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Towards a theoretical model of heat transfer for hot-wire anemometry close to solid walls
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. Keio University, Japan.
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
2017 (English)In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 68, p. 248-256Article in journal (Refereed) Published
Abstract [en]

Hot-wire anemometry readings where the sensor is close to a solid wall become erroneous due to additional heat losses to the wall. Here we examine this effect by means of experiments and numerical simulations. Measurements in both quiescent air as well as laminar and turbulent boundary layers confirmed the influences of parameters such as wall conductivity, overheat ratio and probe dimensions on the hot-wire output voltage. Compared to previous studies, the focus lies not only on the streamwise mean velocity, but also on its fluctuations. The accompanying two-dimensional steady numerical simulation allowed a qualitative discussion of the problem and furthermore mapped the temperature field around the wire for different wall materials. Based on these experimental and numerical results, a theoretical model of the heat transfer from a heated wire close to a solid wall is proposed that accounts for the contributions from both convection and conduction.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 68, p. 248-256
Keywords [en]
Hot-wire anemometry, Wall turbulence, Heat transfer
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-221391DOI: 10.1016/j.ijheatfluidflow.2017.09.002ISI: 000418973400021Scopus ID: 2-s2.0-85029514300OAI: oai:DiVA.org:kth-221391DiVA, id: diva2:1175145
Conference
11th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements (ETMM), SEP 21-23, 2016, Palermo, Italy
Note

QC 20180117

Available from: 2018-01-17 Created: 2018-01-17 Last updated: 2018-01-17Bibliographically approved

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Örlü, RamisAlfredsson, P. Henrik

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