3. Consider a vertical plate of dimension 0.25m x 0.50m that is at T = 100 °C in a quiescent environment at T = 20 °C. In the interest of minimising heat transfer from the plate, which orientation, (A) or (B), is preferred? What is the convective heat transfer rate from the front surface of the plate when it is in the preferred orientation?

Fig: 1

Fig: 2