A filter bed is composed of 12 inches of uniform anthracite with an average size of 1.6 mm for a filtration rate of 4 gal/ft2/min (or 160 L/min/m2) (temperature is 20°C; particle shape factor: 0.50; kinematic viscosity: 1.091 × 10-5 ft2/s). Calculate Reynolds number ?
1
2.0
2
2.15
3
2.3
4
3.0