ple gravity collector, having a height of 4 m, can remove 95% of 40 um sized particles dust. Density of the particle and viscosity of air is 15 3 and 1.610-5 m2/s, respectively. The gas enters the gravity collector at a bulk velocity of 1 m/s. Considering three trays being used for efficiency, estimate the length of the gravity collector. Assume bottom floor as an additional tray. Neglect the density of air. [7] 425182 A simple gravity collector, having a height of 4 m, can remove 95% of 40 um sized particles dust. Density of the particle and viscosity of air is 1500 kg/m and 1.6'10% ms, respectively. The gas enters the gravity collector at a bulk velocity of 1 m/s. Considering three trays being used for the same efficiency, estimate the length of the gravity collector. Assume bottom floor as an additional tray. Neglect the density of air. 171