Part I. A multi-tray settling chamber is to be designed to handle 20m3/s of air at 293K. The minimum particle size that can be collected at 100% efficiency is estimated to be 58m of density 2000kg/m3. If the chamber is 2m wide (W),4m long (L), and the trays are to be spaced 0.5m apart (H), assuming laminar flow inside the chamber and density of the gas (g)=0, how many trays will be required? (Data: g at 293K=1.81105kg/m.s, kinematic viscosity of air (g/g) =1.51105m2/s, also H=nH ). Part II: Is the laminar flow assumption justified? Show it using proper calculations. If not, then with the above calculated number of trays, what will be the collection efficiency of the chamber if 45m particles are to be removed? [5+5=10 marks ]