# Homework Help: Fourier's Equations: difficult problem

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1. Jul 11, 2016

### argpirate

1. The problem statement, all variables and given/known data
So I have a problem where I have a series and two other parallel insulators bringing a system from a temperature of Tzero to Ttwo. However, the two aforementioned temperatures have a huge difference thus causing kappa to vary with temperature. I am trying to know how to solve for Q/t of the whole system accounting for the varying kappa with temperature (assume the kappa function is linear with temperature change (y=mx+b form)). So I have a cylinder that is in series (2*pi*r*L) and top and bottom that are parallel but not series (disks with thickness).
2. Relevant equations

3. The attempt at a solution
I serperated and integrated. I set Q/t=Q/t for the series from where they change. The difficulty I have is coming up with the general form (T-t)/R and using that to do stuff.

2. Jul 11, 2016

### Staff: Mentor

Is this a transient problem or a steady state problem?

3. Jul 14, 2016

### rude man

I think we need a picture ...