Flowability decreased with increasing storage period more so at higher temperatures. Irrespective of storage temperatures, samples packed in polystyrene registered a high loss of flowability during storage.
Angle of repose (tan θ) increased from 62.93 to 66.16 in spray dried malted milk food on storage at 30 °C for 12 months.
A gradual loss of flowability in lactose hydrolyzed infant formula on storage at 30 °C for 12 months.
These results are consistent with those reported by Peleg [30]; increase in free fat content and changes in particle structure due to moisture absorption during storage could increase cohesiveness of powder leading to reduction in flowability.
Moist powder exhibited higher angle of repose (mainly due to cohesion), despite the fact that the angle of internal friction usually decreases with increase inmoisture level.