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Book Boiling Heat Transfer Phenomena During Rapid Decompression

Download or read book Boiling Heat Transfer Phenomena During Rapid Decompression written by Shin-Ping Kung and published by . This book was released on 1977 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Bubble Dynamics and Boiling Heat Transfer

Download or read book Bubble Dynamics and Boiling Heat Transfer written by Samuel Siedel and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since boiling heat transfer affords a very effective means to transfer heat, it is implemented in numerous technologies and industries ranging from large power generation plants to micro-electronic thermal management. Although having been a subject of research for several decades, an accurate prediction of boiling heat transfer is still challenging due to the complexity of the coupled mechanisms involved. It appears that the boiling heat transfer coefficient is intimately related to bubble dynamics (i.e. bubble nucleation, growth and detachment) as well as factors such as nucleation site density and interaction between neighbouring and successive bubbles. In order to contribute to the understanding of the boiling phenomenon, an experimental investigation of saturated pool boiling from a single or two neighbouring artificial nucleation sites on a polished copper surface has been performed. The bubble growth dynamics has been characterized for different wall superheats and a experimental growth law has been established. The interaction between successive bubbles from the same nucleation site has been studied, showing the bubble shape oscillations that can be caused by these interactions. The forces acting on a growing bubble has been reviewed, and a complete momentum balance has been made for all stages of bubble growth. The curvature along the interface has been measured, and indications concerning the mechanism of bubble detachment have been suggested. The rise of bubble after detachment has been investigated, and the maximum velocity reached before a change of direction has been estimated and compared to existing models from the literature. The interaction between bubbles growing side by side has been studied: the generation and propagation of a wave front during the coalescence of two bubbles has been highlighted. As boiling heat transfer enhancement techniques are being imagined and developed, this study also focuses on the electrohydrodynamic enhancement technique. Boiling experiments have been performed in the presence of electric fields, and their effects on heat transfer and bubble dynamics have been characterized. Although the volume of the bubbles at detachment and the relationship between the bubble frequency and the wall superheat were not affected, the bubble growth curve was modified. The bubbles were elongated in the direction of the electric field, and this elongation was estimated and compared to other studies from the literature. The rising velocity of the bubble was reduced in the presence of electric field, and the behaviour of bubbles growing side by side was modified, the electric field causing the bubbles to repeal each other. These results, obtained in a fully controlled environment, provide compelling evidence that electric fields can be implemented to alter the bubble dynamics and subsequently heat transfer rates during boiling of dielectric fluids.

Book Bubble Systems

Download or read book Bubble Systems written by Alexander A. Avdeev and published by Springer. This book was released on 2016-04-29 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph presents a systematic analysis of bubble system mathematics, using the mechanics of two-phase systems in non-equilibrium as the scope of analysis. The author introduces the thermodynamic foundations of bubble systems, ranging from the fundamental starting points to current research challenges. This book addresses a range of topics, including description methods of multi-phase systems, boundary and initial conditions as well as coupling requirements at the phase boundary. Moreover, it presents a detailed study of the basic problems of bubble dynamics in a liquid mass: growth (dynamically and thermally controlled), collapse, bubble pulsations, bubble rise and breakup. Special emphasis is placed on bubble dynamics in turbulent flows. The analysis results are used to write integral equations governing the rate of vapor generation (condensation) in non-equilibrium flows, thus creating a basis for solving a number of practical problems. This book is the first to present a comprehensive theory of boiling shock with applications to problems of critical discharge and flashing under the fast decompression conditions. Reynolds’ analogy was the key to solving a number of problems in subcooled forced-flow boiling, the theoretical results of which led to easy-to-use design formulas. This book is primarily aimed at graduate and post-graduate students specializing in hydrodynamics or heat and mass transfer, as well as research expert focused on two-phase flow. It will also serve as a comprehensive reference book for designers working in the field of power and aerospace technology.

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1981 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Bubble Growth Dynamics in Boiling

Download or read book Bubble Growth Dynamics in Boiling written by Anthony James Robinson and published by . This book was released on 2003 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanisms which govern the growth of a spherical vapour bubble in an unbounded liquid were exposed by investigating the complex interaction between the heat transfer and the fluid flow surrounding a bubble as it grows from inception, through the various growth stages, to diffusion controlled growth. The influence of system pressure and liquid superheat were also investigated.

Book Dynamics and Control of Energy Systems

Download or read book Dynamics and Control of Energy Systems written by Achintya Mukhopadhyay and published by Springer Nature. This book was released on 2019-10-14 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent advances in dynamics and control of different types of energy systems. It covers research on dynamics and control in energy systems from different aspects, namely, combustion, multiphase flow, nuclear, chemical and thermal. The chapters start from the basic concepts so that this book can be useful even for researchers with very little background in the area. A dedicated chapter provides an overview on the fundamental aspects of the dynamical systems approach. The book will be of use to researchers and professionals alike.

Book Bubble Dynamics in Nucleate Boiling Heat Transfer

Download or read book Bubble Dynamics in Nucleate Boiling Heat Transfer written by Ritchie Deane Mikesell and published by . This book was released on 1958 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Paper

Download or read book Paper written by and published by . This book was released on 1981 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Bubble Growth Rate and Heat Transfer Suppression in the Flow Boiling of Binary Mixtures

Download or read book Bubble Growth Rate and Heat Transfer Suppression in the Flow Boiling of Binary Mixtures written by Taavo Raykoff and published by . This book was released on 1996 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: "An investigation is undertaken into the nature of the bubble growth rate and heat transfer suppression in the flow boiling of binary mixtures. From an examination of the well established pool boiling theory available in the literature and a consideration of factors uniquely present in flow boiling situations, it is determined that the present pool boiling theories are roughly applicable for a finite initial interval of the bubble growth cycle during flow boiling. Furthermore, it is hypothesized that the suppression of the increase in heat transfer coefficient in binary fluids which occurs after the onset of nucleate boiling is related to the suppression in bubble growth rates. Experimental data of bubble growth rate and heat transfer coefficient for flow boiling of a binary mixture of ethylene glycol and water at various conditions is acquired, and tested relative to these conclusions. The results are in agreement within the experimental range of uncertainty."--Abstract.

Book Heat Transfer and Vapor Bubble Dynamics in Forced Convective Boiling

Download or read book Heat Transfer and Vapor Bubble Dynamics in Forced Convective Boiling written by Glen Thorncroft and published by . This book was released on 2019-05-31 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissertation Discovery Company and University of Florida are dedicated to making scholarly works more discoverable and accessible throughout the world. This dissertation, "Heat Transfer and Vapor Bubble Dynamics in Forced Convective Boiling" by Glen Edward Thorncroft, was obtained from University of Florida and is being sold with permission from the author. A digital copy of this work may also be found in the university's institutional repository, IR@UF. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation.

Book Bubble Dynamics and Heat Transfer in Pool Boiling on Wires at Different Gravity

Download or read book Bubble Dynamics and Heat Transfer in Pool Boiling on Wires at Different Gravity written by Jian-Fu Zhao and published by . This book was released on 2011 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of experimental studies on bubble dynamical behaviors and heat transfer in pool boiling on thin wires in different gravity conditions have been performed in the past years, including experiments in long-term microgravity aboard the 22nd Chinese recoverable satellite RS-22, in short-term microgravity in the drop tower Beijing, and in normal gravity on the ground. Steady pool boiling of degassed R113 on thin platinum wires has been studied using a temperature-controlled heating method. A voltage-controlled heating method has also been used in normal gravity. A slight enhancement of nucleate boiling heat transfer is observed in microgravity, while dramatic changes of bubble behaviors are very evident. Considering the influence of the Marangoni effects, the different characteristics of bubble behaviors in microgravity have been explained. A new bubble departure model including the influence of the Marangoni effects has also been proposed, which can predict the whole observation both in microgravity and in normal gravity. The value of CHF (critical heat flux) in microgravity is lower than that in normal gravity, but it can be predicted well by the Lienhard-Dhir correlation, although the dimensionless radius, or the square root of the Bond number, in the present case is far beyond its initial application range. A further revisit on the scaling of CHF with heater radius in normal gravity, which is focused on the case of a small Bond number, has also been performed in our laboratory using different kinds of working fluids at different subcooling conditions. Interactions between the influences of the subcooling and heater radius will be important for the case of a small Bond number. In addition to the Bond number, there may exist some other parameters, which may be material-dependent, that play important roles in the CHF phenomenon with a small Bond number.

Book Cavitation and Bubble Dynamics

Download or read book Cavitation and Bubble Dynamics written by Christopher E. Brennen and published by Cambridge University Press. This book was released on 2014 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavitation and Bubble Dynamics deals with fundamental physical processes of bubble dynamics and cavitation for graduate students and researchers.

Book Multiphase Flow Dynamics 1

Download or read book Multiphase Flow Dynamics 1 written by Nikolay Ivanov Kolev and published by Springer. This book was released on 2015-04-20 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: In its fifth extended edition the successful monograph package “Multiphase Flow Dynamics” contains theory, methods and practical experience for describing complex transient multi-phase processes in arbitrary geometrical configurations, providing a systematic presentation of the theory and practice of numerical multi-phase fluid dynamics. In the present first volume the local volume and time averaging is used to derive a complete set of conservation equations for three fluids each of them having multi components as constituents. Large parts of the book are devoted on the design of successful numerical methods for solving the obtained system of partial differential equations. Finally the analysis is repeated for boundary fitted curvilinear coordinate systems designing methods applicable for interconnected multi-blocks. This fifth edition includes various updates, extensions, improvements and corrections, as well as a completely new chapter containing the basic physics describing the multi-phase flow in turbines, compressors, pumps and other rotating hydraulic machines.