Question

Q2). Figure 1 shows the hydrometer test results after 50minutes from the beginning of the sedimentation. 100 Figure 1. Hydrometer placed inside the sedimentation cylinder Obtained test results as follows: • Gs = 2.72 • Temperature, T = 24 °C • L = 11.6cm Determine the size (Diameter, D) of the smallest-size particles that have settled beyond the zone of measurement at the time of 50min?

Answer 1

Griven :- Gs = 2.72 X L = 11obcom T= 24°C t = 50 mins 2 ,, osity of water :- At T = 24°C, kinematic viscosi » = 0.9131 mm mm2/sec ec Law :- By stokes' Settling velocity, Vs = D² (G-1)g 182 D in mm D? (G-1g . 누 18 » D? (mm2) x (2.72-1) * 9.8) (en - 11.6 (cm) 50 lmins) 18 x 0.9131 mm sec D? x 1.72 x 9,81 0.232 11 cm min sec 18 x 0.9131 0.232 cm min um mir D’x 1.72 x 9.81 x / 100X60) 18 X 0.913) X _3 D = 6.137 x 10 mm Ans