TRANSIENT POOL BOILING HEAT TRANSFER TO HELIUM 4 FROM FLAT SURFACES - 2ND REPORT.

Takehiro Ito, Yasuyuki Takata, Hiromi Kubota, Masahiro Uesono

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Experiments on transient pool boiling heat transfer to liquid helium 4 for the step type heat flux,q,application have been carried out at the atmospheric pressure. Thin carbon films worked as heater and as thermometer at the same time. Two types of test piece were made. Substrate of the first type had carbon film on one side of it and that of the second type was sandwiched between two layers of carbon film to reduce the heat loss. The temperature excursions were measured in the heat flux range from 1. 9 to 100 left bracket kW/m**2 right bracket . The results have indicated that the Kapitza conductance h k,ref at the reference temperature Tk,ref ( equals 4. 2 left bracket K right bracket in this report) is around 30 left bracket kW/m**2 multiplied by (times) K right bracket and the time at the onset of transition to film boiling tf obeys a q** minus **2 relationship.

Original languageEnglish
Title of host publicationProceedings of the International Cryogenic Engineering Conference
EditorsGustav Klipping, Ingrid Klipping
PublisherEngl
Pages638-643
Number of pages6
ISBN (Print)0408012587
Publication statusPublished - 1986

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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