Last edited by Gamuro
Tuesday, August 11, 2020 | History

2 edition of Liquid lubrication in space found in the catalog.

Liquid lubrication in space

Erwin V. Zaretsky

Liquid lubrication in space

by Erwin V. Zaretsky

  • 252 Want to read
  • 22 Currently reading

Published by NASA in Washington, D.C .
Written in English


Edition Notes

StatementErwin V. Zaretsky.
SeriesNASA reference publication -- 1240
ContributionsUnited States. National Aeronautics and Space Administration. Scientific and Technical Information Division.
ID Numbers
Open LibraryOL13941496M

LUBRICANTS IN SPACE Lubricants for aerospace applications have been formulated at Nye for over 65 years. Below is a demonstration of Nye’s space heritage, including some examples of lubricants designed specifically for applications that must survive the severe conditions of the space environment. Lubrication, introduction of any of various substances between sliding surfaces to reduce wear and friction. Nature has been applying lubrication since the evolution of synovial fluid, which lubricates the joints and bursas of vertebrate animals. Prehistoric people used mud and reeds to lubricate.

Based on the end-face mechanical seal in Space Liquid Lubrication System, a geometry model of hydrophobic surface was presented. The Reynolds equation for controlling film pressure between the faces of micro-sculpt was solved by using the finite element method. The influence rules on end-face film pressure were studied in the surfaces of zero sculpt, micron positive (protruding) and micron Author: Fen Zhu Ji, Fa Rong Du, Bin Xu, Shi Chun Yang. In addition, as a grease, ionic-liquid-type grease has superior boundary lubrication capacity in a vacuum compared to systems of PFPE and MAC. Regarding research on radiation for utilization in space, ionic liquid has been verified to have radiation by:

The automotive lubricants arena has undergone significant changessince the first edition of this book was published in Environmental concerns, particularly reagarding improvement of arquality have been important in recent years, Reduced emmissions aredirectly related to changes in lubricant specifications andquality, and the second edition of the Automotive LubricantsReference Book 4/5(4). The gravity oil feed method dose not suit for microgravity environment as the same way dose for ground lubrication system. It is the key problem to be solved that how to supply the oil to friction surface in space liquid lubrication system. It analyzed the lubricating manner. A space liquid lubrication system was designed based on a principle of using deformation energy to supply : Fen Zhu Ji, Yu Chen Guo, Fa Rong Du, Shu Chun Yang, Bin Xu.


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Liquid lubrication in space by Erwin V. Zaretsky Download PDF EPUB FB2

Liquid lubrication in space. Washington, D.C.: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Erwin V Zaretsky.

boundary lubrication is not sharp, and there exists a region, called the mixed lubrication regime, which consists of some elastohydrodynamic and some boundary lubrication. Other Factors Affecting Liquid Lubrication Many factors influence liquid lubrication besides viscosity, speed, and load.

Probably the most influential parameter is temperature. This handbook is intended to provide a ready reference for many of the solid and liquid lubricants used in the space industry. Lubricants and lubricant properties are arranged systematically so that designers, engineers, and maintenance personnel.

Liquid lubrication systems are generally used for mission life requirements of over a year, (Ahlborn et al. The application of liquid lubricants in the space environment presents unique challenges.

This report reviews the state of the art of liquid lubrication in space as well as the problems and their solutions. Lubrication Lubrication was applied to the balls only. Liquid lubrication was achieved through the preparation of a solution of lubricant diluted in an appropriate solvent, of a known concentration.

This solution was applied directly to a rotating ball, and the solvent allowed to evaporate from the ball’s surface. The amount ofCited by: 2.

Reviewed here is the state of the art of liquid lubrication for space applications. The areas discussed are types of liquid lubrication mechanisms, space environmental effects on lubrication.

Liquid and solid lubricating mechanisms are discussed, along with the various other factors affecting lubrication in a space environment.

The author also considers the advantages and disadvantages of solid and liquid lubricants for these : NASA Lewis Research Center Robert L. Fusaro. Traditional oil-based liquid lubricants either burn up, freeze or evaporate in outer space.

Like liquid lubricants, molybdenum disulfide and other solid lubricants serve as a buffer between. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Lubrication reduces friction between the moving surfaces or rolling pairs. Some of the various types include hydrodynamic, hydrostatic, boundary and extreme pressure lubrication.

The lubricant also act as a coolant carrying heat away from the sliding surfaces so it is necessary for all the moving parts in machinery or engine operation.

Engineering Lubrication Design Data. Lubrication handbook for the space industry. Part A: Solid lubricants. Part B: Liquid lubricants. Premium Membership Required to view Document/Book. Open: Space Industry Lubrication. This handbook is intended to provide a ready reference for many of the solid and liquid lubricants used in the space industry.

The early chapters provide a thorough discussion of classical tribological theory. The remainder of the book is devoted to more advanced topics of inertia, thermal and turbulence effects, lubrication of counterformal contacts, and non-Newtonian lubricants.

Also included are developing areas, such as lubrication with by: Liquid lubrication in space E. Zaretsky* Long-term reliable operational requirements of aerospace mechanisms have, with a few exceptions, furthered the state of the art in tribology.

Space mission durations in the early s were generally six months to a by: "Lubrication of Space Systems" NASA TM, (1 Mb) Robert L. Fusaro and Michael M. Khonsari "Liquid Lubrication for Space Applications" NASA TM, (2 Mb) William R.

Loomis and Robert L. Fusaro "Liquid Lubricants for Advanced Aircraft Engines" NASA TM, (1 Mb) Robert L. Fusaro. The solid lubricants used in the present study were applied by spraying or roll coating to a thickness of between ” and ”. All forming lubricants applied are the solid lubricants which have been suspended in a liquid medium for spraying or roll coating.

The solid lubricants as shown in Table 2 include: milk of magnesia (Mg(OH) 2), graphite, molybdenum (Moly) disulfide, boron. @article{osti_, title = {Fluid film lubrication}, author = {Gross, W A and Matsch, L A and Castelli, V and Eshel, A and Vohr, J H and Wildmann, M}, abstractNote = {The purpose of this book is to review the fundamentals of fluid lubricating films and to serve as a reference by applying these fundamentals to a variety of examples.

Theory and anaysis are emphasized, and important. Non-liquid lubricants include powders (dry graphite, PTFE, molybdenum disulphide, tungsten disulphide, etc.), PTFE tape used in plumbing, air cushion and others.

Dry lubricants such as graphite, molybdenum disulphide and tungsten disulphide also offer lubrication at temperatures (up to °C) higher than liquid and oil-based lubricants are. Abstract. Liquid lubricants used for spacecraft have advantages over solid lubricants but there are also disadvantages to consider.

The challenge is to ensure that the liquid lubricant does not disappear from the mechanism by evaporation or by: 5. Purchase Lubrication - 1st Edition.

Print Book & E-Book. ISBNBook Edition: 1. Lubricants for space applications Liquid lubricants. Liquid lubricants for space applications need to have low vapor pressure (volatility) in order to withstand the high vacuum on orbit.

Suitable lubricants include perfluoropolyethers, cyclopentanes and polyalphaolefins, mostly in the form of.

Modern understanding of lubrication hence allows the construction of lubricants appropriate to a given application to a certain extent. Under the conditions of full lubrication their physical properties, e.g. viscosity, viscosity-temperature and viscosity –pressure properties dominate over the chemical by: 5.The application of these liquid lubricants in the space environment presents unique challenges.

This article reviews the state of the art of liquid lubrication in space as well as its problems and.The most common examples involve aerospace/space applications, where low temperatures preclude the use of liquid lubricants which simply become too viscous for effective lubrication or may even solidify [6,7].

In fact, most of the technical progress involving solid lubricants was achieved in the second half of the 20th century, motivated by the Cited by: 8.