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Title:Counter Rotating Vortices
Author(s):Gibson, Allison
Contributor(s):Chamorro, Leonardo P.
Heat Transfer
Mechanical Science
Abstract:A common method to enhance convective heat transfer is to utilize vortex-generating compact slender structures. When a vortex generator is placed in the streamwise direction of a flowing fluid, a pressure drop develops between the mean flow of the fluid and the wake region immediately downstream from the vortex generator. This pressure drop gives rise to a counter-rotating vortex pair (CVP). This CVP is a primary structure within the wake that governs and enhances mixing, while improving the heat transfer coefficient. The figure on the left shows the formation of a CVP as the fluid flows over a rectangular vortex generator located at x = -50 mm. The vectors show the fluid forming two distinct circulation zones that mirror one and other. The figure on the right shows that the CVP (shown with vorticity iso-sufaces) is prevalent in the near-wake for a significant distance downstream from the vortex generator until it eventually takes a more complex form downstream. By better understanding turbulent flows and vortex behavior, the overall efficiency of heat transfer can be greatly improved. For more information about the Image of Research--Undergraduate Edition go to:
Issue Date:2016-04
Rights Information:Copyright 2016 Allison Gibson
Date Available in IDEALS:2016-04-19

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