Thermo diffusion and chemical effects with simultaneous thermal and mass diffusion in mixed convection flow with Ohmic heating

• Autorzy: Reddy N. A. , Varma S. V. K.
• Języki publikacji: EN

Abstrakty

EN

Thermo diffusion and chemical effects on heat transfer in mixed convection flow and mass transfer past an infinite vertical plate with Ohmic heating and viscous dissipation are discussed. Approximate solutions are derived for velocity, temperature, concentration profiles, skin friction, the rate of heat transfer and rate of mass transfer using perturbation technique. The results are discussed with the help of graphs to observe the effect of various parameters like the Schmidt number (Sc), Prandtl number (Pr), Soret number (So) and the chemical parameter (K), taking two cases viz. Case I: when Gr > 0 (flow on a cooled plate) and Case II: Gr < 0 (flow on a heated plate). Thermal diffusion causes both the fluid velocity and temperature to fall due to the presence of the chemical effect. Velocity and temperature profiles are higher for mercury than an electrolytic solution. The Soret effect increased the concentration of the fluid while the chemical effect decreased it.

Słowa kluczowe

EN

chemical effect; thermo diffusion and heat-mass transfer

PL

działanie chemiczne; przepływ ciepła

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2011
• Tom: Vol. 16, no 2
• Strony: 509--519
• Opis fizyczny: Bibliogr. 14 poz., tab., wykr.

Twórcy

autor

Reddy N. A.

autor

Varma S. V. K.

• Department of Mathematics, A.I.T.S. Rajampet, Kadapa, A.P. - 516126, INDIA,

Bibliografia

• Alam M.S., Rahman M.M and Sattar M.A. (2007): Effects of thermophoresis and chemical reaction on unsteady hydro magnetic free convection and mass transfer flow past an impulsively started infinite inclined porous plate in the presence of heat generation/absorption. - Thammasat Int. J. Sc. Tech., vol.12, No.3, pp.44.
• Chamber P.L. and Young L.D. (1958): On the diffusion of a chemically reactive species in a laminar boundary layer flow. - The Physics of Fluids, vol.1, No.1, pp.48-54.
• Das U.N., Deka R.K. and Soundalgekar V.M. (1999): Effects of mass transfer on flow past an impulsively started infinite vertical plate with chemical reaction. - The Bulletin of GUMA, vol.5, pp.13-20.
• Elbashbeshy E.M.A. (1997): Heat and mass transfer along a vertical plate with variable temperature and concentration in the presence of magnetic field. - Int. Journal of Eng. Sci., vol.34, p.515.
• Gebhart B. and Pera L. (1971): The nature of vertical convection flows resulting from combined buoyancy effects of the thermal and mass diffusion nature. - International Journal of Heat and Mass Transfer, vol.14, p.2025.
• Georgantopoulos G.A. (1979): Effects of free convection on the hydro magnetic accelerated flow past a vertical porous limiting surface. - Astrophysics and Space Science, vol.65, p.433.
• Kafoussias N.G. (1992): MHD thermal diffusion effects on free convective and mass transfer flow over an infinite vertical moving plate. - Astrophysics and space science, vol.192, pp.11.
• Kafoussias N.G. and Williams E.M. (1995): Thermal-diffusion and diffusion-thermo effects on mixed free-forced convective and mass transfer boundary layer flow with temperature dependent. - International Journal of Engineering Science, vol.33, pp.1369.
• Lin H.T. and Wu.C.M. (1995): Combined heat and mass transfer by laminar natural convection from a vertical plate. - Heat and Mass Transfer, vol.30, p.369.
• Muthucumaraswamy R. and Ganesan P. (2002): Natural convection on a moving isothermal vertical plate with chemical reaction. - J. of Engineering Physics and Thermophysics, vol.75, No.1.
• Muthucumaraswamy R, Maheswari J. and Pandurangan J. (2008): Unsteady MHD flow past an impulsively started semi-infinite vertical plate in the presence of chemical reaction. - International Review of Pure and Applied Mathematics, vol.4, No.1, p.119.
• Nazmul Islam and Mahmud Alam Md. (2007): Dufour and Soret effects on steady MHD free convection and mass transfer fluid flow through a porous medium in a rotating system. - J. of Naval Architecture and Marine Engineering, vol.4, pp.43-55.
• Somess E.V. (1956): Theoretical consideration of combined thermal and mass transfer from a vertical flat plate. - ASME, J. Appl. Mech., vol.23, p.295.
• Soundalgekar V.M and Ganesan P. (1981): Finite difference analysis of transient free convection with mass transfer as an isothermal flat plate. - Int. J. Engg. Science, vol.19, p.757.