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EVAPORATION OF MACROLAYER IN NUCLEATE BOILING NEAR BURNOUT.

Author(s) : CHYU M. C.

Type of article: Article

Summary

THE MECHANISM OF NUCLEATE BOILING HEAT TRANSFER NEAR BURN-OUT HAS BEEN INVESTIGATED BY STUDYING THE EVAPORATION OF THE LIQUID MACROLAYER UNDERNEATH THE VAPOUR MASS. IL IS PROVED THAT HEAT CONDUCTIONACROSS THE MACROLAYER AND EVAPORATION AT THE FREE SURFACE IS NOT A MODE EFFICIENT ENOUGH TO ACCOUNT FOR THE MAJOR PORTION OF HEAT TRANSFER. THE ALTERNATIVE MODEL PROPOSED IS A MACROLAYER PRIMARILY CONSUMED THROUGH EVAPORATION OF MUCH THINNER MICROLAYERS AT THE BOTTOM OF VAPOUR STEMS PENETRATING THE MACROLAYER. IT SHOWS THAT THE MACROLAYER DOES NOT TOTALLY DRY OUT IN A VAPOUR-MASS CYCLE BEFORE BOILING CRISIS. OTHER MECHANISMS ARE ALSO DISCUSSED.

Details

  • Original title: EVAPORATION OF MACROLAYER IN NUCLEATE BOILING NEAR BURNOUT.
  • Record ID : 1988-0519
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 30 - n. 7
  • Publication date: 1987

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