Direct full surface skin friction measurement using nematic liquid crystal techniques
Article
Article Title | Direct full surface skin friction measurement using nematic liquid crystal techniques |
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ERA Journal ID | 3790 |
Article Category | Article |
Authors | Buttsworth, D. R. (Author), Elston, S. J. (Author) and Jones, T. V. (Author) |
Journal Title | Journal of Turbomachinery |
Journal Citation | 120 (4), pp. 847-853 |
Number of Pages | 7 |
Year | 1998 |
Publisher | American Society of Mechanical Engineers (ASME) |
Place of Publication | United States |
ISSN | 0889-504X |
1528-8900 | |
Digital Object Identifier (DOI) | https://doi.org/10.1115/1.2841798 |
Web Address (URL) | https://asmedigitalcollection.asme.org/turbomachinery/article-abstract/120/4/847/438824/Direct-Full-Surface-Skin-Friction-Measurement |
Abstract | New techniques for the direct measurement of skin friction using nematic liquid crystal layers are demonstrated. Skin friction measurements can be made using a molecular rotation time technique or an equilibrium orientation technique. A mathematical model describing the molecular dynamics of the nematic liquid crystal layer has been introduced. Theoretical results from the proposed mathematical model are in excellent agreement with the current experimental measurements. It is thus demonstrated that the present model captures the essential physics of the nematic liquid crystal measurement techniques. Estimates based on the variance of the liquid crystal calibration data indicate that skin friction measurements to within ±4 percent should certainly be possible. The techniques offer the considerable advantage of simplicity, without any compromise on the accuracy, relative to other surface shear stress measurement techniques. The full surface measurement capacity of the equilibrium orientation technique is demonstrated by measuring the skin friction distribution around a cylindrical obstruction in a fully developed laminar flow. |
Keywords | aerodynamics; friction; mathematical models; molecular dynamics; nematic liquid crystals; shear stress; crystal; laminar flow; measurement method; skin friction |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 401201. Aerodynamics (excl. hypersonic aerodynamics) |
400105. Flight dynamics | |
401706. Numerical modelling and mechanical characterisation | |
Public Notes | There are no files associated with this item. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Oxford, United Kingdom |
https://research.usq.edu.au/item/q05y5/direct-full-surface-skin-friction-measurement-using-nematic-liquid-crystal-techniques
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