Transient measurement of dual channel CICC heat transfer coefficients on a full size ITER conductor
Dual channel Cable-In-Conduit Conductors (CICC) provide low hydraulic resistance and faster central channel circulation, limiting superconductors temperature rise. The Poloidal Field insert Sample (PFIS) was tested in the Sultan facility to evaluate the thermal coupling between the CICC channels upon an experimental heat transfer coefficient assessment. Simple assumptions on the flow -homogeneous central and annual temperatures, no jacket conduction, no steel inertia response to a Heavyside temperature evolution at the inlet, using a Laplace transformation. Transient temperature step data fitted with the analytical with the analytical resolution provide heat transfer coefficients as a function of mass flow rate, compared to crude predictions and steady state evaluations, where annular and central temperatures are homogenized in compliance with the CICC heat transfer characteristic length. The transient measurements are subject to inertia and diffusity of the conductor, whereas comparable steady state measurements suffer from annular isothermal assumption. Recommendations are made for the thermohydraulic instrumentation of future conductor samples.
Bibliographic Reference: An oral paper given at: CHATS: Computation of tHermo-hydrAulic Transients in Superconductors Organised by: CHATS Committee Held at: Enschede, The Netherlands
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: email@example.com
Record Number: 200518334 / Last updated on: 2005-09-26
Original language: en
Available languages: en