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!

Turbulent boundary layer

  1. Apr 17, 2009 #1
    Hey, in my lecture notes, it states that at high Re numbers, the boundary layer becomes turbulent and friction drag increases.

    I am confused about why it is the friction drag that increases but not the pressure drag? I thought pressure drag is related to turbulence? It would make sense if the sentence states, at high Re numbers, the friction drag increases. This is because high Re number = less boundary layer = steeper velocity gradient = high sheer force = more friction drag but I just don't understand how friction drag would increase with turbulence in the boundary layer.

    Thank you in advance.
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted