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- W2225023260 abstract "Continuously improving the understanding of wall turbulence dynamics has been the goal of many experimental and numerical studies for decades. The main practical aspect that makes this knowledge so crucial is the fact that the wall shear stress is closely related to the dynamics of the near-wall structures. Experimental techniques in fluid mechanics have also experienced a great amount of advances in recent years. The present work details the development of an experimental configuration aimed at providing 3D-3C flow measurements in the very near-wall region of a large wind tunnel facility, leading to the assessment of the wall shear stress with improved accuracy. With that goal, a technique known as Holographic Particle Image Velocimetry is used, and measurements are made in small volumes close to the wall in the wind tunnel at Laboratoire de Mecanique de Lille. Full measurements in volumes as small as 1.5mm3 are made possible with the use of a microscope objective for magnification of the object field. Particles are illuminated from the side and the 90o scattered field recombines with reference wave for holographic inline recording. A calibration procedure is performed in order to relate reconstruction space coordinates to real measurement volume coordinates. Analysis of resulting particle fields shows that particle images reconstruct with very good axial accuracy, leading to believe that the configuration is indeed suited for this type of measurement. However, some optimization and adjustments are needed in order to improve the particle tracking results" @default.
- W2225023260 created "2016-06-24" @default.
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- W2225023260 date "2012-03-30" @default.
- W2225023260 modified "2023-09-26" @default.
- W2225023260 title "Holographic Particle Image Velocimetry for Wall Turbulence Measurements" @default.
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