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

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9

Constitutive equations

J.J. Jeong    Pusan National University, Pusan, South Korea

Abstract

The concept of constitutive equations is strictly linked with the modeling in two-phase nuclear thermal-hydraulics. This is specifically true for the commonly adopted “unequal-velocity, unequal-temperature” (UVUT) models. Constitutive equations or closure models are embedded into balance equations. Here one may distinguish within the broad category of closure equations (i.e., all the equations needed to solve the balance equations) the constitutive equations, as those equations derived from experiment. In this case constitutive equations have an empirical or a semiempirical nature. Closure equations aim at the numerical simulation of the phenomena ...

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