Using oscillations to enhance heat transfer for a circular cylinder
An experimental investigation into the effects of transverse oscillations on the heat transfer from a circular cylinder in cross-flow was carried out. The cylinder's heat transfer coefficient was measured for a wide range of oscillation frequencies and amplitudes. Heat transfer enhancement was found to be strongly dependent on synchronization with harmonics of the natural shedding frequency, the cylinder wake mode, and the cylinder transverse velocity. For representative oscillation conditions, the velocity and temperature fields in the near wake were measured using digital particle image thermometry and velocimetry (DPIT/V). This revealed several mechanisms that explain the observed heat transfer enhancement.
© 2006 Elsevier Ltd. Received 26 February 2004; received in revised form 6 August 2004. Available online 11 April 2006. This work was supported by the US National Science Foundation under grant CTS 9903346. The first author would also like to thank the National Defense Science and Engineering Graduate Fellowship program for financial support.