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B. Vidya Sagar , M.C. Raju , S.V.K. Varma , S. Venkataramana (2014). Unsteady MHD Free Convection Boundary Layer Flow of Radiation Absorbing Kuvshinski Fluid through Porous Medium. Review of Advances in Physics Theories and Applications, 1(2): 48-62. DOI: 10.18488/journal.75/2014.1.2/188.8.131.52
An analytical study is carried out for an unsteady MHD two dimensional free convection flow of a viscous, incompressible, radiating, chemically reacting and radiation absorbing Kuvshinski fluid through a porous medium past a semi-infinite vertical plate. The dimensionless equations governing the flow are solved by simple perturbation technique. The expressions for velocity, temperature and concentration are derived. The influence of various material parameters on flow quantities are studied and discussed with the help of graphs. The expressions for Skin friction, Nusselt number and Sherwood number are also derived and discussed numerically. Temperature increases with an increase in radiation parameter and radiation absorption parameter where as it decreases with an increase in Prandtl number. Concentration is observed to be decreased when chemical reaction parameter and Schmidt number increase.
This study contributes in the existing literature of Newtonian fluids. Most of the practical problems involve non-Newtonian fluids type. This study uses new estimation methodology of analyzing the heat transfer characteristics of non-Newtonian fluid. This study originates new formula of solving nonlinear governing equations using perturbation method. This study is one of very few studies which have investigated on the heat and mass transfer characteristics of a well-known non-Newtonian fluid Kuvshinski fluid in the presence of uniform magnetic field. The paper’s primary contribution is finding that effects of various physical parameters on the flow quantities. This study documents a well-known non Newtonian fluid namely Kuvshinski fluid in the presence of thermal radiation, radiation absorption and chemical reaction of first order.
Thermodynamics Properties of Copper Halide Alloy (CuBr0.5Cl0.5)
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Elnaz Parham , Ali Mokhtari (2014). Thermodynamics Properties of Copper Halide Alloy (CuBr0.5Cl0.5). Review of Advances in Physics Theories and Applications, 1(2): 42-47. DOI: 10.18488/journal.75/2014.1.2/184.108.40.206
Ab initio density functional theory (DFT) has been used to investigate the thermal properties of the CuBr0.5Cl0.5 alloys over a wide range of temperature. Using the quasiharmonic approximation (QHA) for the some physical quantities of interest such as heat capacity at constant volume and entropy are calculated and discussed. The theoretical results show good agreement with the available experimental data for CuBr and CuCl. The present results show that symmetric and asymmetric structure of CuBr0.5Cl0.5 have a good agreement with the calculatingly value for heat capacity.