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Fluid flow through an orifice

  1. Jan 5, 2010 #1
    hello all,

    i need to calculate the size of an orifice that will pass a certain volume of a viscous fluid

    per time of say 10 seconds

    pressure and viscosity are the variable values.

    the application is in the design of a valve for dispensing accurate amounts of
    a liquid of a given viscosity. (the liquid is polyurethane prepolymer which is a sticky
    fluid of which the viscosity is always known but varies from batch to batch)

    the viscosity changes with temperature

    Can anyone please suggest a formula ?

    Best regards

    fred evans

    ( this is my first post-- and I see i can attach 5 tags-- what is a tag?
  2. jcsd
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