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This thesis investigates the use of three classes advanced materials for promoting dropwise condensation: 1. robust hydrophobic functionalizations 2. superhydrophobic textures 3. lubricant-imbibed textures We first define the functional requirements of a hydrophobic functionalization for promoting dropwise condensation and use these guidelines to investigate two subclasses of materials: rare-earth ceramics and fluoropolymer films deposited via initiated chemical vapor deposition (iCVD). We show how both materials exhibit robust dropwise behavior, and further subject an iCVD film to an accelerated endurance trial to show how it sustains dropwise condensation throughout a 3-month equivalent trial. Next we combine hydrophobic functionalization with rough texture to obtain superhydrophobic surfaces and identify a self-similar depinning mechanism governing adhesion on surfaces with multiple roughness length scales. We introduce the metric of pinned fraction to show how these surfaces must be designed to minimize adhesion. We then show how dropwise condensation on superhydrophobic surfaces and the ensuing "jumping" behavior consists of not only binary coalescences, but multiple-drop coalescences with tangential departure that result in increased departing mass flux. However, we find that although this mode of condensation is readily achievable when condensing working fluids with high surface tension, such as water, even re-entrant structures that are known to support millimetric droplets of low-surface tension liquids in a superhydrophobic state are not sufficient to promote the dropwise mode of condensation for working fluids with low surface tension. Finally, we extend the applicability of textured surfaces by imbibing solid textures with a lubricant stabilized by capillary wicking. We show how these surfaces, when both solid texture and lubricant are properly designed, can promote dropwise condensation and reduce departing diameter of not only steam, but also of low-surface tension working fluids. In summary, we find that all three classes of surfaces provide significant increases in vapor-side heat transfer coefficient. However, when considering the overall heat transfer coefficient of a surface condenser, we find that most of the benefits of dropwise condensation can be realized by hydrophobic functionalization.
Advanced Materials-based Thermally Enhanced Phase Change Materials: Fundamentals and Applications focuses on the use of advanced materials to enhance the thermal characteristics of phase change materials used to maximize heat transfer rate and thermal storage capability of PCMs. This book covers the various aspects of PCMs through characteristics and preparation to heat transfer enhancement with emphasis on prominent applications. This book will progress from cover brief history, literature review, definitions, recent advances, preparation techniques, thermophysical properties and heat transfer characteristics with mathematical models, performance-affecting factors, and applications and challenges of PCMs in manufacturing. A powerful tool for researchers and energy engineers, Advanced Materials-based Thermally Enhanced Phase Change Materials: Fundamentals and Applications offers cutting-edge materials advances, analysis and applications of phase change materials in manufacturing. Provides an in-depth explanation of phase change materials (PCMs), heat transfer, and thermal characteristics and applications Covers applications and challenges for commercialization Explores advanced materials such as nanoparticles, graphene, carbon nanotubes, MXene, metallic foams, and micro fins
September 04-06, 2018 Zurich, Switzerland Key Topics: Advanced Functional Materials, Advanced Optical Materials, Advanced Bio-Materials & Bio-devices, Polymers Science and Engineering, Emerging Areas of Materials Science, Advanced Ceramics and Composite Materials, Advancement in Nanomaterials Science and Nanotechnology, Carbon Based Materials, Materials Science and Engineering, Metals & Metallurgy, Entrepreneurs Investment Meet, Energy Materials and Harvesting, Advanced Computational Materials, Constructional and Engineering Materials, Environmental and Green Materials, Structural Materials, Biosensor and Bio-electronic Materials, Materials Physics, Materials Chemistry, Advanced Materials Engineering, Coatings and Surface Engineering,
Approx.326 pages Summarizes heat transfer characteristics of nanofluids Addresses factors that affect the properties of heat transfer Includes applications and challenges of commercialization
Advanced Materials-Based Fluids for Thermal Systems focuses on new advanced materials called nanofluids that can be used to maximize heat transfer rates by adding nanoparticles (nanocomposites) into conventional heat transfer fluids. This comprehensive resource covers fundamentals, brief history, definitions, literature review, an introduction to thermophysical properties, and heat transfer characteristics with mathematical models, techniques, performance-affecting factors, applications, and challenges of hybrid nanofluids. The book includes thermal characteristics, measurement, design, and applications of nanoparticles, as well as up-to-date advances in thermal engineering. Sections cover basics then advance to major topics with mathematical models, schematic diagrams, and summaries of experimental work of different researchers. The book also summarizes previous research and contemporary advances on nanofluids worldwide and introduces new techniques, resolving existing problems, and includes tactics on the implementation in practical applications.
Materials for Advanced Heat Transfer Systems presents the latest research and technologies developed for high-performance materials in heat transfer and cooling. The book compiles sought after research academics and industry experts need to adopt to solve common problems in critical areas of heat transfer and cooling to help advance the field further. A variety of methodologies are included to synthesize the material used, along with the correct procedures to follow to ensure appropriate and effective use. Various case studies are presented to help the reader further understand the benefits and challenges of the materials discussed. Researchers, academics, students and engineers working on heat transfer systems will benefit from this interdisciplinary and applications-focused reference and be guided through various methodologies to make informed decisions based on the latest research and technologies available. Presents current and futuristic materials that are being synthesized or used for improving heat transfer mechanisms of a system Applies the technologies, models and methods to a variety of applications, including power generation, aerospace, electronics and automobiles Includes recent case studies which exemplify the concepts and technologies analyzed
The need for advanced thermal management materials in electronic packaging has been widely recognized as thermal challenges become barriers to the electronic industry’s ability to provide continued improvements in device and system performance. With increased performance requirements for smaller, more capable, and more efficient electronic power devices, systems ranging from active electronically scanned radar arrays to web servers all require components that can dissipate heat efficiently. This requires that the materials have high capability of dissipating heat and maintaining compatibility with the die and electronic packaging. In response to critical needs, there have been revolutionary advances in thermal management materials and technologies for active and passive cooling that promise integrable and cost-effective thermal management solutions. This book meets the need for a comprehensive approach to advanced thermal management in electronic packaging, with coverage of the fundamentals of heat transfer, component design guidelines, materials selection and assessment, air, liquid, and thermoelectric cooling, characterization techniques and methodology, processing and manufacturing technology, balance between cost and performance, and application niches. The final chapter presents a roadmap and future perspective on developments in advanced thermal management materials for electronic packaging.
Since the petroleum crisis in the 1970s, a lot of effort to save energy was made in industry, and remarkable achievements have been made. In the research and development concerning thermal energy, however, it was clar ified that one of the most important problems was manufacturing con densing systems with smaller size and higher performance. To solve this problem we need a method which synthesizes selections_ of the type of con denser, cooling tube and its arrangement, assessment of fouling on the cooling surfaces, consideration of transient characteristics of a condenser, etc. The majority of effort, however, has been to devise a surface element which enhances the heat transfer coefficient in condensation of a single or multicomponent vapor. Condensation phenomena are complexly affected by a lot of physical property values, and accordingly the results of theo retical research are expressed with several dimensionless parameters. On the other hand, the experimental research is limited to those with some specified cooling surfaces and some specified working fluids. Hence, the basic research of condensation is necessary for criticizing the enhancement effect as well as for an academic interest.
This book presents contributions from renowned experts addressing research and development related to the two important areas of heat exchangers, which are advanced features and applications. This book is intended to be a useful source of information for researchers, postgraduate students, academics, and engineers working in the field of heat exchangers research and development.
Surface sciences elucidate the physical and chemical aspects of the surfaces and interfaces of materials. Of great interest in this field are nanomaterials, which have recently experienced breakthroughs in synthesis and application. As such, this book presents some recent representative achievements in the field of surface science, including synthesis techniques, surface modifications, nanoparticle-based smart coatings, wettability of different surfaces, physics/chemistry characterizations, and growth kinetics of thin films. In addition, the book illustrates some of the important applications related to silicon, CVD graphene, graphene oxide, transition metal dichalcogenides, carbon nanotubes, carbon nanoparticles, transparent conducting oxide, and metal oxides.