Vortex Structure behind a Highly Heated Cylinder in Turbulent Crossflow

Karman vortex structure behind a highly heated cylinder in a turbulent crossflow has been studied experimentally. The surface temperature of the cylinder is set up to 800°C. The Reynolds number based on the cylinder diameter is 750. For the heated cylinder set in the turbulent crossflow, the Karman vortex street can be clearly observed as the cylinder temperature is increased. Since the local temperature of the generated vortex is remarkably high compared with the main flow, the Karman vortex dissipating energy due to the main flow turbulence decreases with an increasing the cylinder temperature. Then, the local temperature of the vortex also decreases due to the turbulence motion. As the results, the vortex frequency-decreasing rate due to the cylinder heating in the turbulent crossflow becomes 1/2 compared with the laminar case.