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TRANSIENT HEAT TRANSFER TO A FORCED FLOW OF SUPERCRITICAL HELIUM AT 4.2 K.

Author(s) : BLOEM W. B.

Type of article: Article

Summary

THE TRANSIENT HEAT TRANSFER COEFFICIENT OF SUPERCRITICAL HELIUM FLOWING THROUGH A RECTANGULAR COPPER TUBE HAS BEEN MEASURED. THE INLET BULK TEMPERATURE WAS 4.2 K, PRESSURES FROM 300 TO 1,000 KILOPASCALS AND REYNOLDS NUMBERS BETWEEN 15,000 AND 200,000. THE TUBE WAS HEATED ON FOUR SIDES WITH HEAT FLUXES UP TO 9,800 W/M2. DURING THE FIRST TENS OF MILLISECONDS THE HEAT TRANSFER IS DETERMINED BY THE HEAT CONDUCTION IN THE BOUNDARY LAYER OF THE SUPERCRITICAL HELIUM FLOW. IT WAS REMARKABLE THAT THE TEMPERATURE INCREASE DURING A HEAT PULSE WAS ALMOST THE SAME AT DIFFERENT FLOW PRESSURES.

Details

  • Original title: TRANSIENT HEAT TRANSFER TO A FORCED FLOW OF SUPERCRITICAL HELIUM AT 4.2 K.
  • Record ID : 1987-0418
  • Languages: English
  • Source: Cryogenics - vol. 26 - n. 5
  • Publication date: 1986

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