Volume 54

Flow-Induced Vibration and Heat Transfer Characteristics of Two Tandem Cylinders in Different Spacing Ratios Haoyu He, Lin Ding, Yue Sun, Tian Song

Abstract

The vibration and heat transfer characteristics of two tandem cylinders with two degrees of freedom at different reduced velocities(U*) and spacing ratios were numerically investigated. The amplitude, trajectory, time averaged Nusselt number, vortex shedding, and temperature fields were analyzed. Results show that the dimensionless amplitudes of the two cylinders exhibited similar variation trends with increasing U*, first increasing and then decreasing. The trajectories of both cylinders formed 8-shaped patterns. The time averaged Nusselt number (NuA) of cylinder 1 was higher than that of cylinder 2, and both increased with increasing U*. The vortices shed from cylinder 1 covered the surface of cylinder 2, creating high temperature gradients and enhanced heat transfer on the surfaces of both cylinders.

Keywords flow-induced vibration; heat transfer; Spacing ratio; two degrees of freedom vibration