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BINORMAL COOLING ERRORS IN SINGLE HOT-WIRE MEASUREMENTS
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1663-3553
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1146-3241
2016 (English)In: JOURNAL OF THEORETICAL AND APPLIED MECHANICS, ISSN 1429-2955, Vol. 54, no 1, 305-310 p.Article in journal (Refereed) PublishedText
Abstract [en]

In single-wire hot-wire measurements, velocity fluctuations acting normal to the hot-wire and its prongs will cause additional heat transfer known as binormal cooling. With respect to wall turbulence, the influence of this additional cooling is well-studied for crossed wires, while it is commonly ignored in single hot-wire measurements. The latter view is challenged in the recent work by Drozdz and Elsner (2014) that claims significant errors in variance measurements when using single-wire probes in turbulent boundary layers. This short communication revisits these claims and quantifies binormal cooling errors through an expansion of the effective-velocity concept and utilisation of direct numerical simulation data. Results support the common habit that binormal cooling errors can safely be ignored in single hot-wire measurements.

Place, publisher, year, edition, pages
2016. Vol. 54, no 1, 305-310 p.
Keyword [en]
hot-wire anemometry, measurement errors, wall turbulence
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-183345DOI: 10.15632/jtam-pl.54.1.305ISI: 000369506300026ScopusID: 2-s2.0-84955059366OAI: oai:DiVA.org:kth-183345DiVA: diva2:909586
Note

QC 20160307

Available from: 2016-03-07 Created: 2016-03-07 Last updated: 2016-03-19Bibliographically approved

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Örlü, RamisAlfredsson, P. Henrik
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