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Understanding multiphase flow and heat transfer : perception, reality, future needs

Podowski M.

Archives of Thermodynamics

2005

Vol. 26, no. 3

3-20

The purpose of this paper is to overview selected physical phenomena governing two- and multiphase flows and heat transfer, including scale-dependent modelling issues, gas/liquid and gas/liquid/solid interfacial interactions, and theoretical and computational modelling concepts. The main emphasis is given to the assessment of the current status against ultimate expectations on the one hand, and practical needs on the other hand. Several examples are used to illustrate the state-of-the-art theoretical and numerical predictions of two-phase flow at different scale levels, geometries and conditions.

Modeling of two-phase flow and heat transfer in nuclear reactors; overview of recent advances

Podowski M.

Prace Naukowe Politechniki Warszawskiej. Konferencje

2001

z. 21

201-215

Due to the complexity of multiphase flow phenomena, including both modeling and computational issues, a one-dimensional modeling framework has been typically used sofar in the analysis of boiling channels und systems. The growing range of applications and the needs for belfer understanding multiphase phenomena in nuclear technology, which include but are not limited to, the next generation reactors, require that analytical and computational tools be developed extending far beyond the current generation codes. The necessary innovations should encompass modeling concepts, numerical methods and computalional structure. It is interesting to note that in addition to technical advancements affecting operation and safety of nuclear installations, new mechanistic models and codes will also have significant direct impact on cost effectiveness. This is due to the fact that computer simulations using physically-based models will eventually reduce the experimental efforts which are needed today mainly to obtain data for new correlations being developed for specific designs and operating conditions. Furthermore, a better understanding of the physics of multiphase flows should help to design future experiments and develop new instrumentation and experimental techniques. The objective of this paper is to present an overview of the recent progress made in the modeling and computer simulations of two-phase flow in heat transfer in nuclear reactor systems and components.