Browse Publications Technical Papers 2015-01-2101

Impact of Supercooled Liquid Drops onto Cold Solid Substrates 2015-01-2101

Airframe icing caused by supercooled large droplets (SLD) has been identified as a severe hazard in aviation. This study presents an investigation of impact of a supercooled drop onto superhydrophobic and partially wettable substrates. Drop impact, spreading and rebound were observed using a high-speed video system. The maximum spreading diameter of an impacting drop on partially wettable surfaces was measured. The temperature effect on this parameter was only minor for a wide range of the drop and substrate temperatures. However solidification hindered receding when both the drop and substrate temperatures were below 0°C. The minimum receding diameter and the speed of ice accretion on the substrate were measured for various wall and drop temperatures. The two parameters increased almost linearly with the decrease of the wall temperature, but eventually leveled off beyond a certain substrate temperature. The speed of ice accretion on the substrate was significantly higher than the growth rate of free ice dendrites at a certain supercooling. These disparities are attributed to formation of multiple initial nucleation sites and the liquid flow. These experimental results suggest that the superhydrophobic coating cannot prevent in-flight icing, but the total rebound of supercooled drops on protected surfaces, which are heated above the freezing point, would possibly reduce the energy consumption for ice protection.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 17% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Primary Ice Detection Certification Under the New FAA and EASA Regulations


View Details


Developing a Novel Ice Protection System for Wind Turbine Blades Using Vibrations of Both Short and Long Wavelengths


View Details


A Parametric Study on the Thermodynamic Characteristics of DBD Plasma Actuation and Its Potential for Wind Turbine Icing Mitigation


View Details