Q. A flocculation tank contains 1800 m3 of water, which is mixed using paddles at an average velocity gradient G of 100/s. The water temperature and the corresponding dynamic viscosity are 30oC and 0.798×10-3 Ns/m2, respectively. The theoretical power required to achieve the stated value of G (in kW, up to two decimal places) is
Ans: 14.36
Sol:
Volume of the tank (V) = 1800m3
Velocity gradient (G) = 100/s
Dynamic viscosity (μ) = 0.798×10-3 Ns/m2
Power (P) = μVG2