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THE EFFECT OF TUBE DIAMETER AND DUCT CROSS-SECTION SHAPE ON HEAT TRANSFER AT FLOW BOILING OF CRYOGENIC FLUIDS. 1. FORCED CONVECTIVE BOILING REGION. 2. NUCLEATE BOILING REGION.

Author(s) : BAUMANN P., STEINER D.

Type of article: Article

Summary

HEAT TRANSFER IN THE FORCED CONVECTIVE BOILING REGION FOR NONCIRCULAR CROSS-SECTIONS CAN BE PREDICTED USING THE HYDRAULIC DIAMETER. THIS CONCEPT GIVES REASONABLE ACCURACY AS LONG AS THE PERIMETER OF THE DUCT IS COMPLETELY WETTED, EG FOR VERTICAL DUCTS. FURTHER INFORMATION IS NEEDED IN HORIZONTAL DUCTS ABOUT THE SECONDARY FLOW AND THE PARTIAL WETTING IN CONNECTION WITH THE FLOW PATTERN. THEEXPERIMENTAL RESULTS FOR NUCLEATE BOILING OF CRYOGENIC AND OTHER FLUIDS IN VERTICAL TUBES SHOW A SIGNIFICANT INFLUENCE OF THE TUBE DIAMETER ON THE HEAT TRANSFER COEFFICIENT. IN ADDITION, THE WETTING BEHAVIOUR OF THE DUCT MUST BE KNOWN FOR HORIZONTAL TUBES WITH CIRCULAR AND NON-CIRCULAR CROSS-SECTION. THIS IS A COMPLICATED FUNCTION OF THE CROSS-SECTION SHAPE, FLOW PARAMETERS AND THE CONDITIONS OF CONSTANT HEAT FLUX OR CONSTANT WALL TEMPERATURE.

Details

  • Original title: THE EFFECT OF TUBE DIAMETER AND DUCT CROSS-SECTION SHAPE ON HEAT TRANSFER AT FLOW BOILING OF CRYOGENIC FLUIDS. 1. FORCED CONVECTIVE BOILING REGION. 2. NUCLEATE BOILING REGION.
  • Record ID : 1991-2488
  • Languages: English
  • Source: Fiz. nizk. Temp. - vol. 16 - n. 5
  • Publication date: 1990
  • Document available for consultation in the library of the IIR headquarters only.

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