4.6 Design a Lapple conventional cyclone to function as a precleaner. The particles have a density of 1250 kg/m, and have the same size distribution as in Problem 4.4, but the air is at 150 F and 1 atm, and is flowing at 2000 acfm. The cyclone need be only 65- 75% efficient. Specify your final choice of body diameter and the corresponding efficiency. 4.4 Recalculate the efficiency of the cyclone of Problem 4.2 for the fol- lowing particle size distribution. Size Range, um 0-2 Mass Percent in Size Range 4.0 2-6 16.0 6-12 20.0 12-20 20.0 20-40 20.0 40-80 18.0 80 2.0