Investigation of the Effect of Vortex Generation on Flow Structure and Heat Transfer Enhancement Using Particle Image Velocimetry (PIV)

Paper #:
  • 2017-01-1609

Published:
  • 2017-03-28
Abstract:
The requirements of higher performance thermal systems in various engineering applications have catalyzed interest in looking for novel heat transfer enhancement techniques between surface and surrounding fluid in the systems. One promising passive technique to augment the heat transfer is to apply vortex generators (VGs) on the surface to generate longitudinal vortices in the main flow. These vortices strongly disturb the boundary layer structure and makes fluid swirl, which cause an intensive exchange of core and wall fluid, resulting in the improvement of heat transfer. The present work aims to implement the Particle Image Velocimetry (PIV) technique to advance the knowledge of flow structure and vortex interactions induced by VGs deployed in a V-formation arrangement as well as its influence on heat transfer enhancement in channel flow. A flow field test system, embedded with different VGs will be installed and the flow structure will be investigated. Three different configurations of vortex generators, a small single delta winglet pair, a large single delta winglet pair, and two winglet pairs deployed in a V-formation array will be fitted vertically on an aluminum flat plate and tested in a horizontal rectangular channel. An axial fan will be used to supply the flow of air through the test section. The flow behavior of air stream passing the VGs will be observed using an Atomizer Aerosol Generator, ATM 210. The air flow will be cooling the channel bottom wall which has embedded electric heating constructed as a layered structure. Electrical power will be continuously supplied to the plate from a DC power supply, resulting in a constant-heat-flux heat transfer surface. Data acquisition system will be set up to measure the pressure drop and temperatures in the test section. Temperature distributions on the heated aluminum plate will be measured using T type thermocouples to obtain the convective heat transfer coefficient and Nusselt numbers. Measurements will be conducted at different incoming air velocities, and PIV experiments will be conducted with and without the presence of VGs to perform the transverse section measurements at different cross sections along the streamwise direction to investigate the flow characteristics in the channel. The effects of Reynolds number, the attack angle of vortex generator, and the shape of vortex generators will be examined in this work.
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