Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Centrifugal Pumps and Influence from Viscosity

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

Sponsored Links

When a more viscous fluid is handled by a centrifugal pump

  • brake horsepower requirement increases
  • the head generated is reduced
  • capacity is reduced
  • efficiency of pump is reduced and the Best Efficiency Point - BEP - is moved

The head, flow and capacity with fluids with other viscosities than used in the original documentation can be modified 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                               (2)

where

hv = head compensated for viscosity (m, ft)

ch = viscosity head coefficient

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

Efficiency

μv = cμ μ                             (3)  

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)                            (4)

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)                              (5)

where

Pv = power compensated for viscosity (bhp)

SG = specific gravity of viscous fluid

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

4 12

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more