Problem 2 = 3 A flat plate with length and width of 1 m is kept at constant surface temperature, T. 230 C, by independent heating elements with width of 1 m and length of 50 mm cach. They are aligned along the plate and air at 25 C flows in parallel over them in the length direction with speed of 60 m/s. Air is assumed to have the following properties: p = 0.8711 kg/m, (p = 1014 kJ/kg-K, u = 230.1x10-7 Pa-s and k = 33.8x10-3 W/m-K. a. The flow over the first heating element is assumed to be laminar. How large is the heat rate from this item? Hint: You can calculate the average Nu for the first element using the appropriate correlation b. At which element does the flow switch to turbulent? Hint: You can calculate me and find the number of the element in that position. c. Is the heat rate the same at each element? Why