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Title: Picking Up Speed: Convective Velocimetry in Low-Reynolds Number Turbulent Channel Flow
Authors: Stadlan, Joshua
Advisors: Hultmark, Marcus
Department: Mechanical and Aerospace Engineering
Class Year: 2016
Abstract: This paper proposes and implements the adaptation of a Malley probe to measure convection velocity in turbulent shear flow and begins to assess its efficacy as a ve-locimeter. Pitot tube mean velocity measurements and Malley probe convection ve-locity measurements were made in a low-Reynolds number incompressible turbulent channel flow, using temperature as a passive scalar, to evaluate, based on Taylor’s frozen turbulence hypothesis, the relationship between convection velocity and mean velocity. Initial results do not support the view that convection velocity is indepen-dent of the local mean velocity, inviting further investigation into the viability of the Malley probe as a non-invasive velocimeter, whether in fluid mechanics research or aviation. Note: It was recently discovered that Sontag and Gordeyev presented a paper at the AIAA Plasmadynamics and Lasers Conference in June 2015, demonstrating the use of a Malley probe as a non-intrusive velocity measurement technique, as this pa-per does, though not yet published as a full journal article. Because the existence of, and therefore the conclusions of, this article were not known to the author of this thesis during design, experimentation, and analysis, and was not considered in the research process, it is not discussed in this thesis. However, cursory evaluation of the paper reveal significant differences in the set-up, with reason to believe that the experiment has a more accurate approach to convective velocity measurements, based on Taylor’s hypothesis. The author intends to evaluate the paper more carefully and relate the data described in this thesis.
Extent: 96 pages
Access Restrictions: Walk-in Access. This thesis can only be viewed on computer terminals at the Mudd Manuscript Library.
Type of Material: Princeton University Senior Theses
Language: en_US
Appears in Collections:Mechanical and Aerospace Engineering, 1924-2016

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