Discussion
In impingement dryers, the typical air temperature range is typically 100-350°C and jet velocity is _____
Answer: C
The jet velocity is 10-100 m/s.
Impingement dryers blow high-velocity jets of hot air from nozzles or slots directly onto the product surface. The jets break up the boundary layer of still air at the surface, giving very high heat and mass transfer rates. To do that, jet velocities typically run from about 10 m/s to as high as 100 m/s, with air at 100 to 350 degrees C.
2 to 7 m/s is the velocity of ordinary through-flow and cross-flow dryers, too low to produce the impingement effect.
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