Effects of Nanoparticles on Liquid Feedstock Behavior in High Velocity Suspension Flame Spray Process
Effects of Nanoparticles on Liquid Feedstock Behavior in High Velocity Suspension Flame Spray Process
Wednesday, May 13, 2015
Exhibit Halls A&B (Long Beach Convention and Entertainment Center)
Suspension feedstock in high velocity oxy-fuel flame jets has opened a new area of research with great potential for advanced coatings.
Understanding the suspension behavior in such a multidisciplinary process is a key factor in producing repeatable and controllable coatings.
In this study, the effects of solid nanoparticles, suspended in liquid feedstock, on suspension fragmentation, vaporization rate and gas dynamics
are investigated in the high velocity suspension flame spray (HVSFS) process. The results show that small droplets carrying high nanoparticle concentrations
develop higher surface tension and result in less fragmentation. The recommended ethanol droplet size at high nanoparticle loadings is found to be 50 µm due to
the high evaporation rate in the mid-section of the nozzle. For larger droplets, severe fragmentation occurs inside the combustion chamber (CC) while complete
evaporation takes place in the free jet region outside the gun.