The effect of thermal boundary conditions on local features of low-intensity natural convection in a square enclosure

Local features are investigated of heat transfer and thermal stratification under conditions of weakened natural convection in a square enclosure. The dependence of local effects on the type of thermal conditions on horizontal boundaries is studied. Conditions of two types are employed, namely, a uniform heat flux (or efflux) and the general condition of heat transfer. Estimates are given of the limits of modes of convection, and the dependences of temperature fields and heat fluxes on criterional numbers are obtained.