A compact pneumatic pulse-jet pump with a Venturi-like reverse flow diverter
which consists of a nozzle and diffuser
is designed for lifting and transporting a hazardous fluid through a narrow mounting hole.The pumping performance for a liquid mixture or a liquid-solid mixture is examined in terms of the effects of liquid viscosity
particle mass concentration
lifting height
and compression pressure.Results reveal that the pumping performance of the compact pneumatic pulse-jet pump is controlled by jet inertia and the flow resistance of the riser tube positioned after the diffuser.The capacity of the compact pneumatic pulse-jet pump increases with compression pressure and decreases with liquid viscosity.However
even for a liquid mixture with a high viscosity of 7.38 mPa·s
a pumping capacity of 170.7 L·h
-1
was observed.For a liquid mixture
two dimensionless indices of performance were found to be the ratio of Euler numbers
Eu
out
/
Eu
DV
and the suction factor
q
.As the liquid-solid mixture was lifted to elevation of 6.74 m by the compact pump
the particle size distributions of the liquid-solid mixture in the tank and from the riser tube outlet were determined by a particle size analyzer and found to coincide well.
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