Natural Convection Properties into a Triangular-Channel: The Orientation and Aspect Ratio Influence

In this work, an experimental study is conducted on the natural convection of air flow into a horizontal and inclined open ended triangular-channels. The orientation is changed from 0o-horizontal position to 15o and 45o. Two different lengths aspect ratios (side length to channel length) namely, 0.125 and 0.166 are utilized. The outer channel wall is heated with a wide range of heat fluxes (from 200 to 1000 W/m2). The triangular-channel is cold formed as one-piece utilizing aluminum sheet with thickness of 2 mm and constant length of 600 mm. The purpose of adduced work is to investigate and simulate experimentally the influence of channel orientation, aspect ratio and surface heat flux on the thermal properties. The experimental data appears that the natural convection performance of air flow into a heated channel in terms of local Nusselt number for orientation case of 45o is higher about 16% to 20% than that the horizontal case for same conditions. Furthermore, the local Nusselt number increases for triangular-channel with aspect ratio (0.166) about 22% than that the channel with aspect ratio (0.125). The results of present study are validated than last study and a good closeness are observed.