Numerical investigation of the structural frequencies effects on flow induced vibration and heat transfer

In this research,a numerical simulation,using ansys cfx 11,is used to study the flowinduced vibrations (fiv) and heat transfer in a heated circular cylinder subjected to a uniform cross flow with reynolds number equals to 325. the cylinder is allowed to vibrate,both in in-line and in cross-flow directions. results of the computations are presented for various values of the structural frequencies of the oscillator. lock-in is observed for a fairly wide range of cylinder vibration frequencies centered around the vortex shedding frequency of the cylinder. the heat transfer rate is enhanced remarkably as the oscillating frequency of the cylinder approaches the natural shedding frequency. in one of cases,comparing with the stationary cylinder,the rate of heat transfer of the oscillating cylinder is increased by 13%.