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!

Polarisation of heat waves

  1. Sep 27, 2012 #1
    we know that heat is caused by vibration of molecules. the vibration by nature of molecules is random. but in as in polarized light can we give heat that is vibration a particular direction. then this vibration i call polarized heat has varying temp at various angles. can this be actually made true.
     
  2. jcsd
  3. Sep 27, 2012 #2

    davenn

    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    interestings question....
    Am not an expert in this area but I suspect there are 2 parts to this question

    1) in an object say a chunk of heated iron, the heat is being generated by the motion/vibration of atoms/molecules ( small scale/large scale)

    2) but the radiated heat we feel is primarily infra-red radiation, which is electromagnetic in nature and that can be polarised

    lets see how the more knowledgeable answer this :)

    Dave
     
  4. Sep 28, 2012 #3

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    If you model heat transport with phonons, then yes- phonons have a polarization state.
     
  5. Sep 28, 2012 #4

    mfb

    User Avatar
    2017 Award

    Staff: Mentor

    I would expect that those phonons scatter quickly and distribute the energy in all directions. The timescale would be similar to the damping of sound in solids (many similar phonons), so probably <1s unless some specific setups can increase it (?).
     
  6. Sep 28, 2012 #5

    DrDu

    User Avatar
    Science Advisor

    Heat itself doesn't have temperature.
    As far as electromagnetic radiation is concerned, only isotropic blackbody radiation has a well defined temperature. You may put a polarizer in an oven, but it won't change the polarization or temperature of the blackbody radiation once it has the same temperature as the oven. So the answer is negative, you can't create polarized radiation with a well defined temperature.
     
  7. Nov 4, 2012 #6
    if heat can be polarized then i believe the temperature of space occupying polarized heat will be different in different direction for every point in it. so using this concept we possibly create a engine at least in theory which will be 100% efficient.
     
  8. Nov 4, 2012 #7

    mfb

    User Avatar
    2017 Award

    Staff: Mentor

    This would still need a perfect heat dump at 0 temperature, which does not exist in our universe.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...
Similar Threads for Polarisation heat waves Date
B Heating a Lamp Saturday at 11:23 AM
B Why do signals to tv aerials need to be polarised? Feb 4, 2018
I How polarizers reflect light Jan 31, 2018
I Is this image of a polarizer misleading? Jan 29, 2018
B Photon absorbtion and conservation Dec 18, 2017