Shrinkage behaviour of skim milk droplets during air drying

► Temperature effects on droplet shrinkage of 50 wt.% skim milk during drying. ► Shrinkage behaviour of high solids content deviated from ideal shrinkage kinetics. ► Rapid shell formation maintained spherical shape and hindered solute diffusion. ► Effects of solids content on particle formation were discussed. ► A general correlation of shrinkage kinetics at 10-50 wt.% solids range was reported.