At very high
temperatures, as evaporation rates are faster, products dry to
a more porous or fragmented structure and implying a lower
shrinkage of the droplets, and so a lower density of the powder.
Increasing the drying air temperature generally produces
an increase in particle size (Walton, 2000). Large particles may
sink, whereas small ones are dustier and generally float on
water, making for uneven wetting and reconstitution. Chegini
and Ghobadian (2005), and Quek et al. (2007)