ISSN Online: 2377-424X
ISBN Print: 0-89116-559-2
International Heat Transfer Conference 8
EFFECT OF SUBCOOLING ON FILM BOILING HEAT TRANSFER FROM HORIZONTAL CYLINDER IN A POOL OF WATER
Sinopsis
Effect of subcooling on film boiling heat transfer from horizontal cylinder in a pool of water was studied. Experiments were performed for the heater surface superheat of around 120 to 800 K, water subcooling from 0 to 40 K, system pressure from 100 kPa to 2 MPa and for the diameter of the cylinder from 0.7 to 5 mm. The experimental data for the non-dimensional cylinder diameter around 1.3 almost accorded with the values derived from a theoretical film boiling model according to the two-phase laminar boundary layer theory. However, with increasing or decreasing the non-dimensional diameter from 1.3, the experimental values gradually became larger than the theoretical values. A new correlation for the saturated and subcooled film boiling heat transfer from horizontal cylinder with the effect of radiation from the cylinder was developed by modifying an approximate solution of the theoretical film boiling model in the light of this experimental data. Saturated and subcooled film boiling heat transfer coefficients calculated from the correlation agree well with the experimental results.