European Turbulence Conference 2015

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15:45
15 mins

Turbulent convective heat transfer in an inclined cylinder with liquid sodium
Andrei Mamykin, Andrei Vasiliev, Ruslan Khalilov, Ilya Kolesnichenko, Peter Frick

Session: Thermally driven turbulence 2
Session starts: Thursday 27 August, 15:00
Presentation starts: 15:45
Room: Room H

Andrei Mamykin (Institute of Continuous Media Mechanics, Perm, Russia)
Andrei Vasiliev (Institute of Continuous Media Mechanics, Perm, Russia)
Ruslan Khalilov (Institute of Continuous Media Mechanics, Perm, Russia)
Ilya Kolesnichenko (Institute of Continuous Media Mechanics, Perm, Russia)
Peter Frick (Institute of Continuous Media Mechanics, Perm, Russia)

Abstract:
The natural turbulent convection of liquid sodium in a cell with end heat exchangers providing a fixed temperature drop is investigated experimentally. The cell is a straight thermally isolated tube with inner diameter D = 96 mm and length L ≈ 20D. Experiments are carried out for a fixed Rayleigh number Ra = 2.4 • 10^6 and for different tube orientations with respect to the gravity. A strong dependence of power transferred along the tube on the inclination angle is discovered: Nusselt number varies by an order in the investigated range of angles with a maximum approximately at 65 degrees to the vertical. Presented characteristics of the large-scale circulation (LSC) and turbulent temperature fluctuations demonstrate the fact that the convective heat transfer is mainly determined by the velocity of the LSC.