Page 235 - Fluid mechanics, heat transfer, and mass transfer
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TWO-PHASE FLOW 213
FIGURE 7.14 Pneumatic conveyance: negative system.
& Nitrogen might be used to avoid explosions if air is & Beyond minimum fluidization velocity, there will be
used with combustible solids. moving bed flow.
& The gas is recycled instead of releasing to atmosphere. & At higher gas rates, solids are carried in gas as slugs.
. Describe different flow conditions that occur as gas This is called slugging dense phase flow.
velocity is increased in a pneumatic conveyor.
FIGURE 7.15 Pneumatic conveyor: positive system.
