Community Research and Development Information Service - CORDIS

  • European Commission
  • Publications
  • Development of a two-dimensional computer code for the prediction of two-phase heat transfer in an experimental light water reactor irradiation capsule


At the High Flux Reactor, Petten, light water reactor fuel rod irradiations are conducted using irradiation capsules specially designed to simulate pressurised water reactor and boiling water reactor operational conditions. To improve the understanding of conditions within these capsules, a computer code has been developed which analyses the natural circulation, boiling and condensation processes by which heat is transferred from the fuel rod, through the heat transfer medium, to the capsule outer wall. It also takes account of two-dimensional heat diffusion within the fuel pin and the capsule structure, combining this with a treatment of the phenomena of single and two-phase heat transfer and buoyancy driven flow which occur within the heat transfer medium itself. Buoyancy driven flow within the capsule is modelled very simply, assuming a single recirculating convection cell. Heat transfer is calculated for natural convection and partial or fully developed sub-cooled boiling, depending on the local conditions along the length of the fuel pin. Despite the simplifications, the code provides a novel approach for handling two-phase heat transfer in conjunction with two-dimensional heat diffusion in the whole system.

Additional information

Authors: KENNEDY T D A, JRC Petten (NL);MCALLISTER S, JRC Petten (NL);MARKGRAF J, JRC Petten (NL);RUYTER I A, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Article: Nuclear Energy, Vol. 30 (1991) No. 3, pp. 165-172
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top