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A suspension of sand like particles in water with particles of diameter 0.10 mm and below is flowing into a setting tank at 0.10 m³/s. Assume g = 9.81 m/s², specific gravity of particles = 2.65, and kinematic viscosity of water = 1.0105 × 10–2 cm²/s. The minimum surface area (in m²) required for this settling tank to remove particles of size 0.06 mm and above with 100% efficiency is _________
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- 31.09 m²
- 32 m²
- 31.21 m²
- 30 m²
Correct Option: C
31 to 32
| Vs = | (s - 1)d² | |
| 18J |
| = | × (2.65 - 1) × (6 × 10-2)² | |
| 18 × 1.0105 × 10-2 |
= 3.204 × 10–3m/s
| Vs = | ||
| BL |
BL = surface area
| ∴ BL = | = 31.21 m² | |
| 3.204 × 10-3 |
