Abstract
High resolution particle image velocimetry is used to measure the turbulent velocity field for fully developed flow (Re = 2,872) in an enclosed channel. Photographs of particle displacement are obtained in a plane that is parallel to the flow and perpendicular to the walls. These are analyzed to give simultaneous measurements of two components of the velocity at more than 10,000 points. Maps of velocity vectors, spanwise vorticity and Reynolds stress reveal structural aspects of the turbulence. In particular, internal shear layers are observed, in agreement with predictions of direct numerical simulation. Ensemble-averaging of a number of photographs yields statistical properties of the velocity in good agreement with laser-Doppler velocimeter measurements, and with direct numerical simulations.
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Liu, ZC., Landreth, C.C., Adrian, R.J. et al. High resolution measurement of turbulent structure in a channel with particle image velocimetry. Experiments in Fluids 10, 301–312 (1991). https://doi.org/10.1007/BF00190246
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DOI: https://doi.org/10.1007/BF00190246