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In the present study, a new phenomenological two-phase interchannel mixing model was proposed for subchannel analysis in bubbly flow regime under PWR pressure level. The key constitutive relation is the modeling of void drift, for which the concept of a two-phase flow approaching an equilibrium state was adopted. Based on systematic CFD simulations, correlations were proposed to describe both the void fraction distribution at equilibrium state and the effective mixing velocity due to void drift.
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In der vorliegenden Arbeit wurde eine generelle Methode für die Wiedergabe zweiphasiger Strömungen einer gängigen detaillierten CFD auf einem groben Gitter entwickelt. Die für wenige Teilgeometrien und Strömungsparameter mit repräsentativem Charakter entwickelten numerischen Modelle ermöglichen eine geschlossene Beschreibung für die dazugehörigen Großkomponenten und damit eine umfassende dreidimensionale Strömungssimulation in für industrielle Anwendungen vertretbarer Berechnungsdauer. In this work a general method for reproduction of two-phase flow fields calculated by generic detailed CFD-simulations on a coarse grid is developed. Numerical models for only few sections of geometry and sets of flow parameters with respectively representative character allow a complete description of the large component considered. Thus a comprehensive three-dimensional CFD-simulation, meeting industrial needs for low computational costs, is generated.
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How does cavitation start? Presently, the nucleus theory provides the answer to this fundamental question. However the idea of nuclei contains inaccuracies that cannot be rationalized. Recent Developments in Cavitation Mechanisms discusses the uncertainties surrounding the nucleus theory, and proposes another theory of cavitation mechanism. Characteristically, the new theory is based on recent discoveries of cavity generation phenomena in separating flows. This book consists of chapters that introduce topics such as unsoundness of cavitation nuclei, and phenomena of cavity generation on walls
Cavitation. --- Hydrodynamics. --- Sonoluminescence. --- Hydrodynamics --- Two-phase flow
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Single-Phase, Two-Phase and Supercritical Natural Circulation Systems provides readers with a deep understanding of natural circulation systems. This book equips the reader with an understanding on how to detect unstable loops to ensure plant safety and reliability, calculate heat transport capabilities, and design effective natural circulation loops, stability maps and parallel channel systems. Each chapter begins with an introduction to the circulation system before discussing each element in detail and analyzing its effect on the performance of the system. The book also presents thermosyphon heat transport devices in nuclear and other industrial plants, a common information need for students and researchers alike. This book is invaluable for engineers, designers, operators and consultants in nuclear, mechanical, electrical and chemical disciplines.
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Two-phase flow. --- Gas flow --- Gas flow
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Sediment transport. --- Sediments (Geology) --- Two-phase flow.
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Mathematical models. --- Two-phase flow --- Inhomogeneous materials --- Two-phase flow --- Inhomogeneous materials
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Cavitation. --- Bubbles --- Dynamics. --- Bubble dynamics --- Dynamics --- Hydrodynamics --- Two-phase flow
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In this book, a new approach to the theory and practice of two-phase systems based on a global invariant - entropy, - and other invariants is formulated and experimentally confirmed. Offers a novel approach to the study of the two-phase flows systems based on statistical mechanics and probability theory Provides the tools for computing and modelling two-phase systems, predicts mass transfer and enables system optimization Provides a plethora of examples in among others, separation processes, dust production, pneumatic transport, and boiling bed.
Two-phase flow. --- Statistical mechanics. --- Computational fluid dynamics.
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Two-phase flow. --- Non newtonian fluids --- Non newtonian fluids
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