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

How do you calculate heat flux through a piece of metal?

  1. Oct 21, 2010 #1
    How do you calculate heat flux through a piece of metal??

    Hello,
    I need to calculate heat flux in W/m2 through a small cylindrical steel bar measuring 12mm length x 2mm diameter. At one end of the bar the temperature is 31C (the heated side) and at the other end it's 28C.

    How do I calculate the heat flux in the above scenario? Is it possible? I'm guessing that I need to know the thermal conductivity of the steel at least?

    Any assistance would be much appreciated.
    Many Thanks
     
    Last edited: Oct 21, 2010
  2. jcsd
  3. Oct 21, 2010 #2

    Mapes

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Re: How do you calculate heat flux through a piece of metal??

    Hi Con?used, welcome to PF!

    You do indeed need to know the thermal conductivity. The heat flux q is given by Fourier's Law:

    [tex]q=-k\frac{dT}{dx}=-k\frac{T_2-T_1}{\Delta x}[/tex]

    where k is the thermal conductivity. Does this answer your question?
     
  4. Oct 25, 2010 #3
    Re: How do you calculate heat flux through a piece of metal??

    Thanks Mapes
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook