Document Type

Theses, Masters

Rights

This item is available under a Creative Commons License for non-commercial use only

Publication Details

Dublin institute of Technology, 2016.

Abstract

The effect of vortex generators (VGs) on the fluid flow and heat transfer in a wide range of engineering applications has been studied extensively in the literature. Many of these studies examined the effects of VGs in heat exchanger applications where significant enhancement in thermal performance has been demonstrated; however the vast majority of studies presented in the literature provide insights into global VG performance data rather than examining the underlying flow structures that provide enhancements. In this experimental investigation Particle Image Velocimetry (PIV) is employed to investigate the flow field resulting from a single pair of wall-mounted delta winglets placed on a flat surface within a well controlled Blasius boundary layer. This research adds to the literature by providing three-dimensional measurement of the complete flow field with exceptional spatial resolution and accuracy thus enabling detailed statistical observations of the flow. The high-fidelity nature of the measurements is demonstrated by extracting higher order statistics of the primary flow structure by tracking the position of the vortex core using the streamwise vorticity and the !2 criterion. The complex underlying flow dynamics that lead to increased mixing, increased skin friction, and increased heat transfer are presented.

DOI

10.21427/D7KC9P

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