LAMINAR NATURAL CONVECTION HEAT TRANSFER IN A HORIZONTAL CAVITY WITH DIFFERENT END TEMPERATURES.
The heat transfer by free convection in a horizontal cavity with adiabatic horizontal walls and differentially heated end walls is studied analytically. The paper develops three models for explaining and predicting the heat transfer mechanism in a cavity with the height/length aspect ratio considerably smaller than one. The three models are: the regime of vanishing Rayleigh numbers; the intermediate regime; and the boundary layer regime. The transition from one model to the next occurs as the Rayleigh number increases. The Nusselt number prediction based on the three-regime theory agrees very well with available numerical and experimental heat transfer data.