1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Fluid equation

  1. Aug 25, 2008 #1
    1. The problem statement, all variables and given/known data

    Tau = (some constant) * Nu

    2. Relevant equations

    Shear stress = (some constant) * Kinematic Viscosity

    3. The attempt at a solution

    n/a

    Thanks!
     
    Last edited: Aug 25, 2008
  2. jcsd
  3. Aug 25, 2008 #2
    Is it simply shear rate? o_O?
     
  4. Aug 25, 2008 #3

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    I honestly cannot tell what question you are asking!
     
  5. Aug 25, 2008 #4
    Shear stress = (some constant) * Kinematic Viscosity

    I am looking for (some constant)'s name.
    I remember seeing this equation and I just can't remember this constant's name...(or perhaps what that is called.)

    I am thinking the shear rate(?).
     
  6. Aug 25, 2008 #5

    stewartcs

    User Avatar
    Science Advisor

    For a Newtonian Fluid, it is the shear rate.

    http://en.wikipedia.org/wiki/Newtonian_fluid

    CS
     
  7. Aug 25, 2008 #6
    Newtonian Fluid is linear so I guess the shear rate is wrong(?).
    If it's non-Newtonian Fluid, is there such constants that goes right in?
     
  8. Aug 26, 2008 #7

    stewartcs

    User Avatar
    Science Advisor

    In a Newtonian Fluid the relationship between the shear stress and strain rate is linear. The constant of proportionality is the viscosity. That's why it is linear. The shear rate is used in the equation you where asking about.

    In Non-Newtonian Fluids, the viscosity is dependent on the relationship between the shear stress and strain rate which is non-linear.

    CS
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Fluid equation
Loading...