Seeking Low Ice Adhesion

Seeking Low Ice Adhesion PDF

Author: John M. Sayward

Publisher:

Published: 1979

Total Pages: 92

ISBN-13:

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Icing impairs operation of helicopters and other aircraft, antennae, power and communication lines, shipping and superstructures, canal locks, etc. Prevention or easier removal of icing requires reduction of its adhesion strength. Literature study shows that adhesion results from secondary (van der Waals) forces yet exceeds normal cohesive strengths. It depends on free surface energy, low contact angle, good contact and wetting, cleanliness, and texture. Modes of adhesion testing are briefly discussed. Poor adhesion occurs with low energy surfaces or contaminants, e.g. hydrocarbons, fluorocarbons, waxes, oils, etc., particularly when textured or porous. The resulting low contact angle, poor wetting and occlusion of air at the interface weaken the bond or provide stress loci which can initiate cracks and failure. Coefficient of expansion differences may help in release of ice. Further ideas appear among the 100 abstracts presented. A survey of over 300 manufacturers produced over 100 replies. Half of them offered some 100 products deemed worth testing. These are listed with addresses and contacts.

Ice Adhesion

Ice Adhesion PDF

Author: K. L. Mittal

Publisher: John Wiley & Sons

Published: 2020-12-15

Total Pages: 704

ISBN-13: 1119640377

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This unique book presents ways to mitigate the disastrous effects of snow/ice accumulation and discusses the mechanisms of new coatings deicing technologies. The strategies currently used to combat ice accumulation problems involve chemical, mechanical or electrical approaches. These are expensive and labor intensive, and the use of chemicals raises serious environmental concerns. The availability of truly icephobic surfaces or coatings will be a big boon in preventing the devastating effects of ice accumulation. Currently, there is tremendous interest in harnessing nanotechnology in rendering surfaces icephobic or in devising icephobic surface materials and coatings, and all signals indicate that such interest will continue unabated in the future. As the key issue regarding icephobic materials or coatings is their durability, much effort is being spent in developing surface materials or coatings which can be effective over a long period. With the tremendous activity in this arena, there is strong hope that in the not too distant future, durable surface materials or coatings will come to fruition. This book contains 20 chapters by subject matter experts and is divided into three parts— Part 1: Fundamentals of Ice Formation and Characterization; Part 2: Ice Adhesion and Its Measurement; and Part 3: Methods to Mitigate Ice Adhesion. The topics covered include: factors influencing the formation, adhesion and friction of ice; ice nucleation on solid surfaces; physics of ice nucleation and growth on a surface; condensation frosting; defrosting properties of structured surfaces; relationship between surface free energy and ice adhesion to surfaces; metrology of ice adhesion; test methods for quantifying ice adhesion strength to surfaces; interlaboratory studies of ice adhesion strength; mechanisms of surface icing and deicing technologies; icephobicities of superhydrophobic surfaces; anti-icing using microstructured surfaces; icephobic surfaces: features and challenges; bio-inspired anti-icing surface materials; durability of anti-icing coatings; durability of icephobic coatings; bio-inspired icephobic coatings; protection from ice accretion on aircraft; and numerical modeling and its application to inflight icing.

Functional Coatings

Functional Coatings PDF

Author: Raj K. Arya

Publisher: John Wiley & Sons

Published: 2024-02-12

Total Pages: 628

ISBN-13: 1394207298

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FUNCTIONAL COATINGS A must-own resource for understanding functional coatings and their revolutionary potential Functional coatings are those which provide not only the protection and performance enhancement of a conventional coating, but also offer additional properties tailored to meet the specific requirements of a given industry or application. They have applications in a huge range of sectors, including automotive, aerospace, healthcare, energy, and more. Coatings with properties like fire retardancy, antimicrobial properties, or controlled drug release have the potential to revolutionize entire industries. Functional Coatings offers a comprehensive resource for engineers and researchers looking to understand these coatings and the opportunities they provide. Beginning with an overview of the subject’s foundations and industrial significance, the book analyzes numerous coating methods and their properties, with a particular focus on anticorrosion coatings. The result is an indispensable resource for professionals in virtually any technological industry looking to understand the benefits of a cutting-edge toolkit. Functional Coatings readers will also find: Coverage of synthesis, durability, reproducibility, cost-effectiveness, specialized surface morphology, and environmental friendliness of each coating Detailed discussion of antimicrobial coatings, fire-retardant coatings, self-healing coatings, nanopowder coatings, coatings for marine applications, and many more Applications of additives, machine learning, and sophisticated characterizations, etc. as per industry requirements Functional Coatings is ideal for researchers, engineers, and industry professionals working with any area of technology where coatings have purchase.

Techniques for Protecting Overhead Lines in Winter Conditions

Techniques for Protecting Overhead Lines in Winter Conditions PDF

Author: Masoud Farzaneh

Publisher: Springer Nature

Published: 2022-02-10

Total Pages: 400

ISBN-13: 3030874559

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This book offers a comprehensive review of the various options for improving the performance of overhead power lines in winter conditions, taking into account both mechanical and electrical aspects. Experience within the CIGRE community reveals many strategies to protect overhead power lines from damage caused by heavy build-up of ice and snow or electrical issues such as insulator icing flashovers. The initial approach is to consider the predicted ice loads from the available databases. This is supplemented with some fundamental aspects of icing physics that affect accretion rate as well as factors in ice shedding on traditional (metal, ceramic) and novel treated surfaces. These ice physics concepts structure the ways to categorize and evaluate methods to reduce or prevent icing on conductors and ground wires or to prevent flashover of insulators. Many utilities in cold climate regions have developed and used methods and strategies to reduce ice loads using anti-icing (AI) and / or de-icing (DI) methods. In general, AI methods are used before or early during ice build-up, while DI methods are activated during and sometimes after ice build-up. The book describes and discusses some historical, operational, or potential AI / DI systems in the ice physics context. This supports a comprehensive review of AI coatings including concepts, relevant material properties, application methods, and finally test methods for characterizing the long-term performance.

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports PDF

Author:

Publisher:

Published: 1979

Total Pages: 750

ISBN-13:

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

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