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An experimental study is made on the processes of heat transfer from the surface of aforced oscillating cylinder in a crossflow. A range of oscillation amplitude (A/D=0.1,0.2), forced oscillation frequency (0<St_c<1), and Reynolds number (Re=550,1100, 3500) is covered in water (Pr=6). Besides the increase at the natural vortexshedding frequency, large increases in the heat transfer are found at certain superharmonics.By using Digital Particle Image Velocimetry/Thermometry (DPIV/T), the increasein the heat transfer rate is found to correlate inversely with the distance at whichvortices roll-up behind the cylinder, i.e., the distance decreases when the heat transferincreases. The cause of the increase is found to be the removal of the stagnant and lowheat convecting fluid at the base of the cylinder during the roll-up of the vortices.

Experimental Study of Heat Convection From Stationary and Oscillating Circular Cylinder in Cross Flow