EFFECT OF SUBCOOLING ON CRITICAL HEAT-FLUX DURING POOL BOILING ON A HORIZONTAL HEATED WIRE

Critical heat flux(CHF) is measured during pool boiling of water and R 113 on a heated horizontal wire submerged in a subcooled liquid. Exper iments are conducted over a pressure range from 0.1 to 3.0 MPa and sub cooling up to 220 K. CHF data reveal that the CHF increases in a linea r fashion with an increase in subcooling, and that the increment of th e CHF with increasing subcooling becomes larger with increasing pressu re. The characteristics of the CHF obtained differ from those of exist ing correlations at high pressures, although it is a similar tendency to them in that the CHF is proportional to the subcooling. A new corre lation is derived by taking into account the effect-of both the densit y ratio, rho(L)/rho(V), and the Peclet number, Pe, and it succeeds in predicting the CHF data up to higher pressure and higher subcooling ra nges, more effectively than previous studies using existing applicable ranges.