Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Significance of Perfect Fluid

  1. Jul 10, 2015 #1
    So the textbook I am reading says that a perfect fluid cannot sustain shear stress, or that [tex] p_{yx}=2\mu \dot \epsilon_{yx} =0[/tex], where [itex] \mu [/itex] is the viscosity, and [itex] \dot \epsilon_{yx} [/itex] is the rate of angular deformation. Then it says when [itex] \dot \epsilon_{yx} =0[/itex], this means that "two adjacent horizontal layers of a perfect fluid can move at different velocities without one layer affecting the other layer through internal resistive stresses." This seems to me, however, like what would happen if the viscosity were zero.

    Can someone clear up my misconception?
     
  2. jcsd
  3. Jul 10, 2015 #2

    Orodruin

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Viscosity is zero in a perfect fluid. The situation described is not ##\dot\epsilon_{xy}=0## but ##\neq 0##.

    Edit: Why is \eps not a standard TeX command yet???? :headbang:
     
  4. Jul 10, 2015 #3
    I think ideal fluids are a subset of perfect fluids, at least according to my book.
     

    Attached Files:

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




Similar Discussions: Significance of Perfect Fluid
  1. Significant Numbers (Replies: 5)

  2. Significant digits (Replies: 2)

  3. Significant Digits (Replies: 11)

  4. Significant Figures (Replies: 5)

Loading...