Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

SUBCOOLED FORCED CONVECTION BOILING HEAT TRANSFER AT SUBATMOSPHERIC PRESSURE

Get access (open in a dialog) DOI: 10.1615/IHTC6.590
pages 287-292

Abstrakt

An experimental study of boiling heat transfer to subcooled water in vertical upward flow through a smooth concentric annulus at subatmospheric pressure is presented. Experiments were carried out in a test section of 12 mm inner and 22 mm outer diameter in which heat was transferred from the central Inconel 600 tube to fully desalinated subcooled water in turbulent annular flow. A theoretical determination of the Initial Point of Boiling (IPB) based on the heterogeneous nucleation theory is derived. The influence of the content of gas in the water on the transition region is investigated for 0.6 bar and in comparison for 2 bar. The IPB theory is compared with our experimental results for pressures from 0.4 to 4 bar and velocities from 0.5 to 4 m/s. Furthermore the influence of pressure (0.25, 0.4 and 0.6 bar) on fully developed subcooled boiling is pointed out. These measurements are in good agreement with Stephan's equation. Some burnout experiments are compared with the equations of Zuber and Mirshak. Finally the reproducibility of measurements is recorded for pressures from 0.25 to 1 bar.