2.4 Data collection and analysis
1) Parameters of droplet deposition distribution
The parameters of droplet deposition distribution,
such as droplet coverage, droplet deposition density and
droplet size were analyzed by the image processing
software Image J.
Droplet coverage: The percentage of the chemical
area covered on the paper card.
Droplet deposition density: The number of droplet
deposition per unit area on the paper card.
Droplet size: That is, the length’s mean diameter
which is the sum diameter divided by the number of
particles.
2) Droplet deposition distribution uniformity
The coefficient of variation (CV) was used for
evaluating the uniformity of droplet deposition
distribution. The formula for calculating CV is: