ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Freezing characteristics of supercooled water droplet in consideration of non-equilibrium effect
Received date: 2016-08-24
Revised date: 2016-11-23
Online published: 2016-12-05
Supported by
National Natural Science Foundation of China (51308531, 11672322); National Basic Research Program of China (2015CB755800)
Non-equilibrium effect is an important phenomenon in freezing of supercooled water droplet in aircraft icing process. Based on the enthalpy-porosity model, a numerical prediction method for freezing of supercooled water droplet is developed. The experimental system for droplet freezing is built up and several experiments are performed to validate the numerical method proposed. The results indicate that the developed model is valid and can be used to predict the freezing characteristics of supercooled water droplet. Based on the improved freezing model, the influence of the degree of supercooled and cooling conditions on the characteristics of supercooled droplet are analyzed. When the degree of supercooled is decreased to zero, the developed model degenerates to the traditional model. The greater or smaller the degree of supercooled or smaller the droplets is, the relatively higher freezing rate is. In consideration of the effect of non-equilibrium conditions, the freezing and moving rate of interface is higher than the traditional model. Related research can provide important reference for improving icing thermodynamic model and refining the prediction method for icing accretion.
XIAO Guangming , DU Yanxia , WANG Qiao , GUO Long , WANG Mao . Freezing characteristics of supercooled water droplet in consideration of non-equilibrium effect[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(2) : 520703 -520709 . DOI: 10.7527/S1000-6893.2016.0309
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