| In this thesis, the phenomenon of natural convection in cavities with localized heating is studied numerically.;The governing equations which are in vorticity-stream function form, are solved using the implicit ADI scheme.;The program used in this study has been tested with the benchmark solutions in the literature. The identical results obtained proved the validity of the code.;The problem of this study involves two types of parameters: the first one is the geometric parameters such as aspect ratio of the cavities, window's dimensions, heating element's length and the other one is thermal parameters including Ra and Pr numbers.;The results of the study are concerned with the heat transfer through the system and the details of the fluid flow.;The first part of the thesis deals with the numerical study of natural convection in cavity with localized heating from below or from one side or both from below and one side, and with an isothermal window on the left vertical side.;In the second part of the thesis, we study numerically the natural convection in partitioned enclosure with localized heating from below, with two isothermal windows on the vertical sides.;The results are reduced in terms of the Nusselt number as a function of the Rayleigh number, and other non dimensional geometrical parameters. The isotherms and streamlines are produced for various Rayleigh numbers and geometrical conditions.;It is found that the heat transfer is an increasing function of Rayieigh number, and of the position of the heat source. The heat transfer is enhanced if the heat source is positioned at the center of the cavity. That place presents the optimal position of the partition where heat transfer is maximized. (Abstract shortened by UMI.)... |
