An Experimental Study Of Anti-icing Based On Expansion Energy Of Phase Transition

The phenomenon of attachment and accumulation caused by icing affect people’s production and life,cause economic losses and personal safety accidents.In this paper,proposed an anti-icing method based on expansion energy of phase transition,designed proposal,put forward theory source,research ideas and technical routes.The research is about using the time difference of liquid phase,restricting contact boundary to strengthen the phase expansion force.This paper researched external characteristics of water freezing during phase transformation process through experimental observation of water freezing during the phase transformation and expansion deformation on cold surface and cold environment,prepared anti-icing coating model based on expansion energy of phase transition,carried out performance test,optimization analysis and verification test of anti-icing coating model.The main work and conclusions of this paper are as follows.(1)In this paper,Phase transformation phenomenon of water freezing on cold surface and cold environment was studied,including morphological changes and temperature variation of water droplets,phase transition time characteristics,volume expansion characteristics of water droplets during water freezing.This paper revealed the external characteristics of water icing process by experimental observation and measurement.The study indicated that the water droplets have experienced a clear state,super-cooled state,the formation of the ice interface,the moving up of ice interface,and the bulge on the top during water freezing period.The water droplets have experienced rapid cooling,super-cooled,suddenly increasing and rapid declining of temperature.Finally,the temperature gradually stabilized.Droplet size affects the icing phase transition time.The larger the droplet size,the longer the time.The volume expansion of the freezing solution is obvious,and the volume expansion mainly occurs in the phase transition process.(2)this paper prepared anti-icing coating model based on expansion energy of phase transition,verified feasibility of the method,studied the effect of the coating model on the icing tangential adhesion strength.The tangential force was used as the index to study the effect of solution concentration on the tangential force.The surface of the model and the ice interface were observed.The results show that the icing tangential adhesion strength of model is obviously lower than that of the untreated prototype.The lower the solution concentration is,the lower the icing tangential adhesion strength.Ice interface of coating model filled with low freezing solution presented a rugged structure and the largest depression was at the center.(3)The optimal anti-icing model is studied through the experiment optimization and testing methods taking the icing tangential force as the test index.This paper carried out variance analysis,verified the optimal coating model,and simulated the actual natural environment to carry out icing test.The results show that the influence of reducing the tangential force of icing is the concentration of the low freezing solution>the depth of the pit> the diameter of the pits.The optimal combination is the anti-icing coating model with the concentration of ethanol solution 6%,the diameter of 22 mm and the depth of 4.7mm.The icing tangential adhesion strength of 0.08 g / m L impurity content can be reduced by 56.36% after applying the optimal anti-icing coating model.The less the impurity content is,the better the effect to reduce the icing tangential adhesion strength.