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HEAT TRANSFER CHARACTERISTICS OF EXFOLIATED VERMICULITE FOR CRYOGENIC INSULATION.

Author(s) : MAITI C. R.

Type of article: Article

Summary

THE EFFECTIVE THERMAL CONDUCTIVITY OF EXFOLIATED VERMICULITE POWDER HAS BEEN MEASURED FOR ABSOLUTE PRESSURES RANGING FROM 10-6 TORR TO ONE ATMOSPHERE (1.33 X 0.00001 TO 1.01 X 0.1 PA) AND FOR BOUNDARY SURFACE TEMPERATURES AT 77 K AND AT ABOUT 300 K. THE EXPERIMENTAL VALUES WERE COMPARED WITH THE THEORETICAL VALUE OF THE EFFECTIVE THERMAL CONDUCTIVITY EVALUATED AS THE SUM OF THE TWO COMPONENTS: SOLID CONDUCTION AND RADIATION ; GAS PHASE CONDUCTION ON THE ASSUMPTION THAT THE POWDER IS MADE OF THIN CIRCULAR DISCS ON LINES. THE RESULTS INDICATE THAT THERE IS AN OPTIMUM PARTICLE SIZE OF PLATE TYPE EXFOLIATED VERMICULITE.

Details

  • Original title: HEAT TRANSFER CHARACTERISTICS OF EXFOLIATED VERMICULITE FOR CRYOGENIC INSULATION.
  • Record ID : 1981-0048
  • Languages: English
  • Source: Cryogenics - vol. 20 - n. 6
  • Publication date: 1980/06

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