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Author : James R. Gaier
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (13 download)
Download or read book Implications of Adhesion Studies for Dust Mitigation on Thermal Control Surfaces written by James R. Gaier and published by . This book was released on 2012 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781794357358
Total Pages : 28 pages
Book Rating : 4.3/5 (573 download)
Download or read book Implications of Adhesion Studies for Dust Mitigation on Thermal Control Surfaces written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-18 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments measuring the adhesion forces under ultrahigh vacuum conditions (10 (exp -10) torr) between a synthetic volcanic glass and commonly used space exploration materials have recently been described. The glass has a chemistry and surface structure typical of the lunar regolith. It was found that Van der Waals forces between the glass and common spacecraft materials was negligible. Charge transfer between the materials was induced by mechanically striking the spacecraft material pin against the glass plate. No measurable adhesion occurred when striking the highly conducting materials, however, on striking insulating dielectric materials the adhesion increased dramatically. This indicates that electrostatic forces dominate over Van der Waals forces under these conditions. The presence of small amounts of surface contaminants was found to lower adhesive forces by at least two orders of magnitude, and perhaps more. Both particle and space exploration material surfaces will be cleaned by the interaction with the solar wind and other energetic processes and stay clean because of the extremely high vacuum (10 (exp -12) torr) so the atomically clean adhesion values are probably the relevant ones for the lunar surface environment. These results are used to interpret the results of dust mitigation technology experiments utilizing textured surfaces, work function matching surfaces and brushing. They have also been used to reinterpret the results of the Apollo 14 Thermal Degradation Samples experiment. Gaier, James R. and Berkebile, Stephen P. Glenn Research Center NASA/TM-2012-217213, AIAA Paper-2012-0875, E-18114
Author : Nasa Technical Reports Server (Ntrs)
Publisher : BiblioGov
ISBN 13 : 9781289164904
Total Pages : 26 pages
Book Rating : 4.1/5 (649 download)
Download or read book Implications of Adhesion Studies for Dust Mitigation on Thermal Control Surfaces written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments measuring the adhesion forces under ultrahigh vacuum conditions (10 (exp -10) torr) between a synthetic volcanic glass and commonly used space exploration materials have recently been described. The glass has a chemistry and surface structure typical of the lunar regolith. It was found that Van der Waals forces between the glass and common spacecraft materials was negligible. Charge transfer between the materials was induced by mechanically striking the spacecraft material pin against the glass plate. No measurable adhesion occurred when striking the highly conducting materials, however, on striking insulating dielectric materials the adhesion increased dramatically. This indicates that electrostatic forces dominate over Van der Waals forces under these conditions. The presence of small amounts of surface contaminants was found to lower adhesive forces by at least two orders of magnitude, and perhaps more. Both particle and space exploration material surfaces will be cleaned by the interaction with the solar wind and other energetic processes and stay clean because of the extremely high vacuum (10 (exp -12) torr) so the atomically clean adhesion values are probably the relevant ones for the lunar surface environment. These results are used to interpret the results of dust mitigation technology experiments utilizing textured surfaces, work function matching surfaces and brushing. They have also been used to reinterpret the results of the Apollo 14 Thermal Degradation Samples experiment.
Author : Stephen Berkebile
Publisher : BiblioGov
ISBN 13 : 9781289168285
Total Pages : 24 pages
Book Rating : 4.1/5 (682 download)
Download or read book Adhesion Between Volcanic Glass and Spacecraft Materials in an Airless Body Environment written by Stephen Berkebile and published by BiblioGov. This book was released on 2013-07 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The successful exploration of airless bodies, such as the Earth s moon, many smaller moons of the outer planets (including those of Mars) and asteroids, will depend on the development and implementation of effective dust mitigation strategies. The ultrahigh vacuum environment (UHV) on the surfaces of these bodies, coupled with constant ion and photon bombardment from the Sun and micrometeorite impacts (space weathering), makes dust adhesion to critical spacecraft systems a severe problem. As a result, the performance of thermal control surfaces, photovoltaics and mechanical systems can be seriously degraded even to the point of failure. The severe dust adhesion experienced in these environments is thought to be primarily due to two physical mechanisms, electrostatic attraction and high surface energies, but the dominant of these has yet to be determined. The experiments presented here aim to address which of these two mechanisms is dominant by quantifying the adhesion between common spacecraft materials (polycarbonate, FEP and PTFE Teflon, (DuPont) Ti-6-4) and a synthetic noritic volcanic glass, as a function of surface cleanliness and triboelectric charge transfer in a UHV environment. Adhesion force has been measured between pins of spacecraft materials and a plate of synthetic volcanic glass by determining the pull-off force with a torsion balance. Although no significant adhesion is observed directly as a result of high surface energies, the adhesion due to induced electrostatic charge is observed to increase with spacecraft material cleanliness, in some cases by over a factor of 10, although the increase is dependent on the particular material pair. The knowledge gained by these studies is envisioned to aid the development of new dust mitigation strategies and improve existing strategies by helping to identify and characterize mechanisms of glass to spacecraft adhesion for norite volcanic glass particles.
Author : Stephen Berkebile
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (824 download)
Download or read book Adhesion in a vacuum environment and its implications for dust mitigation techniques on airless bodies written by Stephen Berkebile and published by . This book was released on 2012 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anatoliǐ Davydovich Zimon
Publisher : Springer
ISBN 13 : 1489966005
Total Pages : 429 pages
Book Rating : 4.4/5 (899 download)
Download or read book Adhesion of Dust and Powder written by Anatoliǐ Davydovich Zimon and published by Springer. This book was released on 2013-12-11 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. L. Mittal
Publisher : John Wiley & Sons
ISBN 13 : 1119640377
Total Pages : 704 pages
Book Rating : 4.1/5 (196 download)
Download or read book Ice Adhesion written by K. L. Mittal and published by John Wiley & Sons. This book was released on 2020-12-15 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author :
Publisher :
ISBN 13 :
Total Pages : 534 pages
Book Rating : 4.3/5 (91 download)
Download or read book Lunar Surface Studies written by and published by . This book was released on 1962 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Amir Al-Ahmed
Publisher : Springer Nature
ISBN 13 : 3030846350
Total Pages : 318 pages
Book Rating : 4.0/5 (38 download)
Download or read book The Effects of Dust and Heat on Photovoltaic Modules: Impacts and Solutions written by Amir Al-Ahmed and published by Springer Nature. This book was released on 2021-11-01 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses how to reduce the impact of dust and heat on photovoltaic systems. It presents the problems caused by both dust accumulation and heat on PV systems, as well as the solutions, in a collected piece of literature. The Effects of Dust and Heat on Photovoltaic Modules: Impacts and Solutions begins by discussing the properties of dust accumulation on PV modules. It then presents several solutions to this, such as hydrophobic coatings and surface texturing. The second half of the book is used to discuss the effects of heat on silicon PV modules, as well as various cooling approaches. These include water cooling and carbon-based materials. Due to the prevalence of PV systems in renewable energy, this book will be of interest to numerous students, researchers and practitioners.
Author : Joel S. Levine
Publisher : Cambridge Scholars Publishing
ISBN 13 : 1527564428
Total Pages : 303 pages
Book Rating : 4.5/5 (275 download)
Download or read book The Impact of Lunar Dust on Human Exploration written by Joel S. Levine and published by Cambridge Scholars Publishing. This book was released on 2021-01-12 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: When the Apollo 11 astronauts landed on the Moon on July 20, 1969, they made a very important discovery. During their landing on the surface of the Moon, the exhaust gases released from the Lunar Module landing rockets caused large amounts of surface dust to move into the thin lunar atmosphere, causing obscuration of the lunar surface. Once they landed, they found that the surface of the Moon was covered with several inches of very fine, tiny particles composed of sharp, glassy material. The lunar dust stuck to everything it came in contact with, and, once on the lunar surface, the dust eroded their spacesuits, caused overheating on equipment and instrumentation, compromised seals on their spacesuits and on lunar sample collecting boxes, irritated their eyes and lungs, and generally coated everything very efficiently. On the return to Earth in the Apollo Command Module, lunar dust inadvertently brought aboard floated freely in their cabin causing problems. Now, 50 years later, humans will return to the Moon in the Artemis Program, as early as 2024. This book summarizes what we know about lunar dust, its structure and chemical composition, its impact on human health, and how to reduce/mitigate its effects on future human exploration. The four dozen contributors to the 14 chapters in the book are planetary scientists, engineers, mission planners, medical researchers and physicians from NASA and the European Space Agency (ESA), as well as universities and industry from the United States, Australia, Germany, Italy, the Netherlands, Portugal and Sweden.
Author : Anatoliǐ Davydovich Zimon
Publisher : Springer
ISBN 13 : 9781489962768
Total Pages : 413 pages
Book Rating : 4.9/5 (627 download)
Download or read book Adhesion of Dust and Powder written by Anatoliǐ Davydovich Zimon and published by Springer. This book was released on 1969-01-01 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. D. Zimon
Publisher :
ISBN 13 : 9781489966018
Total Pages : 440 pages
Book Rating : 4.9/5 (66 download)
Download or read book Adhesion of Dust and Powder written by A. D. Zimon and published by . This book was released on 2014-09-01 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nima Gharib
Publisher : Elsevier
ISBN 13 : 0128219750
Total Pages : 272 pages
Book Rating : 4.1/5 (282 download)
Download or read book Electrostatic Dust Mitigation and Manipulation Techniques for Planetary Dust written by Nima Gharib and published by Elsevier. This book was released on 2022-08-24 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrostatic Dust Mitigation and Manipulation Techniques for Planetary Dust explains how to control and remove dust in space due to the presence of a vacuum, abrasiveness of dust particles and electrostatic charge on particles. The book introduces innovative technologies that use electrostatic and di-electrophoretic forces to remove and transport small particles away from surfaces. In addition, it discusses how to resolve thermal control problems and reduce lung inhalation and eye irritation problems. The book includes two abrasive wear test devices that were designed to study the rate of volume wear for di?erent materials when subjected to lunar dust simulant of di?erent size ranges. This will be an ideal resource for space system engineers, space exploration researchers, and advanced students and professionals in space engineering. Provides a comprehensive background on lunar and Martian dust properties and challenges, comparing currently available mitigation strategies Highlights problems from dust on various space systems and crew Features discrete element models that were created and calibrated based on experimental results to study the capacity of this technique for removing and cleaning dust in the lunar environments and on Earth
Author : ZIMON ANATOLII D.
Publisher : Springer
ISBN 13 : 9780306303913
Total Pages : 424 pages
Book Rating : 4.3/5 (39 download)
Download or read book Adhesion of Dust and Powder written by ZIMON ANATOLII D. and published by Springer. This book was released on 1995-12-31 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 782 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA SP. written by and published by . This book was released on 1964 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David J. Quesnel
Publisher : CRC Press
ISBN 13 : 9789056997250
Total Pages : 546 pages
Book Rating : 4.9/5 (972 download)
Download or read book Particle Adhesion written by David J. Quesnel and published by CRC Press. This book was released on 2002-02-07 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whenever a curved surface interacts with another surface, the principles of adhesion are at work. From the cells in your body to the dust on your glasses, intermolecular forces cause materials to attract one another. Elastic deformations resulting from these adhesive interactions store strain that can be liberated during particle detachment. Time dependent changes in adhesion can result from plastic deformation that both increases the real effective contact area and reduces the stored energy available to assist in particle removal. Processes such as these, based on the fundamentals tenets of particle adhesion, are now finding applications across many disciplines leading to a rich and rapid development of knowledge. This book documents the use of particle adhesion concepts in a variety of disciplines. Fields as varied as the cleaning of semiconductors, to the controlling of cancer metastasis, to the abatement of environmental pollution all benefit from applications of particle adhesion concepts.
Author : James R. Bates
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.F/5 ( download)
Download or read book ALSEP Termination Report written by James R. Bates and published by . This book was released on 1979 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
