Microscopic digital Holographic PIV is used to measure the 3D velocity distributions in the roughness sublayer of a turbulent boundary layer over a rough wall. The sample volume extends from the surface, including the space between the tightly packed, 0.45 mm high, pyramidal roughness elements, up to about 5 roughness heights away from the wall. To facilitate observations though a rough surface, experiments are performed in a facility containing fluid that has the same optical refractive index as the acrylic rough walls. Magnified in line holograms are recorded on a 4864×3248 pixel camera at a resolution of 0.67μm/pixel. The flow field is seeded with 2μm silver coated glass particles, which are injected upstream of the same volume. A multiple-step particle tracking procedure is used for matching the particle pairs. In recently obtained data, we have typically matched ∼5000 particle images per hologram pair. The resulting unstructured 3D vectors are projected onto a uniform grid with spacing of 60 μm in all three directions in a 3.2×1.8×1.8 mm sample volume. The paper provides sample data showing that the flow in the roughness sublayer is dominated by slightly inclined, quasi-streamwise vortices whose coherence is particularly evident close to the top of the roughness elements.
Skip Nav Destination
ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
August 1–5, 2010
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4949-1
PROCEEDINGS PAPER
Three Dimensional Volumetric Velocity Measurements in the Inner Part of a Turbulent Boundary Layer Over a Rough Wall Using Digital HPIV Available to Purchase
Siddharth Talapatra,
Siddharth Talapatra
Johns Hopkins University, Baltimore, MD
Search for other works by this author on:
Joseph Katz
Joseph Katz
Johns Hopkins University, Baltimore, MD
Search for other works by this author on:
Siddharth Talapatra
Johns Hopkins University, Baltimore, MD
Joseph Katz
Johns Hopkins University, Baltimore, MD
Paper No:
FEDSM-ICNMM2010-30813, pp. 193-201; 9 pages
Published Online:
March 1, 2011
Citation
Talapatra, S, & Katz, J. "Three Dimensional Volumetric Velocity Measurements in the Inner Part of a Turbulent Boundary Layer Over a Rough Wall Using Digital HPIV." Proceedings of the ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 2, Fora. Montreal, Quebec, Canada. August 1–5, 2010. pp. 193-201. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30813
Download citation file:
8
Views
Related Proceedings Papers
Related Articles
The Depth of Correlation in Micro-PIV for High Numerical Aperture and Immersion Objectives
J. Fluids Eng (July,2006)
The Fluid Dynamics of LPT Blade Separation Control Using Pulsed Jets
J. Turbomach (January,2002)
The Dynamics of the Horseshoe Vortex and Associated Endwall Heat Transfer—Part I: Temporal Behavior
J. Turbomach (October,2006)
Related Chapters
Enhancing the Reconstruction Quality of Digital Hologram of MR Fluids
International Conference on Software Technology and Engineering (ICSTE 2012)
Cooling a Radar’s Electronic Board
Electromagnetic Waves and Heat Transfer: Sensitivites to Governing Variables in Everyday Life
Adaptive Grayscale Morphological Operators for Image Analysis
Intelligent Engineering Systems Through Artificial Neural Networks, Volume 17