1. Limited time only! Sign up for a free 30min personal 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!

Fluids- hydrodynamic interactions

  1. Oct 20, 2009 #1
    If we consider a system of N suspended particles diffusing through a narrow channel. What happend if the hydrodynamic interactions are neglected? Is there only flow? How can the particles diffusse without flow?
     
  2. jcsd
  3. Oct 20, 2009 #2

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor
    2016 Award

    Are you asking what happens in the limit of dilute particles- in other words, that the motion of one particle does not affect the motion of neighboring particles? That's usually what is meant by 'hydrodynamic interaction'.
     
  4. Nov 14, 2009 #3
    It is know, that when one consider a suspension of particles. The motion of a given particle induces a flow field in the solvent, which will be felt by all the other particles. As a result these particles experience a force which is said to result from hydrodynamic interaction with the original particle.

    Then, in the case that there is not hydrodynamic interactions, then the particles cannot move, or they move due to the flow or due to other effects?
    or maybe in other words, if there is not flow field, then there is no hydrodynamic interactions, and then why the particles move?
     
  5. Nov 14, 2009 #4

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor
    2016 Award

    If I understand you, if there is no hydrodynamic interaction, then each particle interacts with a flow field that is unaltered by the addition of other particles. Deiter Langbein has a couple very nice articles showing coupling effects for two spheres moving in a fluid, for various configurations of the spheres (parallel, series, etc).

    As for your last sentence, think of settling.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Fluids- hydrodynamic interactions
  1. Hydrodynamic limit (Replies: 2)

Loading...