered during the production of palm kernel Oil. This machine was fabricated and designed with locally available materials for the ease of maintenance and it was designed the the aims of easing the pain, stress involved, intensive labour, time consuming, unduly cost and cumbersome operation encountered in the traditional/existing process of manually cracking and separating palm kernel from the nut. After the fabrication of this machine, the machine was tested to ascertain its performance and efficiency. The efficiency of the machine was discovered to be 98% with a processing rate of 95 nuts per second. This is an improvement over existing ordinary palm kernel machine that has an efficiency of 90% with a processing rate of 87 nuts per second wiithout separation. A 5 hp Prime mover was selcted based on the power that was needed to effectively operate the machine. This project has catered for the various challenges encountered in the manual process of shelling palm kernel and separating the kernel from the shell.

 

Open Access Original Research Article

Corrosion Inhibition of Mild Steel and Aluminium in 1 M Hydrochloric Acid by Leaves Extracts of Ficus sycomorus

K. D. Ogwo, J. C. Osuwa, I. E. Udoinyang, L. A. Nnanna

Physical Science International Journal, Page 1-10
DOI: 10.9734/PSIJ/2017/32708

Inhibitory effects of Ficus sycomorus leaves extracts on the corrosion of mild steel and aluminium in 1 M hydrochloric acid (HCl) solution was studied at temperature of 30°C using gravimetric technique. Corrosion rates of mild steel and aluminium in the aggressive medium were found to increase as temperature increased, but decreased upon the addition of leaves extract of Ficus sycomorus compared to the blank. At 30°C, the inhibition efficiency increased with increase in inhibitor concentration reaching 87.84% for mild steel and 98.92% for Aluminium in the presence of 5 g/L of Ficus sycomorus leaves extracts. The results obtained show that aluminium had correlation coefficients (R2) of 0.999 and 0.876 for Langmuir and Temkin isotherms respectively while Mild steel had correlation coefficients of 0.989 and 0.751 for Langmuir and Temkin isotherms respectively. However, the inhibitor adsorption was found to fit Langmuir adsorption isotherm better than Temkin isotherm. The free energy of adsorption (∆G°ads) has negative values and this indicates that the adsorption of Ficus sycomorus on the metal surface follows a spontaneous process.