Transactions of Nanjing University of Aeronautics & Astronautics
Numerical Study on Dynamic Behavior of Non-Newtonian De-icing Liquid Film Impacted by Water Droplets
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Abstract:
In freezing rainy weather， physical processes， such as sputtering， spreading， and miscibility， will occur after the supercooled large water droplets hit the liquid film of the de-icing liquid， the temperature and concentration of the liquid film of the de-icing liquid will decrease， the freezing point of the liquid film will rise and the viscosity will decrease， causing the liquid film to slide and detach and greatly shortening the anti-icing holding time. Based on the volume of fluid （VOF） method and combined with the component transport equation， a dynamic behavior model of multi-phase， multi-component， multi-system， multi-field coupled water droplet hitting non-Newtonian de-icing liquid film is constructed. Based on this numerical model， the kinetic behavior of water droplet hitting the unsteady state process and the non-Newtonian rheological characteristics， such as dilution and viscosity reduction of liquid film， are studied. The results show that the higher the initial concentration of the liquid film， the greater the degree of inhibition of the growth of the water droplet crown， the smaller the spreading diameter of the water droplet after impact， the more obvious the water transport migration phenomenon in the collision area of the water droplet and the de-icing liquid film， and the more obvious the viscosity decrease of the de-icing liquid film under the coupling effect of shear dilution and concentration reduction. The larger the initial diameter of the water droplet， the larger the range of the water droplet on the liquid film， and the greater the decrease in the viscosity of the liquid film. The greater the falling impact speed of the water droplet， the faster the migration rate of the components of the water droplet in the liquid film， and the more obvious the viscosity loss of the liquid film.
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This work was supported in part by the National Natural Science Foundation of China （No. 52076212）， and the Tianjin Research Innovation Project for Postgraduate Students （No.2022SKYZ359）. The authors realize that the time and space available for a review of such an ambitious subject are limited and， thus， regretfully， we are unable to cover many important contributions. The authors would like to acknowledge the following people for their assistance： NIU Shuxin， LI Hongwei， WANG Chengxuan， all with the Laboratory of Aircraft ice and frost suppression， Civil Aviation University of China.
Clc Number:
O359
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