Groove-induced drag reduction in annular flows

H. V. Moradi; J. M. Floryan

Groove-induced drag reduction in annular flows

H. V. Moradi
, J. M. Floryan

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

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.

Original language	English
Title of host publication	Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012
Publisher	Australasian Fluid Mechanics Society
ISBN (Print)	9780646583730
Publication status	Published - 2012
Externally published	Yes
Event	18th Australasian Fluid Mechanics Conference, AFMC 2012 - Launceston, Australia Duration: 3 Dec 2012 → 7 Dec 2012 http://people.eng.unimelb.edu.au/imarusic/proceedings/18%20AFMC%20TOC.htm

Publication series

Name	Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012

Conference

Conference	18th Australasian Fluid Mechanics Conference, AFMC 2012
Place	Australia
City	Launceston
Period	3/12/12 → 7/12/12
Internet address	http://people.eng.unimelb.edu.au/imarusic/proceedings/18%20AFMC%20TOC.htm

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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title = "Groove-induced drag reduction in annular flows",

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.",

author = "Moradi, \{H. V.\} and Floryan, \{J. M.\}",

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language = "English",

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series = "Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012",

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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 32 - Refereed conference paper (with host publication) › peer-review

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AU - Floryan, J. M.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

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M3 - RGC 32 - Refereed conference paper (with host publication)

SN - 9780646583730

T3 - Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012

BT - Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012

PB - Australasian Fluid Mechanics Society

T2 - 18th Australasian Fluid Mechanics Conference, AFMC 2012

Y2 - 3 December 2012 through 7 December 2012

ER -

Groove-induced drag reduction in annular flows

Abstract

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