Abstract
The stronger the driving forces for flow processes the more stable are the resulting phenomena and vice versa. Many of the processes in nuclear thermal hydraulics are associated with low driving forces and tend to instability. This chapter presents a nonlinear stability analysis on some prominent examples in the nuclear thermal hydraulics: the flow boiling and condensation stability analysis. After a state-of-the-art review the AREVA boiling stability data for the ATRIUM 10B fuel bundle are compared with state-of-the-art predictions using the methods presented in this monograph. The classical boiling instability analysis is accomplished with the seldom-presented flow condensation stability analysis in a complex system of emergency condensers consisting of a large number of 1D condensing pipes submerged in a 3D pool. Condensation at the high-pressure side leads to all flow patterns for nearly horizontal pipes with all their instabilities. It is coupled with the 3D boiling of the secondary pool side. The complex picture is very informative for what can be expected and what has to be avoided in such designs.
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Kolev, N.I. (2011). Flow boiling and condensation stability analysis. In: Multiphase Flow Dynamics 5. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20601-6_6
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DOI: https://doi.org/10.1007/978-3-642-20601-6_6
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