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Chemically reacting ionized radiative fluid flow through an impulsively started vertical plate with induced magnetic field

100%

Ahmed T. , Alam M. M. , Ferdows M. , Tzirtzilakis E. E.

International Journal of Applied Mechanics and Engineering

2019

tom Vol. 24, no. 1

5--36

Numerical studies have been performed to examine the chemically reacting ionized fluid flow through a vertical plate with induced magnetic field. This study is performed for the cooling problem. To obtain the nondimensional non-similar momentum, the induced magnetic field, energy and concentration equations, usual nondimensional variables have been used. The numerical solutions for the velocity fields, induced magnetic fields, temperature distribution as well as concentration distribution are obtained for associated parameters using the explicit finite difference method. The local and average shear stresses, current densities, Nusselt number as well as the Sherwood number are also investigated. The obtained results are discussed with the help of graphs to observe effects of various parameters entering into the problem. Also the stability conditions of the explicit finite difference method are analyzed. Finally, a qualitative comparison of the present results with previously published results has been made.

Characterization of phosphorus in fresh and composted manures of different Livestock

75%

Faridullah F. , Hafeez S. , Ahmed T. , Alam S. , Naz A. , Shah W. , Khalid S.

Polish Journal of Environmental Studies

2018

tom 27

nr 2

The characterization of phosphorous (P) from animal manure is important for sustainable nutrient management. P fractions in fresh and composted animal manure was compared for the release of phosphorous fraction to determine heavy metals (Fe, Zn, Mn, Ni, and Hg). Composted and fresh animal manure were collected from four different sources: buffalo (BF), cow (CW), goat (GT), and poultry (PL). The P fraction was determined by using the Hadley sequential fractionation method. The P was step-wise fractionated into water-soluble extracted P (H₂O-P), plant available (NaHCO₃-P), Al associated (NaOH-P), and Ca associated (HCl-P). The overall P fractions extracted by reagents varied in the order HCl > NaOH > NaHCO₃ > H₂O. The metal concentration varied as follows: Fe > Hg > Mn > Zn > Ni. The highest P content was found in composted PL manure whereas the minimum was observed in fresh PL. Consequently, the composed animal manure could be an economical P source to be used as fertilizer.