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Journal ArticleDOI

Dynamics of multiple parallel boiling channel systems with forced flows

02 Aug 1999-Nuclear Engineering and Design (North-Holland)-Vol. 192, Iss: 1, pp 31-44
TL;DR: In this article, the authors investigated the nonlinear dynamics of multiple parallel boiling channels with forced flows by using the Galerkin nodal approximation method and constructed stability maps for multiple-channel systems subject to a constant total mass flow rate on the parameter plane of the subcooling and phase change numbers.
About: This article is published in Nuclear Engineering and Design.The article was published on 1999-08-02. It has received 79 citations till now. The article focuses on the topics: Subcooling & Boiling.
Citations
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Journal ArticleDOI
TL;DR: An updated review of two-phase flow instabilities including experimental and analytical results regarding density-wave and pressure-drop oscillations, as well as Ledinegg excursions, is presented in this article.

292 citations


Cites methods from "Dynamics of multiple parallel boili..."

  • ...Lee and Pan [257] studied the behaviour of a system with 1–5 channels using a MNS....

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Journal ArticleDOI
TL;DR: In this article, the authors explored experimentally the two-phase flow instability in a microchannel heat sink with 15 parallel microchannels and found that the magnitude of pressure drop oscillations may be used as an index for the appearance of reversed flow.

117 citations

Journal ArticleDOI
TL;DR: In this paper, the authors explore experimentally stabilizing flow boiling water in ten parallel micro-channel heat sinks with a diverging cross-section design and show that the stability boundary is plotted on the plane of the subcooling number against the phase change number (Npch).
Abstract: This paper explores experimentally stabilizing flow boiling water in ten parallel microchannel heat sinks with a diverging cross-section design. Each diverging microchannel has a mean hydraulic diameter of 120 µm and a diverging angle of 0.5° while the channel depth is uniform at 76 µm. Flow visualization shows that heat flux and mass flux significantly affect the stability of flow boiling in the parallel microchannels. The extent of pressure drop oscillations may be regarded as an index for the onset of flow boiling instability. The stability boundary is plotted on the plane of the subcooling number (Nsub) against the phase change number (Npch) and compared with microchannels with a uniform cross-section design in the literature. The present study confirms that, in terms of stability performance, the flow boiling in the parallel microchannel heat sinks with a diverging cross-section design is superior to a uniform cross-section design.

94 citations

Journal ArticleDOI
TL;DR: In this paper, the bubble dynamics in two parallel trapezoidal microchannels with a hydraulic diameter of 47.7μm were investigated and it was shown that the bubble grows in the axial direction both forward and backward with its length increases exponentially due to evaporation of the thin liquid film between the bubble and heating wall.

81 citations

Journal ArticleDOI
TL;DR: A systematic overview of all key two-phase instabilities focusing on the fundamental mechanisms leading to their occurrence is provided, with emphasis on how these mechanisms may change depending on whether flow may be classified as macro- or micro-channel.

74 citations

References
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Book
01 Sep 1989
TL;DR: The goal of this book is to present an elementary introduction on chaotic systems for the non-specialist, and to present and extensive package of computer algorithms for simulating and characterizing chaotic phenomena.
Abstract: The goal of this book qre to present an elementary introduction on chaotic systems for the non-specialist, and to present and extensive package of computer algorithms ( in the form of pseudocode) for simulating and characterizing chaotic phenomena. These numerical algorithms have been implemented in a software package called INSITE (Interactive Nonlinear System Investigative Toolkit for Everyone) which is being distributed separately.

1,859 citations

Book
06 Jan 1994
TL;DR: The phenomenology of chaos Towards a theory of nonlinear dynamics and chaos Quantifying chaos Special topics Appendices Index
Abstract: First Edition Preface First Edition Acknowledgments Second Edition Preface Second Edition Acknowledgments I. THE PHENOMENOLOGY OF CHAOS 1. Three Chaotic Systems 2. The Universality of Chaos II. TOWARDS A THEORY OF NONLINEAR DYNAMICS AND CHAOS 3. Dynamics in State Space: One and Two Dimensions 4. Three-Dimensional State Space and Chaos 5. Iterated Maps 6. Quasi-Periodicity and Chaos 7. Intermittency and Crises 8. Hamiltonian Systems III.MEASURES OF CHAOS 9. Quantifying Chaos 10. Many Dimensions and Multifractals IV.SPECIAL TOPICS 11. Pattern Formation and Spatiotemporal Chaos 12. Quantum Chaos, The Theory of Complexity, and other Topics Appendix A: Fourier Power Spectra Appendix B: Bifurcation Theory Appendix C: The Lorenz Model Appendix D: The Research Literature on Chaos Appendix E: Computer Programs Appendix F: Theory of the Universal Feigenbaum Numbers Appendix G: The Duffing Double-Well Oscillator Appendix H: Other Universal Feature for One-Dimensional Iterated Maps Appendix I: The van der Pol Oscillator Appendix J: Simple Laser Dynamics Models References Bibliography Index

1,055 citations

Book
01 Jan 1989
TL;DR: In this paper, the authors propose a linear least-squares data fitting algorithm for computing nonlinear systems of equations, which is based on the linear systems of Equations (LSE) algorithm.
Abstract: 1. Introduction. 2. Computer Arithmetic and Computational Errors. 3. Linear systems of Equations. 4. Interpolation. 5. Numerical Quadrature. 6. Linear Least-Square Data Fitting. 7. Solution of Nonlinear Equations. 8. Ordinary Diernetial Equations. 9. Optimization and Nonlinear Least Squares. 10. Simulation and Random Numbers. 11. Trigonometirc Approximation and the Fast Fourier Transorm. Bibliography.

984 citations

Book
21 Sep 1992
TL;DR: In this paper, the authors present a method for identifying chaotic vibrations in physical systems, including fractals and dynamical systems, based on the concept of spatiotemporal chaos.
Abstract: How to Identify Chaotic Vibrations. Models for Chaos Maps and Flows. Chaos in Physical Systems. Experimental Methods in Chaotic Vibrations. Criteria for Chaotic Vibrations. Fractals and Dynamical Systems. Spatiotemporal Chaos. Appendices. References. Author Index. Subject Index.

276 citations

Journal ArticleDOI
TL;DR: In this article, an experimental study on the onset of thermally induced two-phase flow oscillations has been carried out in a uniformly heated boiling channel using Freon-113 as the operating fluid.
Abstract: An experimental study on the onset of thermally induced two-phase flow oscillations has been carried out in a uniformly heated boiling channel using Freon-113 as the operating fluid. The effects of inlet subcooling, system pressure, inlet and exit restrictions, and inlet velocity have been studied. The experimental data have been compared with the equilibrium as well as the nonequilibrium theory including the effect of subcooled boiling. It has been found that the effect of thermal nonequilibrium should be included in a theoretical model for accurate prediction of the onset and the frequency of thermally induced flow oscillations. A simplified stability criterion has also been presented and compared with the experimental data.

149 citations