Optimization of ground icing protection for aircraft: Snow endurance tests, rheological analysis and thermography of anti-icing fluids

Poster presentation at the colloquium seminar, arranged by Université du Québec à Chicoutimi (UQAC), Chicoutimi, 11.10.2023

Computing offloading and load balancing within UAV clusters

International audienc

Optimization of ground icing protection for aircraft : snow endurance tests, rheological analysis and thermography of anti-icing fluids

The fluids studied in this section are EG106 SAE Type IV and Polar Guard Advance Type IV. EG 106 is an ethylene glycol-based product, and PG is a propylene glycol-based product. For each test, 16.2 g of the product was placed on a small aluminum plate with a thickness of about 1.6 mm. The tests were conducted at-5 C, and the cold chamber ventilation was set at 60. During this test, several snow deposits of the same quantity were applied to each product every 2 minute

Corrigendum to “Effect of surfactant lengths on gas–liquid oxygen mass transfer from a single rising bubble” [Chem. Eng. Sci. 247 (2022) 117102]

International audienc

Effect of surfactant lengths on gas-liquid oxygen mass transfer from a single rising bubble

International audienceThis work is an experimental investigation of the effect of the nature of surfactants on oxygen mass transfer. The study focuses on three cationic surfactants with different hydrophobic chain lengths, and four nonionic surfactants with different hydrophilic chain lengths. Equilibrium adsorption isotherms are calculated for each surfactant from experimental values of surface tension in static conditions. Surfactant solutions at concentrations between 2.5×10-8 and 5×10-3 mol/L were prepared and oxygen transfer from millimetric air bubbles (between 0.82 and 1.08 mm) was measured by Planar Laser Induced Fluorescence with Inhibition (PLIF-I). When the bulk concentration of surfactant was increased, results showed a sharp decrease of bubble velocity, in the range of 283-75 mm/s, and of liquid-side mass transfer coefficient, in the range of 5.6 ×10-4-0.4 ×10-4 m/s. This effect was observed for all surfactants studied. However, the length of the hydrophilic chain did not appear to affect the hydrodynamics of the rising bubble or the oxygen transfer at the same bulk concentration. Furthermore, for the same bulk concentration, increasing the hydrophobic chain length had an impact on the velocity and the mass transfer coefficient of oxygen. Finally, the Sherwood number was calculated in each medium and compared with classical correlations for gas-liquid mass transfer prediction. Those correlations seemed to reach a limit for a very concentrated medium