Particle deposition in a high temperature fully developed turbulent channel flow*

Deposition of particles through turbulent boundary layers onto external surfaces is infamous for its catastrophic effects in spacecraft landings, jet engine deposition, and more. To reproduce a relevant environment for these extreme conditions, a high temperature 2D fully developed channel was constructed to focus on the temperature effects in particle deposition. The temperature of the facility is systematically varied between the glass-transition point ([endif]-->) and melting point ([endif]-->) of the soda-lime glass beads used for these experiments. The Lagrangian trajectories of these particles as they approach and collied with the wall were acquired using a particle tracking algorithm. The deposition pattern was measured using a Digital Image Project technique (DIP), which obtained the time-resolved evolution of the topography of deposition. The final deposition composition is provided by a micro-CT scanner, which allows us to determine the deformation of softened particles as they collide with one another. The results from this facility will provide valuable data that will lead to a better understanding of particle-turbulence interactions and how temperature changes the deposition pattern and growth by affecting the particle sticking probability.