Groove-induced drag reduction in annular flows

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review

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Author(s)

Detail(s)

Original languageEnglish
Title of host publicationProceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012
PublisherAustralasian Fluid Mechanics Society
ISBN (Print)9780646583730
Publication statusPublished - 2012
Externally publishedYes

Publication series

NameProceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012

Conference

Title18th Australasian Fluid Mechanics Conference, AFMC 2012
PlaceAustralia
CityLaunceston
Period3 - 7 December 2012

Abstract

Laminar pressure driven flows through annuli fitted with longitudinal grooves with an arbitrary cross-section have been analyzed. It is demonstrated that a reduced order model is an effective tool for extraction of geometric features that lead to the drag generation. It is shown that presence of the grooves may lead to a reduction of pressure loss in spite of increase of the surface wetted area. The drag decreasing grooves are characterized by the groove wave number M/R1/ being smaller than a certain critical value, where M denotes the number of grooves being used and R1 stands for the radius of the annulus. It is shown that the drag reduction mechanism relies on the re-arrangement of the bulk flow which leads to the largest mass flow taking place in the area of the largest annulus opening. Form of the optimal grooves, from the point of view of the maximum drag reduction, has been determined.

Bibliographic Note

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Citation Format(s)

Groove-induced drag reduction in annular flows. / Moradi, H. V.; Floryan, J. M.

Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012. Australasian Fluid Mechanics Society, 2012. (Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012).

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review