Download or read book Microscopic Understanding of Two Phase Heat Transfer on Engineered Surfaces written by Arif Rokoni and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-phase heat transfer is crucial for thermal management of electronic devices, power generation, refrigeration, and water desalination. The use of engineered surfaces can lead to significant improvement in heat dissipation capabilities in pool boiling applications due to the increased nucleation sites, elongated contact lines, increased bubble departure frequency, and microlayer evaporation via enhanced wicking, where the microlayer evaporation is the most dominant mechanism. Hierarchical surfaces demonstrate both significant and limited improvements in heat dissipation over micro-structured surfaces, where the microscopic understanding of wicking and thin-film evaporation is crucial. Nanostructures in hierarchical surfaces can achieve very large heat dissipation rates due to high capillary pressure, where the kinetic resistance across the Knudsen layer of the evaporating interface dictates the evaporation rates. The validity of using classical relations to estimate evaporation rate across the evaporating interface is questioned in recent experimental studies, that requires further investigations using atomic-scale study of evaporation across the interface. In addition, the complex nature of bubble dynamics during pool boiling on flat and engineered surfaces lead to several theoretical and experimental correlations but are substantially different from each other. With the advancement of computational capabilities and artificial intelligence (AI), data-driven deep learning (DL) approach has been heralded as an alternative to the conventional physics-based approach. In the present study, mathematical modeling, wicking, thin-film evaporation experiments, laser interferometry, and AI are utilized to address the unresolved issues mentioned above in two-phase heat transfer on engineered surfaces. First, the significance of micropatterns in wicking enhancement on hierarchical surfaces is demonstrated using microscopic in-house wicking experiments. A mathematical model to estimate the wicking performance for hierarchical surfaces is developed and extended to estimate the enhancement of thin-film evaporation over bare micropillar surfaces. The in-house wicking and thin-film evaporation experimental results are found to be in good agreement with the proposed model. Secondly, to verify the classical relations of evaporation across the liquid-vapor (L-V) interface, non-equilibrium molecular dynamics simulations are performed. The temperature jump and profile calculated across an evaporating L-V interface at various heat fluxes are found in good agreement with the classical theory predictions. To validate the simulation findings from thermodynamics point of view, atomistic interfacial entropy generation rates are calculated and found in qualitative agreement with the predictions from the non-equilibrium thermodynamics. Finally, to better understand the chaotic nature of bubble dynamics in pool boiling, principal component analysis (PCA) is used to extract dominant low dimensional features from pool boiling experimental images of bubble morphologies. The new physical descriptors, dominant frequency, and its amplitude, extracted from the present unsupervised machine learning are qualitatively compared to the bubble count and size extracted from a supervised deep-learning algorithm. This novel reduced-order analysis appears to be highly robust over multiple datasets and heater surfaces.

Download or read book Encyclopedia of Two phase Heat Transfer and Flow IV Boiling of CO2 and nanofluids written by John R. Thome and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamentals of Multiphase Heat Transfer and Flow written by Amir Faghri and published by Springer Nature. This book was released on 2019-09-13 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook presents a modern treatment of fundamentals of heat and mass transfer in the context of all types of multiphase flows with possibility of phase-changes among solid, liquid and vapor. It serves equally as a textbook for undergraduate senior and graduate students in a wide variety of engineering disciplines including mechanical engineering, chemical engineering, material science and engineering, nuclear engineering, biomedical engineering, and environmental engineering. Multiphase Heat Transfer and Flow can also be used to teach contemporary and novel applications of heat and mass transfer. Concepts are reinforced with numerous examples and end-of-chapter problems. A solutions manual and PowerPoint presentation are available to instructors. While the book is designed for students, it is also very useful for practicing engineers working in technical areas related to both macro- and micro-scale systems that emphasize multiphase, multicomponent, and non-conventional geometries with coupled heat and mass transfer and phase change, with the possibility of full numerical simulation.

Download or read book Microscale and Nanoscale Heat Transfer written by C.B. Sobhan and published by CRC Press. This book was released on 2008-06-12 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through analyses, experimental results, and worked-out numerical examples, Microscale and Nanoscale Heat Transfer: Fundamentals and Engineering Applications explores the methods and observations of thermophysical phenomena in size-affected domains. Compiling the most relevant findings from the literature, along with results from their own re

Download or read book Encyclopedia Of Two phase Heat Transfer And Flow I Fundamentals And Methods A 4 volume Set written by John R Thome and published by World Scientific. This book was released on 2015-08-14 with total page 1109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the two-set series is to present a very detailed and up-to-date reference for researchers and practicing engineers in the fields of mechanical, refrigeration, chemical, nuclear and electronics engineering on the important topic of two-phase heat transfer and two-phase flow. The scope of the first set of 4 volumes presents the fundamentals of the two-phase flows and heat transfer mechanisms, and describes in detail the most important prediction methods, while the scope of the second set of 4 volumes presents numerous special topics and numerous applications, also including numerical simulation methods.Practicing engineers will find extensive coverage to applications involving: multi-microchannel evaporator cold plates for electronics cooling, boiling on enhanced tubes and tube bundles, flow pattern based methods for predicting boiling and condensation inside horizontal tubes, pressure drop methods for singularies (U-bends and contractions), boiling in multiport tubes, and boiling and condensation in plate heat exchangers. All of these chapters include the latest methods for predicting not only local heat transfer coefficients but also pressure drops.Professors and students will find this 'Encyclopediaa of Two-Phase Heat Transfer and Flow' particularly exciting, as it contains authored books and thorough state-of-the-art reviews on many basic and special topics, such as numerical modeling of two-phase heat tranfser and adiabatic bubbly and slug flows, the unified annular flow boiling model, flow pattern maps, condensation and boiling theories, new emerging topics, etc.

Download or read book Theory and Fundamental Research in Heat Transfer written by J. A. Clark and published by Elsevier. This book was released on 2013-10-22 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theory and Fundamental Research in Heat Transfer focuses on the processes, methodologies, reactions, and mechanisms involved in heat transfer. The selection first offers information on thermal radiation characteristics of surfaces, including intensity of radiation, intensity of emission and angular emittance, reflectance relationships, diffuse reflector, hemispherical and total reflectances, reflectivity of homogeneous isotropic polished surfaces, and angular total remittance measurements. The text then takes a look at heat transfer in rarefied gas flow, as well as accommodation coefficient and free molecule transfer, near free molecule heat transfer, continuum heat transfer regimes, and transitional regime. The publication ponders on boiling heat transfer and plasma heat transfer. Turbulent heat transfer in stratified flow, thermal conductivity of solids, and studies on quantitative spectroscopy and gas emissivities are also discussed. Topics include emissivity calculations, mechanisms of thermal conductivity, and conductivity at low and intermediate temperatures. The selection is a dependable reference for readers interested in the processes, reactions, and mechanisms involved in heat transfer.

Download or read book Selected Problems in Fluid Flow and Heat Transfer written by Artur J. Jaworski and published by MDPI. This book was released on 2019-09-20 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid flow and heat transfer processes play an important role in many areas of science and engineering, from the planetary scale (e.g., influencing weather and climate) to the microscopic scales of enhancing heat transfer by the use of nanofluids; understood in the broadest possible sense, they also underpin the performance of many energy systems. This topical Special Issue of Energies is dedicated to the recent advances in this very broad field. This book will be of interest to readers not only in the fields of mechanical, aerospace, chemical, process and petroleum, energy, earth, civil ,and flow instrumentation engineering but, equally, biological and medical sciences, as well as physics and mathematics; that is, anywhere that “fluid flow and heat transfer” phenomena may play an important role or be a subject of worthy research pursuits.

Download or read book An Investigation Into Wetting and Two Phase Heat Transfer on Reetrant Textured Surfaces written by Edward Michael Mckenna and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: A novel pattern of undercut nano/microscopic surface features has been developed. These patterns feature simple hexagonally periodic surface composed of a Silicon stem and a thin Silicon Dioxide Cap. The first task of this work was to measure wetting properties including advancing, receding and sessile contact angles as well as breakthrough pressure. These results were used to create a model based on the fraction of the droplet periphery that wets the surface, as opposed to using the entire fraction of wetted surface area beneath a droplet. This model predicts contact angles more accurately than existing equations. These equations, specifically Cassie's and Wenzel's law, are in common use even though some of their basic underpinnings are debated to be fundamentally flawed. The results of this work will also act to clear up this ongoing debate. The second task was to test the hypothesis that these periodic undercut patterns could be used as a more efficient nucleate boiling surface due to vapor trapping and liquid entrainment into the network of structures. This type of liquid entrainment effect was expected to be similar to that previously proposed to explain the enhanced boiling on pore and tunnel type surfaces. However, these surfaces can be produced on a smaller scale, which adds to the liquid entrainment by enhancing capillary wicking. The result was a significant increase in critical heat flux due to small vortices pulling liquid into the surface. The parametric variations in the surfaces provided insight into the size scales that will maximize the intended effects. The influence of feature height, depth of undercut, cap thickness, size and spacing were all determined.

Download or read book Basic Mechanisms in Two phase Flow and Heat Transfer written by Paul H. Rothe and published by . This book was released on 1980 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Art of Measuring in the Thermal Sciences written by Josua Meyer and published by CRC Press. This book was released on 2020-11-05 with total page 483 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Art of Measuring in the Thermal Sciences provides an original state-of-the-art guide to scholars who are conducting thermal experiments in both academia and industry. Applications include energy generation, transport, manufacturing, mining, processes, HVAC&R, etc. This book presents original insights into advanced measurement techniques and systems, explores the fundamentals, and focuses on the analysis and design of thermal systems. Discusses the advanced measurement techniques now used in thermal systems Links measurement techniques to concepts in thermal science and engineering Draws upon the original work of current researchers and experts in thermal-fluid measurement Includes coverage of new technologies, such as micro-level heat transfer measurements Covers the main types of instrumentation and software used in thermal-fluid measurements This book offers engineers, researchers, and graduate students an overview of the best practices for conducting sound measurements in the thermal sciences.

Download or read book Annual Review of Heat Transfer written by Chang-Lin Tien and published by Begell House Publishers Inc.. This book was released on 1995-01-01 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat Transfer Essentials is a focused and concise one semester textbook with synchronized PowerPoint lectures, solutions and tutoring material designed for online posting. Its distinguishing features are: - Essential Topics. Critical elements ofheat transfer arejudicially selected and organized for coverage in a one semester introductory course. Topics include conduction, convection and radiation. - PowerPoint Lectures. PowerPoint presentations are synchronized with the textbook. This eliminates the need for lecture preparation and blackboard use by the instructor and note taking by students. - Interactive Classroom Environment. Eliminating blackboard use and note taking liberates both instructor and students. More time can be devoted to engaging students to encourage thinking and understanding through discussion and dialog. - Problem Solving Methodology. Students are drilled in a systematic and logical procedure for solving engineering problems. The book emphasizes though process, modeling, approximation, checking and evaluation of results. Students can apply this methodology in other courses as well as throughout their careers. - Special Problems. Mini-projects involving open ended design considerations and others requiring computer solutions are included. - Home Experiments. A unique set of simple heat transfer experiments designed to be cawied out at home are described. Comparing experimental results with theoretical predictions serves as an effective learning tool.. - Online Solutions Manual. Solutions to problems are intended to serve as an important learning instrument. They follow the problem solving methodology format and are designed for onlineposting. - Online Tutor. A summary of each chapter is prepared for posting. Key points and critical conditions are highlighted and emphasized. - Online Homework Facilitator. To assist students in solving homework problems, helpful hints and relevant observations are compiled for each problem. They can be selectively posted by the instructor. - Outstanding Title. The first edition was selected by Choice: Current Reviewsfor Academic Libraries among its outstanding titles in 2000.

Download or read book Advances in Numerical Heat Transfer Volume 2 written by W. Minkowycz and published by Routledge. This book was released on 2018-12-13 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume discusses the advances in numerical heat transfer modeling by applying high-performance computing resources, striking a balance between generic fundamentals, specific fundamentals, generic applications, and specific applications.

Download or read book Transport Phenomena in Multiphase Systems written by Amir Faghri and published by Academic Press. This book was released on 2006 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering students in a wide variety of engineering disciplines from mechanical and chemical to biomedical and materials engineering must master the principles of transport phenomena as an essential tool in analyzing and designing any system or systems wherein momentum, heat and mass are transferred. This textbook was developed to address that need, with a clear presentation of the fundamentals, ample problem sets to reinforce that knowledge, and tangible examples of how this knowledge is put to use in engineering design. Professional engineers, too, will find this book invaluable as reference for everything from heat exchanger design to chemical processing system design and more. * Develops an understanding of the thermal and physical behavior of multiphase systems with phase change, including microscale and porosity, for practical applications in heat transfer, bioengineering, materials science, nuclear engineering, environmental engineering, process engineering, biotechnology and nanotechnology * Brings all three forms of phase change, i.e., liquid vapor, solid liquid and solid vapor, into one volume and describes them from one perspective in the context of fundamental treatment * Presents the generalized integral and differential transport phenomena equations for multi-component multiphase systems in local instance as well as averaging formulations. The molecular approach is also discussed with the connection between microscopic and molecular approaches * Presents basic principles of analyzing transport phenomena in multiphase systems with emphasis on melting, solidification, sublimation, vapor deposition, condensation, evaporation, boiling and two-phase flow heat transfer at the micro and macro levels * Solid/liquid/vapor interfacial phenomena, including the concepts of surface tension, wetting phenomena, disjoining pressure, contact angle, thin films and capillary phenomena, including interfacial balances for mass, species, momentum, and energy for multi-component and multiphase interfaces are discussed * Ample examples and end-of-chapter problems, with Solutions Manual and PowerPoint presentation available to the instructors

Download or read book Natural and Engineered Surfaces for Enhanced Phase Change Heat Transfer written by Junho Oh and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Encyclopedia Of Two phase Heat Transfer And Flow Ii Special Topics And Applications A 4 volume Set written by John R Thome and published by World Scientific. This book was released on 2015-08-26 with total page 1321 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the two-set series is to present a very detailed and up-to-date reference for researchers and practicing engineers in the fields of mechanical, refrigeration, chemical, nuclear and electronics engineering on the important topic of two-phase heat transfer and two-phase flow. The scope of the first set of 4 volumes presents the fundamentals of the two-phase flows and heat transfer mechanisms, and describes in detail the most important prediction methods, while the scope of the second set of 4 volumes presents numerous special topics and numerous applications, also including numerical simulation methods.Practicing engineers will find extensive coverage to applications involving: multi-microchannel evaporator cold plates for electronics cooling, boiling on enhanced tubes and tube bundles, flow pattern based methods for predicting boiling and condensation inside horizontal tubes, pressure drop methods for singularies (U-bends and contractions), boiling in multiport tubes, and boiling and condensation in plate heat exchangers. All of these chapters include the latest methods for predicting not only local heat transfer coefficients but also pressure drops.Professors and students will find this 'Encyclopedia of Two-Phase Heat Transfer and Flow' particularly exciting, as it contains authored books and thorough state-of-the-art reviews on many basic and special topics, such as numerical modeling of two-phase heat transfer and adiabatic bubbly and slug flows, the unified annular flow boiling model, flow pattern maps, condensation and boiling theories, new emerging topics, etc.

Download or read book Advances in Cryogenic Engineering written by K.D. Timmerhaus and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1985 joint Cryogenic Engineering/International Cryogenic Materi als Conference was held on the campus of the Massachusetts Institute of Technology, Cambridge, Massachusetts. About 350 papers were presented at the joint conference on a wide variety of topics in cryogenic science and engineering. This volume of Advances in cryogenic Eogineerlng, the thirty-first in the series which began in 1954, contains most of the papers which were presented at the 1985 Cryogenic Engineering Conference. Each paper was rigorously peer reviewed to maintain the international reputation of Advances as the premier archival publication in the field of cryoscience, engineering, and technology. All the papers published in Volume 31 contain an abstract. A copy of the book will be sent to all maj or abstracting services, which should improve retrieval of the information contained in the published papers. I would like to thank the authors and those who served as reviewers. I especially appreciate the assistance of my colleague M. E. Stone who edited some of the papers for this volume. Terry Gutierrez was invaluable in preparing the manuscripts for publication, and I thank her. xvii DEDICATION Dr. Samuel C. Collins, Professor Emeritus of the Massachusetts Institute of Technology, internationally known as the father of practical helium liquefiers and founder of the MIT Cryogenic Engineering Laboratory, died on June 19, 1984, in George Washington University Hospital, Washington, DC.

Download or read book Advances in Mathematical and Computational Modeling of Engineering Systems written by Mukesh Kumar Awasthi and published by CRC Press. This book was released on 2023-02-20 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: The text covers a wide range of topics such as mathematical modeling of crop pest control management, water resources management, impact of anthropogenic activities on atmospheric carbon dioxide concentrations, impact of climate changes on melting of glaciers and polar bear populations, dynamics of slow–fast predator-prey system and spread and control of HIV epidemic. It emphasizes the use of mathematical modeling to investigate the fluid flow problems including the breaking of viscoelastic jet, instability arising in nanofiber, flow in an annulus channel, and thermal instability in nano-fluids in a comprehensive manner. This book will be a readily accessible source of information for the students, researchers and policymakers interested in the application of mathematical and computational modeling techniques to investigate various biological and engineering phenomena. Features Focuses on the current modeling and computational trends to investigate various ecological, epidemiological, and engineering systems. Presents the mathematical modeling of a wide range of ecological and environmental issues including crop pest control management, water resources management, the effect of anthropogenic activities on atmospheric carbon dioxide concentrations, and impact of climate changes on melting of glaciers and polar bear population. Covers a wide range of topics including the breaking of viscoelastic jet, instability arising in nanofiber, flow in an annulus channel, and thermal instability in nano-fluids. Examines evolutionary models i.e., models of time-varying processes. Highlights the recent developments in the analytical methods to investigate the nonlinear dynamical systems. Showcases diversified applications of computational techniques to solve practical biological and engineering problems. The book focuses on the recent research developments in the mathematical modeling and scientific computing of biological and engineering systems. It will serve as an ideal reference text for senior undergraduate, graduate students, and researchers in diverse fields including ecological engineering, environmental engineering, computer engineering, mechanical engineering, mathematics, and fluid dynamics.