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Experimental and numerical investigations of wall temperature fluctuations due to thermal mixing in an annulus
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.ORCID iD: 0000-0001-5595-1952
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.ORCID iD: 0000-0001-8743-7157
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.ORCID iD: 0000-0003-3016-3698
2016 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Wall temperature fluctuations during thermal mixing of water in an annular test section have been measured and numerically predicted. The characteristics of the temperature fluctuations, such as their amplitudes and frequencies, are closely related to a premature structural failure due to the thermal fatigue. The goal of the present work has been to obtain experimental data on the convective heat transfer in presence of thermal mixing and use the data for validation of computational codes. During the experiments, two water streams at significantly different temperatures and at pressure 7.2 MPa are mixing in an annular test section, causing significant fluctuations of temperatures in walls surrounding the mixing zone. In parallel to experiments, the analyses of water mixing and of the resulting wall temperature fluctuations have been carried out using the Large Eddy Simulations (LES) with conjugate heat transfer approach. A similar behavior of temperature fluctuations has been observed in experiments and calculations. In particular, it has been both calculated and measured that the wall temperature spectrum varies at different locations in the test section and the dominant frequencies of fluctuations for the case presented in the paper are in the range of 0.1 to 0.2 Hz.

Place, publisher, year, edition, pages
2016.
Keywords [en]
Thermal mixing, Conjugate Heat Transfer, Wall temperature measurement, Large Eddy Simulations, Thermal fatigue
National Category
Energy Engineering
Research subject
Energy Technology; Physics
Identifiers
URN: urn:nbn:se:kth:diva-238755OAI: oai:DiVA.org:kth-238755DiVA, id: diva2:1262279
Conference
First Pacific Rim Thermal Engineering Conference (PRTEC)
Projects
THEMFATHEMFE
Funder
Swedish Radiation Safety Authority, 47385
Note

QC 20181217

Available from: 2018-11-10 Created: 2018-11-10 Last updated: 2019-05-17Bibliographically approved

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Anglart, HenrykBergagio, MattiaThiele, Roman

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CiteExportLink to record
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