A multi-tray settling chamber handles 6 m3/sec of air at 20° C. There are 8 trays including the bottom surface spaced 0.25 m apart. The chamber is 4m long and 1m wide. For particles of density 2000 Kg/m3 and sizes a) 70 and b) 25\mu m. calculate residence time (t), the distance settled (y) and the efficiency of collection (\eta). Is the tray spacing sufficient to collect all the particles of each size? Assume Laminarflow. What will be the efficiency if the flow regime is turbulent in each case?