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Effects of flow unsteadiness on the wall shear stress
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0001-7599-0895
School of Mechanical Engineering, University of Tehran.
2012 (engelsk)Inngår i: 26th IAHR Symposium on Hydraulic Machinery and Systems: 19–23 August 2012, Beijing, China, IOP Publishing Ltd , 2012, s. 62033-Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Measurements were performed on pulsating fully turbulent flows in a pipe test rig with a diameter of 100 mm. Sinusoidal oscillatory flow at different frequencies was superimposed on a mean flow of averaged Reynolds number Re=20000 based on the pipe diameter. The measurements have been performed at different forcing frequencies (0.001 < ω+ < 0.08) covering all the oscillatory regimes; quasi-steady, relaxation, quasi laminar and high frequency. The amplitude of the flow oscillation was small enough to allow a linear response in the measurements, i.e., all flow parameters showed an oscillatory behavior at the frequency of the flow. The amplitude of the oscillatory flow was about 10% of the mean velocity in all cases. The results include mean and phase averaged values of different parameters. The centerline velocity was measured by a 2D LDA system. Hot film and constant temperature anemometry system was used to determine the wall shear stress. Bulk velocity and pressure gradient along the pipe were also acquired. The results showed a good agreement with the previous analytical, experimental and numerical results available in the literature.

sted, utgiver, år, opplag, sider
IOP Publishing Ltd , 2012. s. 62033-
Serie
I O P Conference Series: Earth and Environment, ISSN 1755-1307 ; 6
HSV kategori
Forskningsprogram
Strömningslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-29350DOI: 10.1088/1755-1315/15/6/062033ISI: 000324782300200Scopus ID: 84874065498Lokal ID: 2ccffa67-094a-4b90-b375-ce829cbde74fOAI: oai:DiVA.org:ltu-29350DiVA, id: diva2:1002573
Konferanse
IAHR Symposium on Hydraulic Machinery and Systems : 19/08/2012 - 23/08/2012
Merknad
Validerad; 2012; 20121128 (ysko)Tilgjengelig fra: 2016-09-30 Laget: 2016-09-30 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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