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Objectstaat
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Title
Thermal Performance of Cryogenic Multilayer Insulation at Variou
ISBN
9781288909759
Publication Year
2013
Type
Textbook
Format
Paperback
Language
English
Publication Name
Thermal Performance of Cryogenic Multilayer Insulation at Various Layer Spacings
Item Height
246mm
Author
Wesley Louis Johnson
Publisher
Biblioscholar
Item Width
189mm
Subject
Education
Item Weight
191g
Number of Pages
98 Pages

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Product Information

Multilayer insulation (MLI) has been shown to be the best performing cryogenic insulation system at high vacuum (less that 10 (exp 3) torr), and is widely used on spaceflight vehicles. Over the past 50 years, many investigations into MLI have yielded a general understanding of the many variables that are associated with MLI. MLI has been shown to be a function of variables such as warm boundary temperature, the number of reflector layers, and the spacer material in between reflectors, the interstitial gas pressure and the interstitial gas. Since the conduction between reflectors increases with the thickness of the spacer material, yet the radiation heat transfer is inversely proportional to the number of layers, it stands to reason that the thermal performance of MLI is a function of the number of layers per thickness, or layer density. Empirical equations that were derived based on some of the early tests showed that the conduction term was proportional to the layer density to a power. This power depended on the material combination and was determined by empirical test data. Many authors have graphically shown such optimal layer density, but none have provided any data at such low densities, or any method of determining this density. Keller, Cunnington, and Glassford showed MLI thermal performance as a function of layer density of high layer densities, but they didn't show a minimal layer density or any data below the supposed optimal layer density. However, it was recently discovered that by manipulating the derived empirical equations and taking a derivative with respect to layer density yields a solution for on optimal layer density. Various manufacturers have begun manufacturing MLI at densities below the optimal density. They began this based on the theory that increasing the distance between layers lowered the conductive heat transfer and they had no limitations on volume. By modifying the circumference of these blankets, the layer density can easily be vari

Product Identifiers

Publisher
Biblioscholar
ISBN-13
9781288909759
eBay Product ID (ePID)
149006018

Product Key Features

Author
Wesley Louis Johnson
Publication Name
Thermal Performance of Cryogenic Multilayer Insulation at Various Layer Spacings
Format
Paperback
Language
English
Subject
Education
Publication Year
2013
Type
Textbook
Number of Pages
98 Pages

Dimensions

Item Height
246mm
Item Width
189mm
Item Weight
191g

Additional Product Features

Title_Author
Wesley Louis Johnson

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  • GB 724498118
Handelsregistratienummer:
  • 03800600
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