Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
EXPERIMENTAL INVESTIGATION OF THE ANTI-ICING PROPERTIES OF HYDROPHOBIC SURFACES
Submission Author:
Lígia Froening , RJ , Brazil
Co-Authors:
Higuel Norões, Pedro Petindá, Juliana Loureiro
Presenter: Lígia Froening
doi://10.26678/ABCM.ENCIT2016.CIT2016-0433
Abstract
The ice formation that can happen at any aircraft component, both during the flight and on the ground, is a critical factor for the aeronautic sector due to the risks offered to security and flight performance downgrade. Although airplanes are equipped with de-icing systems, the development of new anti-icing technologies can render more efficient solutions for this industrial sector. In particular, a special type of hydrophobic surface may reduce flight expenses by reducing surface drag and by decreasing the power required for the de-icing heating system. In this context, the objective of this work is to quantify the behavior of self-similar hydrophobic surfaces subjected to different water droplets size distributions, under a range of Reynolds numbers and flow temperature. For this purpose, the hydrophobic surfaces were characterized in the Climatic wind-tunnel of NIDF/COPPE/UFRJ, which is capable of simulating extreme atmospheric conditions such as low temperatures, high velocities and different humidity conditions. Water droplet size distribution, flow velocity and fluid temperature were systematically varied in order to investigate the effects of droplet impact against the surface. Mean flow velocity and turbulence statistics where measured through PIV (Particle Image Velocimetry), whereas the droplet diameter distribution was characterized with the aid of a Shadow Sizer System. Furthermore, high-speed camera images were used to quantify the ice accretion evolution on the hydrophobic surface. The experimental results were used to identify the climatic conditions where the surfaces are shown to be more promising.
Keywords
Wind Tunnel, icing, hydrophobic surface, Droplet size distributions, Turbulence, Wind Tunnel, icing, hydrophobic surface, Droplet size distributions, Turbulence, Wind Tunnel, icing, hydrophobic surface, Droplet size distributions, Turbulence
