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Skin Friction Fields and Surface Dye Patterns on Delta Wings in Water Flows.

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Title: Skin Friction Fields and Surface Dye Patterns on Delta Wings in Water Flows.
Authors: Tianshu Liu1 tianshu.liu@wmich.edu, Makhmalbaf, M. H. M.1, Vewen Ramasamy, R. S.1, Kode, S.1, Merati, P.1
Source: Journal of Fluids Engineering. Jul2015, Vol. 137 Issue 7, p1-14. 14p.
Subjects: Frictional resistance (Hydrodynamics), Hydraulics, Optical flow, Mass transfer, Water tunnels
Abstract: This paper discusses the relationship between skin friction fields and surface dye patterns in surface luminescent dye visualizations in water flows, providing a theoretical foundation for extraction of high-resolution skin friction fields. The limiting form of the mass diffusion equation at a wall is recast as an optical flow equation connecting skin friction with the luminescent dye intensity. Snapshot solutions are obtained from a time sequence of luminescent intensity images by solving the optical flow equation via the variational method, and then a normalized skin friction field is reconstructed by averaging the snapshot solutions. An error analysis is given to identify the major error sources and the limitations of the technique. To evaluate the feasibility of this technique, surface luminescent dye visualizations on a 65 deg delta wing and a 76/40 deg double-delta wing are conducted in a water tunnel. The extracted skin friction topology on the delta wings and the velocity fields obtained by using particle image velocimetry (PIV) are discussed. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fluids Engineering is the property of American Society of Mechanical Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 109081974
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Skin Friction Fields and Surface Dye Patterns on Delta Wings in Water Flows.
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  Data: <searchLink fieldCode="DE" term="%22Frictional+resistance+%28Hydrodynamics%29%22">Frictional resistance (Hydrodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Hydraulics%22">Hydraulics</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+flow%22">Optical flow</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+transfer%22">Mass transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Water+tunnels%22">Water tunnels</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: This paper discusses the relationship between skin friction fields and surface dye patterns in surface luminescent dye visualizations in water flows, providing a theoretical foundation for extraction of high-resolution skin friction fields. The limiting form of the mass diffusion equation at a wall is recast as an optical flow equation connecting skin friction with the luminescent dye intensity. Snapshot solutions are obtained from a time sequence of luminescent intensity images by solving the optical flow equation via the variational method, and then a normalized skin friction field is reconstructed by averaging the snapshot solutions. An error analysis is given to identify the major error sources and the limitations of the technique. To evaluate the feasibility of this technique, surface luminescent dye visualizations on a 65 deg delta wing and a 76/40 deg double-delta wing are conducted in a water tunnel. The extracted skin friction topology on the delta wings and the velocity fields obtained by using particle image velocimetry (PIV) are discussed. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Fluids Engineering is the property of American Society of Mechanical Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=109081974
RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1115/1.4030041
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 14
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    Subjects:
      – SubjectFull: Frictional resistance (Hydrodynamics)
        Type: general
      – SubjectFull: Hydraulics
        Type: general
      – SubjectFull: Optical flow
        Type: general
      – SubjectFull: Mass transfer
        Type: general
      – SubjectFull: Water tunnels
        Type: general
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      – TitleFull: Skin Friction Fields and Surface Dye Patterns on Delta Wings in Water Flows.
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            NameFull: Makhmalbaf, M. H. M.
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            NameFull: Vewen Ramasamy, R. S.
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            NameFull: Kode, S.
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            NameFull: Merati, P.
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            – D: 01
              M: 07
              Text: Jul2015
              Type: published
              Y: 2015
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