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

Convection question

  1. Nov 18, 2007 #1
    Hi, I was wondering if someone could help explain how the following shapes would affect convection. What it is is a heat plate with nothing, a bundle of tubes, and just fins. It's in a vertical tube and the air flows upwards. I understand convection but I don't get how it would be affected in terms of a physical object such as these in its path.

    http://img231.imageshack.us/img231/718/heatplatesf1.jpg
     
  2. jcsd
  3. Nov 22, 2007 #2

    Gokul43201

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    The rule of thumb I use is that flow lines just downstream of an obstacle get very close to their far-away away structure within a distance comparable to the width of the obstacle. So if the tubes have a diameter d, then at a distance d downstream from each tube, the flow-lines are essentially homogenized again. For some shapes (tear-drop, for instance), this distance can be much smaller than the width of the object.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?