Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2006.1426.1436AbdellahBelkacemRebhi MebroukDraoui BelkacemChikh Salah7200667In this study, a numerical study of laminar natural convection flow of air in a vertical channel with only one sinusoidal obstruction is performed. The wall containing the obstruction is assumed to be heated while the other wall is assumed to be adiabatic (asymmetric heating). The governing elliptic equations are discretized in a two dimensional domain using the finite-volume method with non-staggered variable arrangement and the PISO algorithm for the velocity-pressure coupling is employed. Simulation was carried out for a range of amplitude of the sinusoidal obstruction a = 0.0-0.5, aspect ratio A = 5, channel Rayleigh number Ra^{*} = 10^{2} to 2.10^{5} for a fluid having Prandtl number equal to 0.71. Streamlines and isothermal lines represent the corresponding flow and thermal fields. Local and global Nusselt number distributions express the rate of heat transfer.]]>Aihara, T.,1973Akbari, H.T. and R. Borges,1979Aung, W., 1972Aung, W., L.S. Fletcher and V. Sernas,1972Aung, W. and G. Worku, 1986Aung, W. and G. Worku,1986Azevedo, L.F.A. and E.M. Sparrow,1986Bar-Cohen, A. and W.M. Rohsenow,1984Bodia, J.R. and J.F. Osterle, 1962Dalbert, A.M., J.L. Peupe, F. Penot and J.F. Robert,1980Dalbert, A.M., F. Penot and J.L. Peube,1981Desrayaud, G. and A. Fichera, 2002Dyer, J.R. and J.H. Fowler,1966Dyer, J.R., 1975Dyer, J.R., 1978Elenbaas, W., 1942Habchi, S. and S.S. Acharrya, 1986Hadjadj, A. and M.E. Kyal,1999Issa, R.I., 1985Issa, R.I., B. Ahmadi-Befrui, K.R. Beshay and A.D. Gosman, 1991Kettleborough, C.F.1972Marcondes, F. and C.R. Maliska,1999Mehrotra, A. and S. Acharya, 1993Miyatake, O. and M. Fujii,1972Nakamura, H., Y. Asako and T. Naitou,1982Naylor, D., J.M. Floryan and J.D. Tarasuk,1991Patankar, S.V., 1980Penot, F. and A.M. Dalbert, 1983Said, S.A.M. and R.J. Krane, 1990Sparrow, E.M. and W.Q. Tao, 1982Sparrow, E.M., G.M. Chrysler and L.F.A. Azevedo,1984Sparrow, E.M. and L.F. Azevedo, 1985Viswatmula, P. and M.R. Amin, 1995Webb, B.W. and D.P. Hill, 1989Wirtz, R.A. and R.J. Stutzman, 1982