Print Email Facebook Twitter Particle imaging velocimetry-based identification of coherent structures in normally impinging multiple jets Title Particle imaging velocimetry-based identification of coherent structures in normally impinging multiple jets Author Geers, L.F.G. Tummers, M.J. Hanjali?, K. Faculty Applied Sciences Department Multi-Scale Physics Date 2005-04-29 Abstract To gain a better insight into the effects of eddy structure and their thermal imprint on the impinging surface, we applied several methods to identify coherent structures in two arrangements of multiple jets. High-resolution particle imaging velocimetry measurements of the instantaneous fluid velocity have been performed to provide data for structure identification. Several methods based on critical point theory, i.e., vorticity magnitude, kinematic vorticity number, and second invariant of the velocity gradient tensor provided similar and generally useful information. However, in the flow considered they all appear inferior as compared with the proper orthogonal decomposition (POD). Despite lacking in conspicuous high energy modes, the flow showed to be well suited for POD, which provided clear identification of the near wall dominating vortical structure. Subject jetsvorticesturbulenceheat transfer To reference this document use: http://resolver.tudelft.nl/uuid:7f3f0559-42a3-4c3b-9dbe-8331fc604a8a DOI https://doi.org/10.1063/1.1900804 Publisher American Institute of Physics ISSN 1070-6631 Source http://link.aip.org/link/PHFLE6/v17/i5/p055105/s1 Source Physics of Fluids, 17 (5), 2005 Part of collection Institutional Repository Document type journal article Rights (c) 2005 The Author(s); American Institute of Physics Files PDF Tummers_2005.pdf 1.1 MB Close viewer /islandora/object/uuid:7f3f0559-42a3-4c3b-9dbe-8331fc604a8a/datastream/OBJ/view