In a one-dimensional flat wall with a thickness of 1 and a coefficient of thermal conductivity k. steady- state thermal conductivity takes place, in which the temperature of the wall is a function only of the coordinate x (it varies with the thickness of the wall), TX). There is no internal heat source in the wall. The surfaces at x = 0 and x = 1 are isothermal: T(0) > T(L) On the surface at x = L, the heat flow is transferred to a fluid with temperature T. y.T Tx-0 I. 0 Tx=L Q L Too