Research on flow and heat transfer characteristic of over-expanded supersonic steam jet in water

An experiment, with the steam pressure 0.4 and 0.5 MPa, and the water temperature 20~50°C, was designed to investigate the steam plume shape, condensation heat transfer characteristic and temperature fields of an over-expanded supersonic steam jet in subcooled water. An analysis model was given to describe the steam plume shape, contraction ratio and dimensionless penetration length. Moreover, the average condensation heat transfer coefficient was obtained in the range of 0.71~1.16 MW/(m² · °C) by the correlation. According to the heat convection model and a simplified area expression of the steam plume, the average condensation heat transfer coefficient was obtained in the range of 0.71~1.03 MW/(m² · °C). The results indicated that the similar average heat transfer coefficients could be obtained by the two different methods.