Study of Supercritical Carbon Dioxide Natural Circulation by the Use of CFD Codes
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
A12-5 Thermalhydraulics of High Prandtl-Number (Supercritical) Flows (II)

Eugenio Molfese (Università di Pisa)
Walter Ambrosini (Università di Pisa)
Nicola Forgione (Università di Pisa)
Pallippattu K. Vijayan (Bhabha Atomic Research Centre)
Manish Sharma (Bhabha Atomic Research Centre)


In this paper, experiments on natural circulation of CO

2, previously performed at the

Bhabha Atomic Research Centre (BARC), are addressed by the use of the FLUENT and the

STAR-CCM+ CFD codes. The experiments were carried out in an experimental facility installed

at the Reactor Engineering Division of BARC in Mumbai, consisting in a uniform diameter

(13.88 mm ID & 21.34 mm OD) rectangular loop (SCNCL) with different orientations of heater

and cooler, which can operate with either supercritical water and supercritical carbon dioxide.

The tests with carbon dioxide were performed at different power levels, at the supercritical

pressures of 8.6 and 9.1 MPa. The steady-state characteristics of the loop were obtained for the

horizontal heater and the horizontal cooler configuration (HHHC) and for the horizontal heater

and vertical cooler one (HHVC). Unstable behaviour was observed only for the HHHC

configuration. The FLUENT and the STAR-CCM+ codes were adopted for reproducing the

observed behaviour of the experimental loop in the HHHC configuration. Steady-state as well as

transient analyses were performed to be compared with the observed behaviour of the loop.

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