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SYSTEMATIC STUDY TO REDUCE THE EFFECTS OF CRACKS IN MULTILAYER INSULATION. 2. EXPERIMENTAL RESULTS.

Author(s) : SHU Q. S., FAST R. W., HART H. L.

Type of article: Article

Summary

A SERIES OF CRACKS WITH DIFFERENT WIDTHS AND SHAPES WAS CUT IN A MULTILAYER INSULATION (MLI) BLANKET. THE INCREMENTAL HEAT LOAD PER UNIT SLOT AREA HAS A MAXIMUM OF ABOUT 135 W/M2. THE HEAT LOAD INCREMENT IS ESSENTIALLY INDEPENDENT OF THE PREPARATION OF THE COLD SURFACE UNDER THE CRACK, IE ITS EMISSIVITY, IF THE SLOT WIDTH IS SUFFICIENTLY SMALL. THE TEMPERATURE DISTRIBUTION AND THE EQUIVALENT THERMAL CONDUCTIVITY NEAR THE CRACKS ARE QUITE DIFFERENT FROM THAT IN A SYSTEM WITHOUT CRACKS. A SYSTEMATIC STUDY OF A CRACK-COVERING < PATCH > METHOD TO REDUCE THE HEAT LOAD TO A 77 K SURFACE THROUGH CRACKS IN A MLI BLANKET WAS CONDUCTED. THE EXPERIMENTAL RESULTS INDICATED THAT THE USE OF A PATCH EVERY FEW LAYERS IS ALMOST AS EFFECTIVE AS USING A PATCH EVERY LAYER. PLACING THE PATCHES IN THE UPPER HALF OF THE BLANKET IS MUCH BETTER THAN IN THE LOWER HALF. A 1,000 ANGSTROMS MATERIAL IS PREFERABLE FOR PATCHES.

Details

  • Original title: SYSTEMATIC STUDY TO REDUCE THE EFFECTS OF CRACKS IN MULTILAYER INSULATION. 2. EXPERIMENTAL RESULTS.
  • Record ID : 1988-0552
  • Languages: English
  • Source: Cryogenics - vol. 27 - n. 6
  • Publication date: 1987

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