Abstract
Supercooled droplets freezing on solid surfaces are ubiquitous in nature. This letter investigates the influences of droplet viscosity on freezing velocity and frosting formation. Several experiments were conducted for three kinds of sessile droplets (water, silicone oil and oil) on two types of substrates (copper and iron) with different surface roughness at various temperatures. The results show that the water droplets exhibit obvious phase transition lines and their freezing speeds increase when the temperature of substrates decreases. It is found that the freezing speed is independent of the thermal conductivities of the substrates. Notably, the water droplets develop prominent bulges after freezing and subsequently nucleate to frost. In contrast, the high viscosity oil and silicone oil do not manifest an obvious phase transition line. Besides, no bulges are observed in these two kinds of droplets, suggesting that these frosting forms are of different mechanisms compared with water droplets.
Highlights
Revealing icing mechanisms especially in particular environments is crucial in the transmission circuit system such as the aircraft structures and wind power generation industries.[1,2,3] For example, icing on airfoil of airplanes can cause the deterioration of aerodynamic configuration and lead to stall occurring
Shiren La,[1,2] Zhiting Huang,[1,2] Cong Liu,[1,2] and Xingyi Zhang1,2,a 1Department of Mechanics and Engineering Sciences, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, PR China 2Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, Lanzhou University, Lanzhou, Gansu 730000, PR China (Received 5 March 2018; accepted 16 May 2018; published online 23 May 2018)
Icing on airfoil of airplanes can cause the deterioration of aerodynamic configuration and lead to stall occurring
Summary
Revealing icing mechanisms especially in particular environments is crucial in the transmission circuit system such as the aircraft structures and wind power generation industries.[1,2,3] For example, icing on airfoil of airplanes can cause the deterioration of aerodynamic configuration and lead to stall occurring. Shiren La,[1,2] Zhiting Huang,[1,2] Cong Liu,[1,2] and Xingyi Zhang1,2,a 1Department of Mechanics and Engineering Sciences, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, PR China 2Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, Lanzhou University, Lanzhou, Gansu 730000, PR China (Received 5 March 2018; accepted 16 May 2018; published online 23 May 2018)
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