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!

Homework Help: Reynolds number

  1. Nov 15, 2005 #1
    Hi, this is going to sound very stupid.
    Is Red the same as Re?
    Its just that in some equations, I have Red, and then in others Re. It might not sound like much of a problem, but I'd really appreciate if someone could clear things up for me. Thanks!
  2. jcsd
  3. Nov 15, 2005 #2


    User Avatar
    Science Advisor

    Reynolds number with a subscript usually pertains to the RE with respect to a particular characteristic dimension of an object. For example, in a lot of problems looking at flows past flat plates, you will see [tex]RE_x[/tex] for the RE along the length of the plate measured from the leading edge of the plate. Perhaps the usage in your case is the flow past a cylinder or sphere.
    Last edited: Nov 15, 2005
  4. Nov 15, 2005 #3
    ohh right. Diameter, that's what it stands for. Its pipe flow. Thanks!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook