Effect of vortex-induced vibration of finned cylinders on heat transfer enhancement

Abstract

Two-degree-of-freedom vortex-induced vibration (VIV) of a finned cylinder with heat transfer is studied numerically at the Reynolds number Re = 150. The governing equations in the Arbitrary Lagrangian-Eulerian frame are solved by the finite volume method. The dynamics of the oscillating cylinder (with or without fins) in the fluid flow was approximated as a mass-spring system. The effects of the number and arrangement of the fins (14 different cases) on the vortex shedding pattern, vibration amplitude, and frequency and heat transfer of the cylinder are investigated and discussed. The results indicate that in comparison with the stationary state, the effects of the number and arrangement of the fins on the wake pattern and the heat transfer enhancement in the VIV state are significant. Different vortex shedding pattern like 2S, P, 2P, S + P and combination of them with stable or unstable interactions between vortices and cylinders are observed in an oscillating cylinder. In the vibration state of finned cylinders, the heat transfer enhances up to 50.4% with respect to the stationary state and increases up to 64% with respect to the stationary smooth cylinder.

Vibration-induced streaming flow near a sharp edge: Flow structure and instabilities in a large span of forcing amplitude

“…In an applied viewpoint, low-frequency vibrations are ubiquitous in numerous applications ranging from common household devices, transportation vehicles, ocean devices, industry machines, to human motions. In addition to harvesting vibration energy by piezoelectric effects [8][9][10], it has also been exploited as a possible way to enhance mass [11,12] and heat [13] transfer via the streaming vortices generated by this periodic forcing. In this prospect, a significant advantage of low-frequency actuation is the simplicity of the required instrumentation, which is in line with the recent trends to develop low-cost millifluidic or microfluidics lab-on-a-chip systems for various applications [14].…”

Hydrodynamic characteristics of flow past a circular cylinder with four attached flexible plates in a high Reynolds number turbulent flow

“…In the flow past a cylinder with a Reynolds number higher than 40, the vortex-shedding phenomenon occurs behind the cylinder and produces an oscillating force on the cylinder. This situation causes the cylinder vibration, naming the vortex-induced vibration (VIV) (Huera-Huarte and Bearman, 2009; Williamson and Govardhan, 2008; Izadpanah et al, 2018, 2019; Lu et al, 2019; Ebrahimi et al, 2021). Hence, many numerical or experimental studies have been performed to control or suppress the hydrodynamic forces (Lift and Drag forces) acting on the cylinder.…”