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EFFECT OF CHANNEL RESTRICTIONS ON THE AXIAL HEAT TRANSPORT IN SUBCOOLED SUPERFLUID HELIUM.

Author(s) : KHALIL A.

Type of article: Article

Summary

DIFFERENT SIZE ORIFICES ARE USED TO SIMULATE PARTIAL PLUGGING OF SUPERCONDUCTING MAGNETS COOLING CHANNELS BY FROZEN OXYGEN, NITROGEN, HYDROGEN, NEON OR MOISTURE DURING THE COOL DOWN PROCESS. TEMPERATURE DROP ACROSS THE RESTRICTION IS MEASURED BY TWO CALIBRATED CARBON RESISTORS. MEASUREMENTS ARE CARRIED OUT AT BOTH TEMPERATURES RANGING FROM 1.8 TO 2.2 K. AS THE ORIFICE/CHANNEL AREA RATIO DECREASES, DATA SHOW A CONSIDERABLE DECREASE IN THE AXIAL HEAT TRANSPORTED BY INTERNAL CONVECTION PROCESS RESULTING IN LOWER CRITICAL HEAT FLUX AT THE PHASE TRANSITION FROM HELIUM II TO HELIUM I BY THE DESTRUCTION OF SUPERFLUIDITY AND INITIATION OF BOILING. A LINEAR CORRELATION BETWEEN CRITICAL CHANNEL HEAT FLUX AND ORIFICE/CHANNEL AREA RATIO GIVES A GOOD FIT TO THE EXPERIMENTAL DATA.

Details

  • Original title: EFFECT OF CHANNEL RESTRICTIONS ON THE AXIAL HEAT TRANSPORT IN SUBCOOLED SUPERFLUID HELIUM.
  • Record ID : 1983-2088
  • Languages: English
  • Source: Cryogenics - vol. 23 - n. 2
  • Publication date: 1983

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