SUMMARYExperimental study on direct contact condensation (DCC) of a stable steam discharging into a quenching tank with sub-cooled water has been performed for "ve di!erent sizes of horizontal nozzles over a wide range of steam mass #ux and pool temperature conditions. Two di!erent steam jet shapes (conical and ellipsoidal) were typically observed, depending on the steam mass #ux and the pool temperature. The steam jet expansion ratios, the dimensionless steam jet lengths, and the average heat transfer coe$cients were determined and the e!ects of steam mass #ux, pool temperature, and nozzle diameter on these parameters were discussed. Empirical correlations for the dimensionless steam jet length and the average heat transfer coe$cient as a function of steam mass #ux and condensation driving potential were established. The axial and radial temperature distributions in the steam jet and in the surrounding pool water were measured and the e!ects of steam mass #ux, pool temperature, and nozzle diameter on these parameters were also discussed.

No abstract