7
type of atomizers are usually used for small flow rates and particularly useful for providing uniform small
droplets of 15 microns or less
EXPLANATION
Novel Evaporation & Drying Systems
- Atomizer Types in Spray Drying:
- Two-Fluid (Pneumatic) Atomizers: Utilize high-velocity compressed air or steam to contact and shear a low-rate liquid stream into an extremely fine spray mist.
- They produce very small, uniform droplets (droplet diameters $\le 15-20\,\mu\text{m}$) and operate effectively at very small liquid flow rates, making them standard for pilot-scale, laboratory spray dryers, and specialized encapsulation feeds.
- Centrifugal (Rotary Disk) Atomizers: Handle large commercial capacities, producing droplets between $30-120\,\mu\text{m}$.
- Pressure Nozzles: Require high pressures ($10-30\text{ MPa}$) and produce larger droplet distributions.
- Correct Option: Option 3 (Two fluid atomizers).
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