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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

WATER FILM BOILING HEAT TRANSFER IN THE TUBE IN THE NEAR CRITICAL PRESSURE REGION

V. I. Tolubinsky
Institute of Engineering Thermophysics, Academy of Sciences. Ukrainian SSR, Kiev

A. A. Vasil'yev
Engineering Thermophysics Institute, Ukrainian Academy of Sciences, Kiev

A.A. Mitin
Institute of Engineering Thermophysics of the Ukrainian SSR Academy of Sciences, Kiev, USSR

DOI: 10.1615/IHTC7.1330
pages 427-430

Abstract

Systematic tube temperature regime experiments have been fulfilled under conditions of water forced convection at heat flux densities exceeding the first critical one. The experiments have been carried out in the region of the operating parameters: pressure 19.5 ÷ 21 MPa, mass flux density 1000 ÷ 8000 kg /(m2 s), subcooling O ÷ 140 K, wall temperature up to 800 K. An approximate solution of the film boiling problem in the annular motion of the vapour phase has been considered in the mathematical formulation similar to Hartmann's solution for vapour film condensation in a tube. On the basis of the recomended model a similarity equation has been deduced which generalizes the obtained experimental heat transfer coefficients within the scatter range of the experimental points.

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