Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Résumé

This paper proposes an analytical model of the adhesion shear stress of non-confined accreted ice on different substrates. The model is based on the existence of an amorphous liquid-like layer (LLL) at the substrate/accreted-ice interface adhering by capillary forces. This analytical model includes both substrate properties and icing parameters but is limited to rigid substrates. For the preliminary validation of this model, 54 centrifuge adhesion tests (CAT) were performed to measure ice adhesion of accreted ice on three different substrates at different temperatures. The validation strategy uses the proposed model to calculate the nucleation time of water droplets upon impact with the substrate to fit with experimental results. These nucleation times were calculated and found to be in accordance with theory and available literature data, showing that this new approach involving the LLL seems promising.