التفاصيل البيبلوغرافية
| العنوان: |
Wall superheat prediction in narrow rectangular channels under fully developed boiling of water at low pressures |
| المؤلفون: |
Ghione, Alberto, 1989, Noel, Brigitte, Vinai, Paolo, 1975, Demaziere, Christophe, 1973 |
| المصدر: |
Proc. 16th Int. Topl. Mtg. Nuclear Reactor Thermal Hydraulics (NURETH-16). 10:8360-8373 |
| مصطلحات موضوعية: |
SULTAN-JHR, Narrow rectangular channel, Research reactor, Wall superheat, Fully Developed Boiling |
| الوصف: |
The modeling of two-phase heat transfer is a crucial issue in the safety analysis of nuclear reactors. Thethermal-hydraulic correlations employed in this kind of simulations are usually derived from experimentsthat were carried out over limited ranges of parameters and for specific geometries. Therefore theirapplicability to systems with different characteristics has to be carefully scrutinized.In this paper, an assessment study of wall superheat correlations under fully developed boiling ispresented. This is a contribution to the validation and improvement of the thermal-hydraulic modeling ofthe Jules Horowitz Reactor, which is a research reactor under construction at CEA-Cadarache (France).The SULTAN-JHR experiments are used. These tests were performed at CEA-Grenoble with upwardwater flow in a vertical uniformly heated narrow rectangular channel with gap of 2.16 mm. Theexperimental conditions ranged between 0.2 and 0.9 MPa for the pressure and between 0.5 and 4.4MW/m2 for the heat flux.It is shown that the correlations of Thom and Jens-Lottes significantly overestimate the wall superheat.The correlation of Belhadj and Qiu, which were developed for narrow channels at low heat fluxes, cannotaccurately predict the experimental data. On the other hand, satisfactory results can be obtained withGorenflo (standard deviation of 11.9%) and a simplified version of the Forster-Greif (standard deviationof 10.1%) correlations. In conclusion, considering the validity range of the above correlations along withthe outcomes of the current assessment, the simplified Forster-Greif correlation is thus recommended forthe analysis of the JHR. |
| URL الوصول: |
https://research.chalmers.se/publication/222001 |
| قاعدة البيانات: |
SwePub |