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Thermal-Hydraulics of Water Cooled Nuclear Reactors by Francesco D'Auria

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8

Pressure drops in nuclear thermal-hydraulics

Principles, experiments, and modeling

K. Umminger*; F. D’Auria    * AREVA, Erlangen, Germany University of Pisa, Pisa, Italy

Abstract

Pressure drops in a loop are consequence of the flow (except for gravity pressure drops). The consistent combination of mass flow rate and pressure drop determines the pumping power in all systems including water cooled nuclear reactors. The complexity of the issue may be grasped considering the following items: (a) two-phase flows; (b) singularities in the flow stream or at geometric discontinuities; (c) counter-current flow (liquid and steam); (d) flow reversal; (e) flashing of subcooled fluid including the extreme conditions of typical geysering. Pressure drops ...

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