Abstract

The thermal and fluid transport phenomena adjacent to a plane wall in a stable, thermally stratified saturated porous medium is investigated numerically and experimentally in the present work. Glass bead is taken as porous material with diameter (12mm). The temperature distribution and Nusselt number are discussed numerically (Fluent Program) and experimentally for different values of heat flux (150, 250, 500, 750, 1000, 1250 W/m2), thermal stratification (0,-0. 6,-0. 8,-1. 6,-2,-5,-10) and inclination angles (0,-15, 15, 30, 45deg). It is observed that the temperature distribution is affected strongly by thermal stratification where it increases when thermal stratification decreases and it is unaffected strongly by the inclination angles. Also the results show that the Nusselt number varies linearly with downstream coordinate (X) and increases with decreasing stratification parameter.

References

• NA, T. Y. and POP, I. 1983. Free Convection Flow past a Vertical Flat Plate Embedded in a Saturated Porous Medium, Int. J. Eng Sci, Vol. 21, No. 5, P. P. 517-526.
• Kaviany, M. and Mittal, M. 1986. Natural Convection Heat Transfer from a Vertical Plate to High Permeability Porous Media: an experiment and an approximate solution, Int. J. Heat and Mass transfer, Vol. 30, No. 5, P. P. 967-977.
• Beithou, N. , Albayrak, K. and Abdulmajeed, A. 1997. Effects of Porosity on the Free Convection Flow of Non-Newtonian Fluids along a Vertical Plate Embedded in a Porous Medium, Tr. J. of Engineering and Environmental Science, Vol. 22, P. P. 203-209.
• Saha, S. C. Akhter, C. and Hossain, M. A. 2004. Natural Convection from a Plane Vertical Porous Surface in Non-Isothermal Surroundings, Nonlinear Analysis: Modeling and Control, Vol. 9, No. 2, P. P. 151-170.
• Deka, R. K. and Neog, B. C. 2009. Unsteady Natural Convection Flow past an Accelerated Vertical Plate in a Thermally Stratified Fluid, Theoret. Appl. Mech. , Vol. 36, No. 4, p. p. 261-274.
• Saha, S. C. and Hossain, M. A. 2004 . Natural Convection Flow with Combined Buoyancy Effects due to Thermal and Mass Diffusion in a Thermally Stratified Media, Nonlinear Analysis: Modeling and Control, Vol. 9, No. 1, P. P. 89-102.
• Ahmed, T. E. 2005. Transient Natural convection Heat Transfer from a Plane Wall to a Thermally Stratified Media, M. Sc. Thesis, University of Technology, Baghdad.
• Naseem K. A. 2011. Experimental and Numerical Investigation of Natural Convection Heat Transfer from a Plane Wall to a Thermally Stratified Porous Media, MSc. Thesis, University of Baghdad.
• Mondal, H. K. and Chaudhury, T. K. 1991. Free Convection Flow of a Stratified Fluid through a Porous Medium Bounded by a Vertical Plane, Internat J. Math. Math . Sci. , Vol. 17, No. 3, P. P. 537-544.
• Angirasa, D. and Peterson, G. P. 1997. Natural Convection Heat Transfer from an Isothermal Vertical Surface to a Fluid Saturated Thermally Stratified Porous Medium, Int. Journal Heat Mass Transfer, Vol. 40, No. 18, P. P. 4329-4335.
• Kumar, B. V. and Shalini. 2003. Non-Darcy Free Convection Induced by a Vertical Wavy Surface in a Thermally Stratified Porous Medium, International journal of Heat and Mass transfer, Vol. 47, Issues 10-11, P. P. 2353-2363.
• Ching, Y. 2009. Combined Heat and Mass Transfer in Natural Convection Flow from a Vertical Wavy Surface in a Power-Law Fluid Saturated Porous Medium with Thermal and Mass Stratification, Int. communication in Heat and Mass transfer, Vol. 36, Issue 4, P. P. 351-356.