Calculation of impact characteristics and icing phase transitions of salty droplets

When ships and offshore platforms work in extremely cold and harsh maritime environments, sea spray is the main reason to cause their superstructure to be frozen. In this paper, sea spray is simplified as salty liquid water droplets. Based on the NNW-ICE icing computing platform, the kinetic and thermodynamic models of salty droplets motion were established under the Lagrange framework. Based on the Monte Carlo method and the phase transition model of salty droplets motion, the impact characteristics of salty droplets on the structural surface were simulated. The effects of the moving phase transition on the impact characteristics of salty droplets with different particle sizes were analyzed in this paper, the results show that the impact mass flux of 20 μm and 30 μm salty droplets decreased significantly due to the large mass loss during the movement. Combined with the sea spray freezing phase transition model and two freezing temperature models in ICEMOD, MARICE and SHIPICE, we developed a two-dimensional icing phase transition calculation program for salty droplets based on the NNW-ICE platform. The typical examples are compared and analyzed, and the difference between the calculation results is less than 10%, which verifies that the calculation program has high accuracy and provides strong support for the further development of the numerical calculation of the salty droplets icing.