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Experimental investigation of thermal mixing phenomena in a tee pipe

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Published/Copyright: April 24, 2015
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Kerntechnik
From the journal Kerntechnik Volume 80 Issue 2

Abstract

T-pipe designs have been widely used in the industry. Among them, mixing of hot and cold water is a common application. In the mixing process, cold and hot fluids are respectively injected through main and branch pipes, and are mixed in the downstream area of T-tube. High temperature hot water flows through the main pipe for a long time; hence, the pipe wall is at high temperatures. The fluid injected into the branch pipe is a cooling fluid. After mixing, the wall of the main pipe is under high thermal fluctuations causing strong thermal stresses, which will eventually lead to pipe damage and water loss. Through flow rate adjustments of the branch and main pipes, when the branch/main velocity ratio was greater than 7.8, showing that cold water hit the bottom of the main pipe and created a reverse flow. This reverse flow created large thermal stresses on the wall. Hence, the branch/main velocity ratio and the hot-water-mixing phenomenon are the focus of this study.

Kurzfassung

T-Stücke sind in der Industrie weit verbreitet, wobei das Mischen von heißem und kaltem Wasser eine häufige Anwendung ist. Während des Mischungsprozesses werden kalte und heiße Flüssigkeiten durch Hauptleitung und Abzweigungen eingespeist und im Auslaufbereich des T-Stücks gemischt. Heißes Wasser fließt längere Zeit durch die Hauptleitung, was zu einer hohen Temperatur der Leitungswände führt. Die in die Abzweigleitung eingespeiste Flüssigkeit ist ein Kühlmittel. Nach der Durchmischung treten hohe Temperaturschwankungen an den Wänden der Hauptleitung auf. Der thermische Stress führt letztlich zu Schäden an der Leitung und zu Wasserverlust. Durch Anpassung der Durchflussgeschwindigkeiten bei einem Verhältnis der Geschwindigkeiten in Hauptleitung und Abzweigungen größer als 7.8, zeigt sich, dass kaltes Wasser den Boden der Hauptleitung trifft und einen Rückfluss erzeugt. Dieser Rückfluss erzeugt ein hohes Maß an thermischem Stress an den Wänden. Deshalb stehen das Verhältnis der Fließgeschwindigkeiten in Hauptleitung und Abzweigungen und die Heißwasser-Vermischungsphänomene im Vordergrund dieser Studie.

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Received: 2014-12-30
Published Online: 2015-04-24
Published in Print: 2015-04-28

© 2015, Carl Hanser Verlag, München

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https://doi.org/10.3139/124.110467

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Summaries/Kurzfassungen
  4. Summaries
  5. Technical Contributions/Fachbeiträge
  6. Evaluation of A-dependence of cross-sections for light charged particle production in proton induced reactions at intermediate energies
  7. Sensitivity study with respect to direction of ADI method during re-flooding in AHWR
  8. Experimental investigation of thermal mixing phenomena in a tee pipe
  9. Flow impinging effect of critical heat flux and nucleation boiling heat transfer on a downward facing heating surface
  10. Operating experience feedback from safety significant events at research reactors
  11. Review of regulatory requirements relevant to calibration of monitoring instruments in research reactors
  12. The dust characteristics in the collisional plasma sheath at the presence of external magnetic field
  13. Shamir Secret Sharing Scheme with Dynamic Access Structure (SSSDAS): case study on nuclear power plant
  14. Criticality calculations with PN approximation for certain scattering parameters of Anlı-Güngör and Henyey-Greenstein phase functions in spherical geometry
  15. An analytical approach for a nodal formulation of a two-dimensional fixed-source neutron transport problem in heterogeneous medium
  16. Evaluation of gross radioactivity in foodstuffs
  17. Development of gamma spectroscopy employing NaI(Tl) detector 3 inch × 3 inch and readout electronic of flash-ADC/FPGA-based technology
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