MIXED CONVECTION AND CONDUCTION HEAT-TRANSFER IN OPEN CAVITIES

A numerical study has been carried out on mixed convection and conduct ion in open cavities. The study covers the Rayleigh number from to to 10(6), the Reynolds number from 1 to 10(3) and k(r) = k(w)/k(a) from 1 to 1oo for Pr = 0.72 (air) and cavity aspect ratio B from 0.8 to 1.3. The flow is assumed to be laminar and two-dimensional. The density va riation is taken into account by the Boussinesq approximation. The con trol-volume approach is used for solving the governing equations of co njugate heat transfer involving conduction in the walls. Streamlines a nd isotherms in the system are produced and the results are represente d in terms of the Nusselt number as function of other parameters. Corr elations are derived to calculate heat transfer through the cavity ope nings.