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Choudhury, Rita
- Visco-elastic Flow with Heat and Mass Transfer Past a Vertical Porous Plate in Presence of Hall Current and Radiation
Authors
1 Department of Mathematics, Gauhati University, Guwahati-781014, IN
Source
International Journal of Fluids Engineering, Vol 5, No 1 (2013), Pagination: 39-55Abstract
The effects of Hall current and radiation on unsteady MHD free convective visco-elastic flow past an infinite vertical porous plate in presence of heat and mass transfer subjected to wall slip condition have been analyzed analytically. The highly non-linear equations are solved analytically by using multi parameter perturbation technique. The expressions for velocity field, temperature field, shearing stress and rate of heat transfer as well as mass transfer have been obtained. To study the visco-elastic effects with the combination of other flow parameters, the velocity and shearing stress have been illustrated graphically with physical interpretation.Keywords
Free Convection, Radiation, Perturbation Scheme, Walters Liquid (model B’).
References
- Sato H., J. Phys. Soc. Japan, Vol.16, pp1427, 1961.
- Sherman A. and Sutton G.W., Engineering magnetohydrodynamic, New York, McGraw-Hill, 1965.
- Beard D.W. & Walters K, Pro Cambridge Philo Soc. Math Phys Sci, Vol.60, pp 667, 1964.
- Katagiri M.J., Phys Soc Japan, Vol.27, pp 1051, 1969.
- Pop I., J. Math. Phys. Sci., Vol.5, pp 375, 1971
- Raptis A., Ram P.C., Astrophys. Space Sci., Vol.106, pp 257, 1984
- Attia H.A., Canadian J. Phys, Vol.76 (9), pp 739, 1998.
- Biswal S., Sahoo P.K., Proc. Natl. Acad. Sci India, Vol. 69 A (1), 45-57, 1999
- Takhar H.S., Chamkha A.J., Nath G., Int. J. Eng. Sci. Vol. 40,pp 1511, 2002.
- Attia H.A., Canadian J. Phys, Vol. 82(2), pp 127. 2004.
- Kumar R., Chand K., Int. J. Eng. Sc. Tech., Vol.3(4), pp 3124,2011.
- Singh K.D., Kumar R., Int. J. Appl. Maths. Mech., Vol. 6 (13), pp 28,2010.
- Raju M.C., Reddy N.A., Verma S.V.K., thermal science, Vol. 15(2),pp 527, 2011.
- Ahmed N., Kalita D., J. Energy Heat mass transfer, Vol.33, pp 271-29, 2011.
- Choudhury R., Das S.K., IOSR Journal of Mathematics, Vol. 5(1), pp 20, 2013.
- Mixed Convective Elastico-Viscous Fluid Flow Past a Porous Plate in Presence of Induced Magnetic Field and Energy Dissipations
Authors
1 Department of Mathematics, Gauhati University, Guwahati-781 014 Assam, IN
2 Department of Mathematics, Royal School of Engineering and Technology, Guwahati-781 035 Assam, IN
3 Department of Mathematics, Dibrugarh University, Dibrugarh-786 004 Assam, IN
Source
Research Journal of Science and Technology, Vol 7, No 3 (2015), Pagination: 165-175Abstract
A mixed convective hydro-magnetic flow of visco-elastic fluid past an infinite vertical porous surface with constant suction has been investigated in presence of heat and mass transfer. Visco-elastic fluid flow is characterized by Walters liquid (Model B') for short relaxation memories. A magnetic field of strength B0 is applied along the transverse direction to the surface. To study the governing fluid motion, we have considered the effects of induced magnetic field and magnetic dissipations of energy. Mechanism of heat transfer arises from mixed convection along with dissipation of energy due to viscosity. Let Tw and Cw be respectively the temperature and the molar species concentration of the fluid at the surface. To solve the governing equations of motion, we have used multi-parameter perturbation scheme. Two non-dimensional numbers taken as perturbation parameters are Eckert number and visco-elastic parameter. The results are discussed graphically for the various values of elastico-viscous parameter along with other values of flow parameters involved in the solution.Keywords
Elastico-Viscous, Induced Magnetic Field, Perturbation Scheme, Current Density, Eckert Number, 2000 AMS Mathematics Subject Classification:, 76A05, 76A10.- Hydromagnetic Electrically Conducting Flow Past a Continuously Moving Inclined Plate with Heat and Mass Transfer
Authors
1 Department of Mathematics, Gauhati University, Guwahati-781014, Assam, IN
Source
International Journal of Technology, Vol 4, No 1 (2014), Pagination: 42-46Abstract
The hydromagnetic free convective fluid flow over a continuously moving inclined plate embedded on a porous medium has been investigated. The periodic transverse suction velocity is applied to the surface due to which the flow becomes unsteady. The visco-elastic fluid flow is characterized by Walters liquid (model B′). Analytical solution of the problem is obtained by using multi-parameter perturbation technique. The expressions for velocity field, temperature field, concentration field, shearing stress at the plate are derived analytically. The fluid velocity and shearing stress are illustrated graphically to observe the visco-elastic effects in combination with other flow parameters involved in the solution. Also the temperature and concentration fields are not significantly affected by the visco-elasticity in comparison with Newtonian fluid flow mechanism.
Keywords
Free Convection, Heat Source, Hydromagnetic Flow, Porous Medium, Suction.- Synthesis and Optical Property Studies of Undoped and Doped Zns (with Al & Ni) Nano-Particles
Authors
Source
International Journal of Innovative Research and Development, Vol 3, No 8 (2014), Pagination:Abstract
Undoped and doped Zinc Sulphide Nano particles with aluminium and nickel at different volume ratios using Polyvinyl alcohol matrix were synthesized by chemical route. These ZnS thin films posses a nanocrystalline structure, exhibit quantum size effects due to the small crystal size and produce a blue shift in the optical spectra. With the help of X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) Nanostructure is characterized. With the help of Scanning Electron Microscope (SEM) surface morphology is studied. We have prepared volume ratios of 5:2, 5:3 & 5:4 of ZnS, ZnS-Al and ZnS-Ni keeping pH = 1. In the volume ratio 5:2 absorption peak of undoped ZnS is found at 360 nm. After doping with Al the peak is found at 340 nm and doping with Ni it is found to be shifted to 290 nm. From PL studies excitation peaks of ZnS, ZnS-Al and ZnS-Ni are found at 540 nm, 510 nm and 460 nm. From UV and PL studies the effect of doping is well noticed and they support one another. But when volume ratios are changed to 5:3 and 5:4, no remarkable changes are noticed (from UV and PL studies). From TEM studies, average particle sizes of ZnS, ZnS-Al and ZnS-Ni are found to be 10.5 nm, 9.9 nm and 10.01 nm, and from XRD studies it is found to be 6.9 nm. SAED patterns show a set of three well-defined rings corresponding to diffraction from different planes of Nano crystallites of ZnS, ZnS- Al and ZnS- Ni. . X-ray Fluorescence studies show larger peak for Zn and S compared to dopant materials Al and Ni.
Keywords
Nano materials, XRD, XRF, SEM, TEM, PL, UV-VISFull Text
