Numerical study of heat transfer enhancement of channel via vortex-induced vibration
| Autor: | Jingwen Hu, Chung-Lung Chen, Steven R. Schafer, Junxiang Shi |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
business.industry Heat transfer enhancement Energy Engineering and Power Technology Mechanics Structural engineering Heat sink Vortex shedding Thermal diffusivity Nusselt number Industrial and Manufacturing Engineering Vortex Physics::Fluid Dynamics Boundary layer Heat transfer business |
| Zdroj: | Applied Thermal Engineering. 70:838-845 |
| ISSN: | 1359-4311 |
| Popis: | 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 Re D = 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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