How can I apply code ?

If the plane wall mentioned in problem (8) is subjected to two fluids at both sides. The fluids have convective heat transfer coefficients of 8 & 16 W/m2.K, and temperatures of 110 & 15 °C. Write the boundary conditions for the heat transfer process, and then estimate the temperature distribution and the rate of heat transfer per unit area in W/m2.

[Geoff Hayes]

Abdelrahman - rather than posting your homework question, why not discuss the problem you are having with writing the code to determine the solution?