Answer Happy

-. (a) The bottom of a pan is made of a 4 mm thick aluminium layer. In order to Increase the rate of heat transfer through the bottom of the pan, someone proposes a design for the bottom that consists of a 3 mm thick copper layer sandwiched between two 2 mm thick aluminium layers as Illustrated in Figure Qi(a)Will the new design conduct heat better? Explain your answer. (5 Aluminium 2 mm 3 mm Copper 2 mm Figure Q1(a) (b) The local atmospheric pressure Aviemore in Scotland is 98.4 kPa. Air at this pressure and at 30°C temperature flows with a velocity of 6 m/s over a 2.5 m x 8 m flat plate whose temperature is 120°C. (12) (1) Determine the rate of heat transfer from the plate if the air flows parallel to the 8 m long side. (II) Determine the rate of heat transfer from the plate if the air flows parallel to the 2.5 m side. Consider that the flat plate is not long enough to ignore the laminar flow layer. What will be the rate of heat transfer if the laminar flow layer is ignored? (8)