While high jet velocities in the fluidized bed and impingement
dryers increased the drying rate, they also led to greater shrinkage,
even at relatively short drying duration. In a study conducted on
quality of infrared dried apple slices, Nowak and Lewicki (2005)
reported that, the damage to tissue structure is much greater at
high drying rates, which leads to greater shrinkage when compared
to that at lower drying rates.