Computer Simulation of Quench Propagation in QUELL
In the Quench Experiment on Long Length (QUELL), in the SULTAN facility, quench propagation was studied in a well instrumented sample wound using a Nb3Sn cable-in-conduit conductor (CICC) with central cooling channel, cooled by supercritical helium I. A few selected runs have been analyzed here by means of two different computer models — Mithrandir and Gandalf, using the same set of common input parameters, helium and material properties, heat transfer and fluid dynamic correlations. The predictions of the two codes are compared in detail with each other and against experimental data. Both codes are 1-D tools for the description of thermal-hydraulic transients in CICCs with cooling channel; Mithrandir differs from Gandalf mainly because it does not assume, as the latter does, the same thermodynamic state for the helium in the cable bundle region and the helium in the cooling channel. It turns out that although the 1-fluid model (Gandalf) gives a reasonable agreement with the experiment, 2-fluid (Mithrandir) modeling is more accurate both qualitatively and quantitatively.
KeywordsHeat Transfer Coefficient Quench Experiment Adaptive Finite Element Method Resistive Voltage Hydraulic Coupling
Unable to display preview. Download preview PDF.
- 1.A. Anghel, et al., The Quench Experiment on Long Length QUELL — Final Report, EPFL-CRPP, JAERI, MIT-PFC and SINTEZ-NIIEFA Report (1997).Google Scholar
- 4.C. Marinucci, L. Bottura, G. Vecsey, and R. Zanino, The QUELL experiment as a validation tool for the numerical code Gandalf, submitted to Cryogenics (1997).Google Scholar
- 6.S. DePalo, C. Marinucci, and R. Zanino, Stability estimate for CICC with cooling channel using one-and two-fluid codes, to appear in Adv. Cryo. Eng., Vol. 43.Google Scholar
- 7.R. Zanino, L. Bottura, L. Savoldi, and C. Rosso, Mithrandir+: a two-channel model for thermal-hydraulic analysis of cable-in-conduit super-conductors cooled with helium I or II, submitted to Cryogenics (1997).Google Scholar