DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf
ISBN Print: 978-1-56700-262-1
ISSN: 2377-2816
Thermal-hydraulic analysis of flow in rib-roughened passages with application to gas-cooled nuclear reactors
RESUMO
The present paper reports RANS simulations of the flow and heat transfer in a 2-dimensional ribroughened passage. Rib pitch-to-height ratios of 6, 9, and 12 are examined. The blockage ratio of the transversely-mounted rectangular ribs is 10%, making the case ‘very rough’. The Reynolds number, based on the channel bulk velocity and hydraulic diameter, is 30,000. Three low-Reynolds-number linear EVMs, namely the Lien-Chen-Leschziner k-ε model, the Menter k-ω-SST model, and a variant of Durbin’s v2-f formulation are examined. Results for a square rib profile are compared to those for the rib profile used in the fuel pins of Advanced Gas-cooled Reactors. All computations are undertaken using the commercial CFD code 'STAR-CD'. In comparison with experimental data, it emerges that the v2-f model generally returns more accurate results than the k-ε or k-ω-SST closures.