Hi Chester,
Using you solution to the heat equation I've actually got some correct answers. I think you are most certainly right that we were suppose to wait for it to level off. However to counter for this, when taking amplitudes for each "line", I have taken the zero point at different...
Thank you very much chester.
Did you derive this from the heat equation?
I've attached a graph of one set of the results I've obtained, please ignore the lack of formatting as this is still a process undergoing!
The image shows our results from an aluminium sample with the heating element...
sorry should have written insulated not isolated. I can't see that they've got any other solutions. I've copied the link if you want to have a look. I just tried plotting a semi log graph but it was not linear.
http://acs.omnibooksonline.com/data/papers/1999_178.pdf
The bar was isolated using quite a primitive foam box. The value I found online for the thermal diffusivity of copper was 1.11E-4 M^2/S. However I calculated a value of 6.34e-4 M^2/S. The equation given was (dT/dt)=D(d^2T/dx^2) - BDT where B was a heat loss parameter
OK sorry hadn't read that bit :)
I did some research and stumbled on a paper that was doing similar but with carbon fibre strands. Using the heat equation they had derived an expression whose thermal diffusivity was equal to (l^2)/(2tln(T1/T2)), where l is the distance between 2 thermocouples...
Hi guys,
Just looking for some help with the theory on a project I've been set at university.
The experiment involved heating a long thin bar from one end with a sinusoidal heat wave. Thermocouples were then placed every 7 cm (4 in total) and temperatures were recorded. The experiment brief...