Question 5 Figure 6 shows a non-circular section where ethylene glycol (sg = 1.10) of 77F flows around the tubes and inside the rectangular passage. All surfaces are brass. a. Calculate the cross-sectional area, the welted perimeter and the hydraulic radius of the surface [6 marks] b. Calculate the volume flow rate of the ethylene glycol required for the flow to have a Reynolds number of 8000. [6 marks) c. Calculate the energy loss over a length of 3.2512 m. [8 marks] The density of ethylene glycolis 1100 kg/m' and the dynamic viscosity is 1.62 x 102 Pas. The roughness. E, is 1.5 x 10-6 38.1 mm 9.525 mm - OD 57.15 mm 1.2446 mm -in - wall thickness brass tubes Figure 6