Consider a 1D planar wall of thickness L with thermal conductivity k_1. The system is described by the following governing equation, boundary and initial conditions: (^2 T)/(x^2 )=1/ T/t -k_1T/x=h_1(T_-T(x=0)) x=0,t k_1T/x=const>0 x=L,t T(x,0)=T_0 t=0,x[0,L] Assume T_0