Akademik Veri Yönetim Sistemi
Journal of the Faculty of Engineering and Architecture of Gazi University, cilt.38, sa.3, ss.1805-1820, 2023 (SCI-Expanded)
In this study; effects of obstacles with heat flux, with different location and geometry in a vertical channel on mixed convection heat transfer and flow was investigated numerically. Effects of location, number and geometry of obstacles on heat transfer and flow properties have been examined. The effect of two semi-cylindrical obstacles located one under the other, four semi-cylindrical obstacles located one under the other on opposite sides, four rectangular obstacles located one under the other on opposite sides, on heat transfer and flow properties were investigated in the study. As a result, it was obtained that Nu number increases with increasing distance between obstacle (L/D) and natural convection effects (Ri number). For both obstacle geometries, increasing L/D ratio and Ri number causes similar effect on Nu number and enhances heat transfer. It was determined that Nu numbers obtained for semi-cylindrical obstacles are higher than the Nu numbers of rectangular obstacles. The highest Nu number can be obtained for L/D=1,5 and Ri=200 for both obstacle geometries. It has also been shown that numerical results can well represent the temperature distribution and flow properties by comparison of these results with an experimental result from the literature.