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Homework Help: Measuring the thermal diffusivity.

  1. Dec 13, 2009 #1
    1. The problem statement, all variables and given/known data

    Evening everybody. I am attempting to devise an experiment in order to measure the thermal diffusivity of ice and water.

    Imagine 3 brass plates, with water held between them, in approximately a 1mm gap (dx) by surface tension.
    The 3 plates have thermocouples between them in order to tell the difference in temperature between them. The part I am miffed about is how to obtain the diffusivity from this measurement.

    I have been given this equation to link them, but I am struggling to find where it came from and the significance if the d2T/dx2

    d2T/dx2=T1-2T2/dx2+T3

    2. Relevant equations

    dQ/dT=-D dH/dx


    3. The attempt at a solution

    This is not really appropriate, as the above is an experiment plan which I have devised, I just need the final link! I apologise for not using the exact format, but any ideas or leads for me to follow up would be greatly appreciated, I've come to a dead end.


    Thankyou in advance.
     
  2. jcsd
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