Abstract
The mechanism of symmetrical vortex shedding behind a cylinder in a uniform, upward flow by heating the wake with fine wires or by using a splitter plate or mesh is experimentally studied. In the case of heating the wake the vortices are gradually modified from Karman vortex streets to symmetrical vortices with increase of heat input. Similar symmetrical vortex shedding is also observed by increase of the splitter plate length or mesh number behind the cylinder. An eigenfrequency of symmetrical vortex shedding is experimentally determined and is explained by an instability of the shear layer separation at the side of the cylinder.
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