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Dimensionless Numbers
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The
dimensionless numbers, Nh, Nq, Np, and
Eff
describing the performance of pumper impellers have been shown
and discussed in another presentation. All pumpers can be
described by these 4 numbers. Like pump curves, SX pumper curves
are characteristic of the impeller design. Each impeller design
will have its own characteristic curves. The curves are identical,
when done without dimensions, for the same pumper design,
regardless of size of equipment.
Hydraulic efficiency, Eff, is a parameter that helps describe
the performance of a pumper design. Usually, the higher
the efficiency, the smaller the entrainment and the droplets are
more uniform and larger. Low efficiencies typically mean the
system will have high entrainments and does not operate as good as
it can. Since hydraulic efficiency is determined from Nh, Nq and
Np, each impeller design has its own characteristic efficiency
curve.
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| Each impeller design will have its
own characteristic hydraulic efficiency curves.
Ref. 29 |
These were derived by scale-down lab experiment. How can
you use CFD instead of lab experimenting? Please continue.
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