Session: K12-01: AEROSPACE HEAT TRANSFER I

Paper Number: 131333

131333 - Numerical Analysis of Surface Coatings Performances for In-Flight Icing Device Performance Enhancement 

Abstract: 

 

A number of high-performance, nanostructured, super-hydrophobic, and ice-phobic coatings have been proposed in recent years in order to enhance the performances of thermal anti and de-icing devices for in-flight icing protection purposes. Since the most successful simulation tools for ice accretion modeling are based on the Messinger approach, the numerical prediction of such performances is not a trivial task. Here a Lagrangian phenomenological model, previously developed and validated against literature experimental cases, is adopted. A population of individual droplets is followed, via a Lagrangian approach, from the first impact on the surface, through possible rebounds and secondary impacts, and then through all of the possible evolution as standing droplets, growth via coalescence, transition to moving droplets, evolution into rivulets, transition to full film flow, taking into account freezing beads creation and evaporation. Each droplet, bead, or rivulet is defined as an individual entity, whose evolution is governed by phenomenological rules derived either by experimental correlations or high fidelity heat and fluid flow fully 3D computation of the single droplet or of the contact line evolution of a rivulet or film. The model is used to investigate the anti-icing performances ensured by different coating, characterized by their wetting properties and ice-adhesion, under a wide range of operational conditions in terms of shear stress, supercooling, droplet diameters, and de-icing heat flux. The aim is to identify a range of coating properties that can effectively enhance the performances of thermal de-icing devices, as well as identify the limiting condition that should be verified if a fully passive device were desired.

Presenting Author: Giulio Croce Uiniversity of Udine

Presenting Author Biography: Full professor of Thermodynamics and Heat transfer at University of Udine, his main research interest is focused on computational thermo-fluid dynamics, where he worked in algorithm development as well as engineering applications. He developed cooperation with academic and industrial partners, as illustrated by paper co-authorship with colleagues from Italian and foreign universities (such as McGill and Concordia in Montreal, Florida University, Russian Academy of Sciences) and companies (among other Ansaldo, Pratt&Whitney, Bombardier Aerospace, Fincantieri).
He worked on enhancing heat transfer techniques for single phase heat exchanger and de-humidifiers, combustion and heat transfer in gas turbine components, conjugate heat transfer and droplet-surface interaction for in-flight icing problems, CFD simulation for the refrigeration industry.
In particular, he developed computational and phenomenological models for the prediction of thin films and droplet evolution along surfaces in presence of heat transfer. The outcome of this research activity included both academic papers and practical application, developed through industry-funded activities, for in-flight icing problems, fogging and defogging phenomena, condensing and dehumidification simulations.
He also focused on micro scale flow and heat transfer, participating in several national and European funded projects. His contributions are focused on fluid-surface interaction (in particular roughness and surface texture effects) and heat transfer performances. He considered both incompressible flow and compressible one. In the gas flow simulation area he worked on both continuum (Navier Stokes) solvers and hybrid Navier-Stokes – kinetic ones.

Authors:

Giulio Croce Uiniversity of Udine
Nicola Suzzi University of Udine