Abstract
Flow visualization experiments were conducted in water saturated porous media in a rectangular cavity heated from the vertical walls. Two different glass (6 mm and 12mm) beads were used. In general, the natural convection currents were found to be weak in the presence of smaller glass beads. When both the wall temperatures were above the density inversion temperature of water (4°C), unicellular flow was observed. The flow was bicellular when one of the walls of the cavity was below and the other was above 4°C. When both the wall temperatures were below 4°C, the flow could not be visualized for the effects of diffusion were stronger than convection.
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