%0 Journal Article %A Polidori, Guillaume %A Padet, Jacques %D 2003 %I Begell House %N 1-2 %P 14 %R 10.1615/JFlowVisImageProc.v10.i12.20 %T FLOW VISUALIZATION AND FREE CONVECTION HEAT TRANSFER AT THE JUNCTION OF SHORT CYLINDERS MOUNTED ON A HEATED WALL %U https://www.dl.begellhouse.com/journals/52b74bd3689ab10b,36fdf12441d6cbde,39952a1f3d2e2379.html %V 10 %X Unsteady free convection in the vicinity of vertical wall-mounted insulated short cylinders is considered under isoflux thermal conditions used for wall heating. Especially, this study is aimed at analyzing how free convection heat transfer at the wall can be locally modified by the presence of a short protrusion. For this purpose, the idea is to correlate local heat transfer at a given abscissa on the wall with the flow patterns at the junction for a large range of angular cylinder positions a around this abscissa. In contrast to a circular shape, it is shown that the presence of a cylinder with sharp edges embedded in a free-convection boundary layer induces heat transfer enhancement at a given abscissa for a < 50°. It is argued that flow visualization can be a powerful technique in the understanding of the complex local heat transfer process, especially by identifying both the position of the wake separation and the rotational flow features. %8 2003-06-01