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- Vacuum Cleaners centrifugal fans usually have 6-8 blades
- 50 > CFM is needed to transport sand
- Have at least a safety factor of 1.5-2 to account for frictional pressure drops in the pipes.
- In suspended flow of particles in air, the particle's velocity is 80% of that of average air velocity in horizontal pipeline
- Material to air ratio, 2:1
- Vacuum cleaners use diffusers
- Performance of a typical vacuum cleaner
- Motor and Drive Arrangements for centrifugal fans
- One Big Disadvantage of FC Fans:
- Brake horsepower overloading during free delivery, hence oversize motor is used as a precaution.
- Mitigate static pressure
- Fan Laws?
- Specific Speed and Specific Size?
- Understand static pressure better
Resources:
Bleier-FanHandbook.pdf (Great resource to understand on how centrifugal blowers/fans work and what design considerations to make)
https://www.engineeringtoolbox.com/pneumatic-solids-transports-d_134.html
https://www.cedengineering.com/userfiles/Pneumatic%20Conveying%20Systems-R1.pdf