A 10-cm-long bar with a square cross-section, as shown in Fig. P3184, consists of a 1-cm-thick copper

Question:

A 10-cm-long bar with a square cross-section, as shown in Fig. P3–184, consists of a 1-cm-thick copper layer (k = 400 W/m · K) and a 1-cm-thick epoxy composite layer (k = 0.4 W/m · K). Calculate the rate of heat transfer under a thermal driving force of 50°C, when the direction of steady one dimensional heat transfer is

(a) From front to back (i.e., along its length),

(b) From left to right,