Figure 2: Effect of processing aids on initial drying rate: 1) is stationary bed (0.7 m/s air velocity) 2) is fluidized bed (0.93 m/s air velocity) and 3) is vibrofluidized bed (0.7 m/s air velocity). Product- Acid casein, Particle size - 3.075 mm, Bed weight - 0.7 kg, Bed area - 0.0552 m2, Air temperature - 63.7 C, Ri - kg water evaporated/ kg bone dry material per m2 per hour.