The index values were calculated so that when Y< 1 drying is difficult,
Y1 indicates a marginally successful drying,
and Y> 1 a successful drying. Powder recovery was
again used as the criterion for spray drying performance.
Eq. (7) was found to be useful in determining
optimum additive requirements for honey and pineapple
juice drying (Bhandari et al., 1997b).