Numerical study of heat transfer enhancement of channel via vortex-induced vibration

Junxiang Shi, Jingwen Hu, Steven R. Schafer, Chung-Lung Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Thermal diffusion in a developed thermal boundary layer is considered as an obstacle for improving the heat transfer rate of air-cooled heat sinks. In this work, a passive method using vortex-induced vibration (VIV) is introduced to disrupt the thermal boundary layer and thereby increase the heat transfer rate. A cylinder with a flexible plate is placed in a clean channel; the vortex shedding due to the cylinder gives rise to the oscillation of the plate downstream. The consequent flow-structure-interaction (FSI) strengthens the disruption of the thermal boundary layer by vortex interaction with the walls, and improves the mixing process. This novel concept is demonstrated by a two-dimensional modeling study at ReD = 204.8, 245.7, 286.7, 327.7, and two inlet temperature profiles. The results indicate the VIV can significantly increase the average Nusselt (Nu) number, with a maximum enhancement of 90.1% over that of a clean channel.

Original languageEnglish
Pages (from-to)838-845
Number of pages8
JournalApplied Thermal Engineering
Volume70
Issue number1
DOIs
StatePublished - 5 Sep 2014

Keywords

  • Air-cooled heat sink
  • Flow structure interaction
  • Heat transfer enhancement
  • Modeling simulation
  • Passive flow control
  • Vortex dynamics
  • Vortex shedding
  • Vortex-induced vibration

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