Luminescent Oil Film Flow Tagging Skin Friction Meter Applied to FAITH Hill.
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| Title: | Luminescent Oil Film Flow Tagging Skin Friction Meter Applied to FAITH Hill. |
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| Authors: | Husen, Nicholas M.1, Tianshu Liu2, Sullivan, John P.3 |
| Source: | AIAA Journal. Oct2018, Vol. 56 Issue 10, p3875-3886. 12p. |
| Abstract: | The luminescent oil film flow tagging skin friction meter is presented and used to collect time-averaged spatially distributed skin friction data on the surface of NASA's FAITH model. The technique estimates skin friction by monitoring the evolution of a luminescent oil film evolving under the influence of skin friction, pressure gradients, and gravity. The thickness distribution of the oil film, h, and the velocity of the surface of the oil film, uh, are measured experimentally, and the dynamic viscosity of the oil, μo, is taken from the oil manufacturer or is determined through calibration. Then, skin friction is estimated as τw≈μouh/h. The thickness distribution of the oil film is measured by ratioing the intensity of the luminescent signal from the fluorescent oil with the intensity of the incident light that is scattered from the surface of the model. The resulting quotient is independent of the intensity of the incident light and directly proportional to the thickness of the oil film. The velocity of the surface of the oil film is measured by tagging and following photochromic molecules in the oil film. The new luminescent oil film flow tagging skin friction data compare well with fringe image skin friction data. Also, an experimental study is conducted to determine the extent to which it is appropriate to neglect the effects of a pressure gradients and gravity when determining skin friction from the evolution of an oil film. Results are presented supporting that this approximation is appropriate for a sufficiently thin film of oil or for a sufficiently high skin friction magnitude. [ABSTRACT FROM AUTHOR] |
| Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics 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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 173424942 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Luminescent Oil Film Flow Tagging Skin Friction Meter Applied to FAITH Hill. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Husen%2C+Nicholas+M%2E%22">Husen, Nicholas M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tianshu+Liu%22">Tianshu Liu</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Sullivan%2C+John+P%2E%22">Sullivan, John P.</searchLink><relatesTo>3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22AIAA+Journal%22">AIAA Journal</searchLink>. Oct2018, Vol. 56 Issue 10, p3875-3886. 12p. – Name: Abstract Label: Abstract Group: Ab Data: The luminescent oil film flow tagging skin friction meter is presented and used to collect time-averaged spatially distributed skin friction data on the surface of NASA's FAITH model. The technique estimates skin friction by monitoring the evolution of a luminescent oil film evolving under the influence of skin friction, pressure gradients, and gravity. The thickness distribution of the oil film, h, and the velocity of the surface of the oil film, uh, are measured experimentally, and the dynamic viscosity of the oil, μo, is taken from the oil manufacturer or is determined through calibration. Then, skin friction is estimated as τw≈μouh/h. The thickness distribution of the oil film is measured by ratioing the intensity of the luminescent signal from the fluorescent oil with the intensity of the incident light that is scattered from the surface of the model. The resulting quotient is independent of the intensity of the incident light and directly proportional to the thickness of the oil film. The velocity of the surface of the oil film is measured by tagging and following photochromic molecules in the oil film. The new luminescent oil film flow tagging skin friction data compare well with fringe image skin friction data. Also, an experimental study is conducted to determine the extent to which it is appropriate to neglect the effects of a pressure gradients and gravity when determining skin friction from the evolution of an oil film. Results are presented supporting that this approximation is appropriate for a sufficiently thin film of oil or for a sufficiently high skin friction magnitude. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics 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.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.2514/1.J057114 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 3875 Titles: – TitleFull: Luminescent Oil Film Flow Tagging Skin Friction Meter Applied to FAITH Hill. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Husen, Nicholas M. – PersonEntity: Name: NameFull: Tianshu Liu – PersonEntity: Name: NameFull: Sullivan, John P. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 00011452 Numbering: – Type: volume Value: 56 – Type: issue Value: 10 Titles: – TitleFull: AIAA Journal Type: main |
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