Entropy and exergy analysis of the steam jet condensation in crossflow of subcooled water

Abstract

The direct contact condensation of steam jet in the liquid is an irreversible process with inevitable energy loss. In this paper, interaction between the subcooled water and gas-liquid two-phase boundary, and influence of thermal hydraulic parameters on the change of entropy and exergy are studied. Because of the crossflow of subcooled water, two-phase heat transfer occurs mainly in four regions of the plume cross-section. With increasing temperature, the growth rate of subcooled water entropy flow increases significantly, and the change in the dissipation ratio and damping ratio of kinetic energy is smoother. With the increase of steam mass flux, the entropy flow of the subcooled water reaches a peak at the end of the plume and the peak continuously increases, and the dissipation ratio of kinetic energy and the subcooled water entropy flow fluctuate more violently. Most energy dissipation occurs between the location of maximum jet velocity and the tail of steam jet.