Volume 54

Influence of the Near-Wall Distance of a Single Cylinder on Flow-Induced Vibration and Heat Transfer Characteristics Yitong Fu, Dong Liu, Haoyu He, Tian Song, Lin Ding

Abstract

In this paper, the effect of near-wall distance on flow-induced vibration and heat transfer characteristics of a circular cylinder is numerically investigated. The amplitude ratio, frequency ratio, near-wake structure, and temperature distribution are analyzed. The results show that, the amplitude ratio increases with rising reduced velocity when U*≤5, and further increasing the reduced velocity leads to a transition of the cylinder’s behavior from the upper branch to the lower branch. When H=1D, the cylinder obstructs the temperature boundary layer development, resulting in reduced heat transfer, accompanied by the highest average temperature (Tmean) and the lowest Nusselt number (Numean); conversely, as the near-wall distance increases to H≥1.5D, along with a rise in wall height, heat transfer enhances, yielding higher Nusselt numbers.

Keywords Flow-induced vibration, vortex-induced vibration, convective heat transfer, near-wall distance, heat flux density