High-speed cameras can provide a quick evaluation of certain spray nozzle characteristics (cone of spray, concentration, trajectory, droplet formation). The atomization and spray plume development of liquids exiting spray nozzles can be easily visualised and qualitatively assessed. Some image-based measurements can also be performed (cone angle, velocity).
Filming sprays has been a frequent application for Slowmo for many years. Lighting is extremely important when filming sprays. A spray’s shape and distribution will appear different under various lighting conditions and backgrounds. A spray can be either front lit or backlit depending on what needs to be seen as well as camera access.
A short shutter speed is required to show the droplet detail within the spray plume itself. Frame rates in the order of 5000fps to 15000fps tend to be used for manual sprays.