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LDA measurements in a one-sided ribbed square channel at Reynolds numbers of 50,000 and 100,000

Ruck, Sebastian; Arbeiter, Frederik

Abstract:
Laser Doppler anemometry (LDA) measurements in the fully developed turbulent flow through a one-sided rib-roughened square channel with a rib-height-to-channel-height ratio of k/H=0.0667 and a rib-pitch-to-rib-height ratio of p/k=9 were carried out at Reynolds numbers (based on the channel height H and the mean bulk velocity uB) of ReH=5.0⋅104 and 1.0⋅105. Mean velocities, Reynolds normal, and shear stresses were determined. The first- and second-order statistical moments of the velocity differed slightly between both Reynolds numbers when normalized by the bulk velocity and the channel height. Deviations were attributed to a minor elongation increase in the large recirculation region behind the rib with increasing Reynolds numbers. The crucial role of turbulent diffusion was reflected in the non-coincidence of the maximum primary mean shear and the Reynolds normal stress as well as outward drifts of the Reynolds stress peaks along the rib crest. Turbulent diffusion contributed significantly to the turbulence kinetic energy (TKE) budget near the rib crest and within the separated shear layer, while mean convection made a remarkable contribution only at the rib leading edge. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000140234
Veröffentlicht am 22.11.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Neutronenphysik und Reaktortechnik (INR)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2021
Sprache Englisch
Identifikator ISSN: 0723-4864, 1432-1114
KITopen-ID: 1000140234
HGF-Programm 38.04.03 (POF IV, LK 01) Thermal Energy Storage
Erschienen in Experiments in fluids
Verlag Springer
Band 62
Heft 11
Seiten Art.-Nr. 232
Vorab online veröffentlicht am 20.10.2021
Nachgewiesen in Web of Science
Scopus
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