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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

HEAT TRANSFER CHARACTERISTICS OF RIFLED TUBES IN THE NEAR CRITICAL PRESSURE REGION

Get access (open in a dialog) DOI: 10.1615/IHTC7.4590
pages 313-318

要約

This paper describes the experimental results on the heat transfer characteristics of rifled tubes required for designing the supercritical sliding pressure operation boiler of vertical water wall tube type and deals with the impairment of heat transfer in the near critical pressure region in detail. Test sections were 17.7mm ID tubes having 4 ribs and their circumferentially heated angles were 360° and 180° respectively.
With the both heating methods, at pressure below 20.6 MPa measured wall temperature was kept near the saturation temperature up to high steam quality region. At pressure above 20.6 MPa, however, an improvement in heat transfer by swirl effect rapidly diminished and CHF quality transferred towards subcooled region. Simultaneously, a peak of wall temperature was observed and the minimum heat transfer coefficient after CHF became the lowest at pressure from 21.3 to 21.6 MPa.