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The Influence of Density Stratification and T-junction Geometry on Turbulent Penetration

Type of publication Peer-reviewed
Publikationsform Proceedings (peer-reviewed)
Publication date 2014
Author Kickhofel John, Trinca Cosimo, Prasser Horst-Michael,
Project Temperature Fluctuations in Fluid and Pipe Walls induced by Turbulent Mixing
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Proceedings (peer-reviewed)

Title of proceedings International Topical Meeting on Nuclear Thermal Hydraulics, Operation and Safety (NUTHOS-10)
Place Okinawa, Japan


Thermal fatigue may occur in T-junction piping in commercial nuclear power plants due to turbulent mixing of hot and cold coolant streams. One configuration of such mixing occurs at high main-to-branch Reynolds number ratios in which mixing occurs in the branch line due to turbulent penetration. This paper investigates flow structures, scalar profiles and scalar mixing spectrum in the branch of an adiabatic T-junction at high velocity ratios. High density differences, the result of large fluid temperature differences should be expected in NPP piping and therefore have been modeled with sucrose solutions for the purpose of these experiments. The T-junction facility of the Laboratory of Nuclear Energy Systems (LKE) at the ETH Zurich is utilized.