For natural convection in the geometrically complicated channel, the convection flow is suppressed by flow resistance due to such channel itself and the lopsided flow may take place. This may give serious influences on the heat transfer in the channel. The purpose of the present research is to investigate the natural convection flow and heat transfer inside the vertical channel where flow resistance is added at the lower end. In this paper, the flow resistance and width of the channel were changed and the influence on the flow and heat transfer was discussed in connection with flow pattern.
