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Abstrakty
The present investigation deals with the combined heat and mass transfer with the effects of thermal dispersion, radiation on non-Darcy natural convection in a fluid saturated porous medium with thermophoresis. The goveming equations, reduced to local similarity boundary layer equations using suitable transformations are obtained. Forchheimer extension is considered in the fIow equations. The coefficient of thermal diffusivity has been assumed to be the sum of molecular diffusivity and the dispersion thermal diffusivity due to mechanical dispersion. Rosseland approximation is used to describe the radiative heat fIux in the energy equation. For the fluids having the Lewis number Le=l.O, 10.0, numerical values of the local Stanton number are presented in a tabular form for different values of the thermophoretic parameter [...], thermal dispersion and thermal radiation for the two cases of Darcy and non-Darcy porous medium. The concentration distributions are show n graphically for various values of the thermophoretic parameter, thermal dispersion and thermal radiation.
Rocznik
Tom
Strony
9--18
Opis fizyczny
Bibliogr. 15 poz., tab., wykr.
Twórcy
autor
autor
autor
- Department of Mathematics, South Valley University Faculty of Science Aswan, EGYPT, ahmedrashad12@yahoo.com
Bibliografia
- Batchelor G.K. and Shen C. (1985): Thermophoretic deposition of particles in gas flowing over cold surfaces. - J. Colloid Interface Sci., vol.107, pp.21-37.
- Chamkha Ali J. and Pop I. (2004): Effect of thermophoresis particle deposition in free convection boundary layer from a vertical flat plate embedded in a porous medium. - Int. Comm. Heat Mass Transfer, vol.31, pp.421-430.
- Cheng P. (1981): Thermal dispersion effects on non-Darcy convection flows in a saturated porous medium. - Lett. Heat Mass Transfer, vol.8, pp.267-270.
- Gokoglu S.A. and Rosner D.E. (1984): Correlation of thermophoretically-modified small particle diffusional deposition rates in forced convection systems with variable properties, transpiration cooling and viscous dissipation. - Internat. J. Heat Mass Transfer, vol.27, pp.639-646.
- Goldsmith P. and May F.G. (1966): Diffusiophoresis and thermophorsis in water vapour systems. - in: C.N. Davies (Ed.), Aerosol Science, Academic Press, London, pp.163-194.
- Goren Simon L. (1977): Thermophoresis of aerosol particles in the laminar boundary layer on a flat plate. - J. Colloid Interface Sci., vol.61, pp.77-85.
- Hales J.M., Schwendiman L.C. and Horst T.W. (1972): Aerosol transport in a naturally-convected boundary layer. - Internat. J. Heat Mass Transfer, vol.15, pp.1837-1849.
- Lai F.C. and Kulacki F.A. (1989): Thermal dispersion effect on non-Darcy convection from horizontal surface in saturated porous media. - Internat. J. Heat Mass Transfer, vol.32, pp.971-976.
- Mills A.F., Hang X. and Ayazi F. (1984): The effect of wall suction and thermophoresis on aerosol-particle deposition from a laminar boundary layer on a flat-plate. - Internat. J. Heat Mass Transfer, vol.27, pp.1110-1113.
- Murthy P.V.S.N. and Singh P. (1997): Thermal dispersion effects on non-Darcy natural convection with lateral mass flux. - Heat and Mass Transfer, vol.33, pp.1-5.
- Plumb O. (1983): The effect of thermal dispersion on heat transfer in packed bed boundary layers. - Proc. First ASME Thermal Eng. Joint Conference, vol.2, pp.17-21.
- Selim A., Hossain M.A. and Rees D.A.S (2003): The effect of surface mass transfer on mixed convection flow past a heated vertical flat permeable plate with thermophorresis. - Internat. J. Thermal Sci., vol.42, pp.973-982.
- Sparrow E.M. and Cess R.D. (1978): Radiation Heat Transfer, Chapters 7 and 10. - Augmented edition, Hemisphere Publ. Washington, D.C.
- Talbot L., Chenge R.K., Schefer A.W. and Willis D.R. (1980): Thermophoresis of particles in a heated boundary layer. - J. Fluid Mech., vol.101, pp.737-758.
- Tsai R. (1999): A simple approach for evaluating the effect of wall suction and thermophoresis on aerosol particle deposition from a laminar flow over a flat plate. - Internat. Commun. Heat Mass Transfer, vol.26, pp.249-257.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPZ2-0028-0002