Rough-wall turbulent channel flow is investigated via time-resolved tomographic particle image velocimetry (PIV). The optical refractive index of the transparent channel wall is matched with that of the liquid, allowing 3D measurements to be performed in the bulk flow as well as very close to the rough surface. The liquid is a concentrated solution of sodium iodide in water (62%–64% by weight). Roughness consists of staggered pyramidal elements that satisfy the “well-characterized” flow conditions. Our research is aimed at studying mechanisms involved generation of coherent structures as large-scale turbulence and the mean flow interact with the roughness elements, and their subsequent propagation away from the wall. We have adopted tomographic PIV to generate time-resolved, 3D data. Our measurements are performed at Reynolds number equal to 40000.
- Fluids Engineering Division
Time Resolved Tomographic PIV Measurements of Rough-Wall Turbulent Channel Flow
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Miorini, RL, Zhang, C, & Katz, J. "Time Resolved Tomographic PIV Measurements of Rough-Wall Turbulent Channel Flow." Proceedings of the ASME 2013 Fluids Engineering Division Summer Meeting. Volume 1C, Symposia: Gas-Liquid Two-Phase Flows; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Liquid-Solids Flows; Multiscale Methods for Multiphase Flow; Noninvasive Measurements in Single and Multiphase Flows; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes; Transport Phenomena in Mixing; Turbulent Flows: Issues and Perspectives. Incline Village, Nevada, USA. July 7–11, 2013. V01CT24A002. ASME. https://doi.org/10.1115/FEDSM2013-16238
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