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Title: OPTIMIZATION OF LAYER DENSITIES FOR MULTILAYERED INSULATION SYSTEMS

Abstract

Numerous tests of various multilayer insulation systems have indicated that there are optimal densities for these systems. However, the only method of calculating this optimal density was by a complex physics based algorithm developed by McIntosh. In the 1970's much data were collected on the performance of these insulation systems with many different variables analyzed. All formulas generated included number of layers and layer density as geometric variables in solving for the heat flux, none of them was in a differentiable form for a single geometric variable. It was recently discovered that by converting the equations from heat flux to thermal conductivity using Fourier's Law, the equations became functions of layer density, temperatures, and material properties only. The thickness and number of layers of the blanket were merged into a layer density. These equations were then differentiated with respect to layer density. By setting the first derivative equal to zero, and solving for the layer density, the critical layer density was determined. This method was checked and validated using test data from the Multipurpose Hydrogen Testbed which was designed using Mcintosh's algorithm.

Authors:
 [1]
  1. NASA Kennedy Space Center, KT-E Kennedy Space Center, FL 32899 (United States)
Publication Date:
OSTI Identifier:
21371807
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1218; Journal Issue: 1; Conference: International cryogenic materials conference (ICMC) on advances in cryogenic engineering materials, Tucson, AZ (United States), 28 Jun - 2 Jul 2009; Other Information: DOI: 10.1063/1.3422434; (c) 2010 American Institute of Physics; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ALGORITHMS; DENSITY; HEAT FLUX; HEAT RESISTANT MATERIALS; HEAT TRANSFER; HYDROGEN; LAYERS; OPTIMIZATION; PERFORMANCE; SHIELDING; SHIELDING MATERIALS; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY; THERMAL INSULATION; THICKNESS; DIMENSIONS; ELEMENTS; ENERGY TRANSFER; MATERIALS; MATHEMATICAL LOGIC; NONMETALS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES

Citation Formats

Johnson, W L. OPTIMIZATION OF LAYER DENSITIES FOR MULTILAYERED INSULATION SYSTEMS. United States: N. p., 2010. Web. doi:10.1063/1.3422434.
Johnson, W L. OPTIMIZATION OF LAYER DENSITIES FOR MULTILAYERED INSULATION SYSTEMS. United States. https://doi.org/10.1063/1.3422434
Johnson, W L. 2010. "OPTIMIZATION OF LAYER DENSITIES FOR MULTILAYERED INSULATION SYSTEMS". United States. https://doi.org/10.1063/1.3422434.
@article{osti_21371807,
title = {OPTIMIZATION OF LAYER DENSITIES FOR MULTILAYERED INSULATION SYSTEMS},
author = {Johnson, W L},
abstractNote = {Numerous tests of various multilayer insulation systems have indicated that there are optimal densities for these systems. However, the only method of calculating this optimal density was by a complex physics based algorithm developed by McIntosh. In the 1970's much data were collected on the performance of these insulation systems with many different variables analyzed. All formulas generated included number of layers and layer density as geometric variables in solving for the heat flux, none of them was in a differentiable form for a single geometric variable. It was recently discovered that by converting the equations from heat flux to thermal conductivity using Fourier's Law, the equations became functions of layer density, temperatures, and material properties only. The thickness and number of layers of the blanket were merged into a layer density. These equations were then differentiated with respect to layer density. By setting the first derivative equal to zero, and solving for the layer density, the critical layer density was determined. This method was checked and validated using test data from the Multipurpose Hydrogen Testbed which was designed using Mcintosh's algorithm.},
doi = {10.1063/1.3422434},
url = {https://www.osti.gov/biblio/21371807}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1218,
place = {United States},
year = {Fri Apr 09 00:00:00 EDT 2010},
month = {Fri Apr 09 00:00:00 EDT 2010}
}