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Abstract
Combined natural convection and radiation in a differentially heated square enclosure is studied numerically. The enclosure is partially divided by a thin, poorly conducting vertical divider projecting from the floor or the ceiling of the enclosure. The effects of thermal radiation on the heat transfer and flow patterns in partially or fully divided enclosures are examined for a moderate Rayleigh number. Radiation increases the circulating flow rate and significantly enhances the heat transfer. Radiant heat exchange between the divider and the sidewalls strongly influences the temperature distribution in the divider and its vicinity, which in turn affects the flow patterns on either side of the divider.