Heat slug propagation in QUELL. Part I: Experimental setup and 1-fluid GANDALF analysis

The experimental setup for heat slug propagation at zero current and field in the QUench Experiment on Long Length (QUELL) is described and re-evaluat ed. Eight inductively heated and four resistively heated runs are considere d and analyzed with the 1-fluid GANDALF model, which assumes perfect coupli ng between bundle and hole helium in the two-channel cable-in-conduit condu ctor (CICC). Although adequate to predict the hydraulic response, the 1-flu id model exhibits an intrinsic limitation to accurately simulate the evolut ion of the conduit temperature at different sensor locations during heat sl ug propagation. In general it appears that the analysis of this type of slo w transients requires a 2-fluid model, as considered in Part II of the pres ent study. (C) 1999 Elsevier Science Ltd. All rights reserved.