Part I. A multi-tray settling chamber is to be designed to handle 20 m/s of air...
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Part I. A multi-tray settling chamber is to be designed to handle 20 m/s of air at 293 K. The minimum particle size that can be collected at 100% efficiency is estimated to be 9.89 m of density 1500 kg/m' If the chamber is 5 m wide (W), 10 m long (L), and the trays are to be spaced 0.15 m apart (AH), assuming laminar flow inside the chamber and the density of the gas much smaller than the density of the particle, how many trays will be required? (Data: g at 293 K = 2 x 10 kg/m.s, the kinematic viscosity of air (u/pg)=1.51 x10 m/s, also H= nAH). Part II: s 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 45 m particles are to be removed? (4+4=8 marks] Part I. A multi-tray settling chamber is to be designed to handle 20 m/s of air at 293 K. The minimum particle size that can be collected at 100% efficiency is estimated to be 9.89 m of density 1500 kg/m' If the chamber is 5 m wide (W), 10 m long (L), and the trays are to be spaced 0.15 m apart (AH), assuming laminar flow inside the chamber and the density of the gas much smaller than the density of the particle, how many trays will be required? (Data: g at 293 K = 2 x 10 kg/m.s, the kinematic viscosity of air (u/pg)=1.51 x10 m/s, also H= nAH). Part II: s 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 45 m particles are to be removed? (4+4=8 marks]
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