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**Hello,**

Im having some issues with my task.

1. Homework Statement

Im having some issues with my task.

1. Homework Statement

The heat generation rate of a cylindrical fuel (D=0.2 m and 1 m long) is 160 kW.

The thermal conductivity of the fuel is 100 W/mK and its surface temperature is

maintained at 283 K. Determine the temperature at the axis.

## Homework Equations

I tried to use this equation: 0=(1/r)*(d/dr)*(r*dT/dr)+q/k and Ive added the volume to it

-->

**0=(1/r)*(d/dr)*(r*dT/dr)+q/(k*V)**[/B]

## The Attempt at a Solution

im getting this at the end: T(r)=-1/4*q/(kV)*r

^{2}+ c

_{1}*ln(r) + c

_{2}

i wanted to use the boundary condition that for r=0 ---> T=283K, but i cant type ln(0) into my calculator.

I dont know how to go on.

Best regards