Abstract
When one or three ribs heated isothermally were placed on the lower plate of horizontal or slightly inclined two parallel plates, the local heat transfer around ribs was measured by means of Shadowgraph method and the effects of heat transfer on distance of parallel plates, inclination angle and spacing of the ribs were discussed. In order to examine the interaction of convection flow, the flow pattern was visualized by smoke. From above results, following conclusions were drawn: (1) the heat transfer is symmetry with centerline for horizontal plates (angle=0). (2) when inclined, heat transfer of single rib changes such that heat transfer on the higher sidewall keep unchanged and that on the lower and top sidewalls are very large. (3) when plate angle is changed, the center and lower rib in three ribs has a similar tendency in variation of heat transfer, but higher positioned rib doesn't have it.
