Discussion
Dilute phase pneumatic conveying is characterised by
Answer: A
Correct answer: High air velocity with particles fully suspended
Dilute phase conveying carries the particles fully suspended in a fast air stream, typically 15 to 30 m/s, at a low ratio of solids to air. The velocity must stay above the saltation velocity, below which particles drop out and settle along the bottom of the pipe.
It is simple and flexible in routing, but it is energy-intensive and abrasive to both product and pipework. Dense phase conveying is the contrast: low velocity, high solids loading, material moving as plugs, gentler but requiring higher pressure.
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