Abstract
Thermal conductivity measurements of multilayer insulations have been made by various experimenters using guarded flat-plate calorimetric techniques[1]. The validity of using flat-plate calorimeter values for design and selection of multilayer insulations to be used on typical cryogenic tankage is questionable. The effective insulation conductivity observed for most tank wraps is greater than the measured flat-plate value due to effects of corner compression, degradation at penetrations, and application technique. This paper discusses and compares a number of tank calorimeter results with values based on flat-plate calorimeter data. Conductivity results are also presented at various pressure levels along with equations for predicting these pressure effects.
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Abbreviations
- A :
-
cross-sectional area
- k :
-
effective thermal conductivity
- k gc :
-
effective thermal conductivity due to gas conduction
- M :
-
molecular weight
- N :
-
layer density
- p :
-
pressure
- P ins :
-
insulation pressure
- PCH :
-
chamber pressure
- Q :
-
heat rate
- R :
-
universal gas constant
- T H :
-
hot boundary temperature
- T c :
-
cold boundary temperature
- T M :
-
average temperature
- T ins :
-
insulation temperature
- T CH :
-
chamber temperature
- α:
-
accommodation coefficient
- γ:
-
specific heat ratio
- δ:
-
insulation thickness
- ε:
-
emissivity at room temperature
References
C. W. Keller, G. R. Cunnington, and A. P. Glassford, “Final Report—Thermal Performance of Multilayer Insulations,” NASA CR-134477 (April 1974).
T. C. Nast, “Final Engineering Report, Solid Cryogen Cooler for NIMBUS F,” Lockheed Missiles and Space Company, Inc., LMSC-D358720 (March 1974).
A. P. M. Glassford, J. Spacecraft and Rockets 7(12): 1464 (1970).
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© 1977 Springer Science+Business Media New York
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Bell, G.A., Nast, T.C., Wedel, R.K. (1977). Thermal Performance of Multilayer Insulation Applied to Small Cryogenic Tankage. In: Timmerhaus, K.D., Reed, R.P., Clark, A.F. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 22. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9850-9_29
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DOI: https://doi.org/10.1007/978-1-4613-9850-9_29
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