1. Not finding help here? Sign up for a free 30min 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!

Rectangular Fin Heat Transfer

  1. Mar 20, 2013 #1
    1. The problem statement, all variables and given/known data
    A straight, rectangular fin made from 2024 aluminium has a thickness of t = 3mm and length L = 20mm. Base temperature is 100 °C and it is exposed to a fluid at 20 °C.
    h = 60 W/m^2-K
    k = 185 W/m-K

    (a) Determine the heat transfer rate from the fin to the fluid per unit length
    (b) Repeat (a) if the fin is made of copper (h = 400 W/m^2-K)

    2. Relevant equations

    ηo = 1 - (NAc/At) (1-ηf)
    At = NAc+Ab

    3. The attempt at a solution

    nf = tanh(mLc)/mLc

    (I know this equation is right, but I'm lost from this point forward. Any help would be excellent.)
     
  2. jcsd
  3. Mar 20, 2013 #2

    Chestermiller

    User Avatar
    Insights Author

    Staff: Mentor

    Do you know how to write the steady state differential heat balance equation for a cooling fin, including the conductive heat transfer along the fin and the convective heat transfer from the fin to the surrounding air? If so, lets see it.

    Chet
     
  4. Mar 20, 2013 #3
    There's formulas for this...it's really plug and chug, you're given everything you need.

    You need to calculate your m and M

    for a rectangular fin m=(2h/kt)^1/2; plug in your h, k and thickness

    For a rectangular fin M= (2hw^2tk)^1/2 *(tb-tinfinity) again substitute your h,k, width and thickness.

    Now that you have M and m you can just apply the formula, you have everything you need.
     
    Last edited: Mar 20, 2013
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted
Similar Discussions: Rectangular Fin Heat Transfer
  1. Heat Transfer (Replies: 2)

Loading...