Centrifugal Pumps and Viscosity

When a liquid flow through a pump, hydrodynamic losses depends on fluid viscosity

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When a viscous fluid is handled by a centrifugal pump

centrifugal pump viscosity fluids

The head, flow and capacity at other viscosities than used in the original documentation can be modifying with coefficients.

Flow

qv= cq q  (1)

where

qv = flow compensated for viscosity (m3/h, gpm)

cq = viscosity flow coefficient

q = original flow according pump curve (m3/h, gpm)

Head

hv= ch h  (1)

where

hv = head compensated for viscosity (m, ft)

ch = viscosity head coefficient

h = original head according pump curve (m, ft)

Efficiency

μv= cμ μ  (1)

where

μv = effciency compensated for viscosity

cμ = viscosity efficiency coefficient

μ = original efficiency according pump curve

Power - SI units

Pv= qv hv ρv g / (3.6 106  μv) (1)

where

Pv = power compensated for viscosity (kW)

ρv = density of viscous fluid (kg/m3)

g = acceleration of gravity (9.81 m/s2)

Power - Imperial units

Pv= qv hv SG / (3960 μv) (1)

where

Pv = power compensated for viscosity (bhp)

SG = specific gravity of viscous fluid

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Related Topics

  • Pumps Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more

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