© 31% D 7:45 Hint: 1. Use the moody chart to calculate the friction coefficients and subsequently the head losses for both pipe cases. 2. Compare the power requirements for each scenario and use that...

Fluid Mechanics

Extracted text: © 31% D 7:45 Hint: 1. Use the moody chart to calculate the friction coefficients and subsequently the head losses for both pipe cases. 2. Compare the power requirements for each scenario and use that to calculate the savings in energy. [20] QUESTION 5 A circular tank of diameter 80 cm contains water up to a height of 12 000 mm. The tank is provided with an orifice of diameter 0.1 m at the bottom. Find the time taken by water. (i) to fall from 12 000 mm to 2 000 m (ii) for completely emptying the tank. Take Ca = 0.57 [10] QUESTION 6 In a free cylindrical vortex flow, at a point in the fluid at a radius of 0.20 m and at a height of 0.1 m, the velocity and pressures are 10 m/s and 1.1618 atm absolute. Find the pressure at a radius of 400 mm and at a height of 200 mm. The fluid is air with density equal to 1.24 kg/m3 [10] 5 Formulae Sheet Flow in pipes and Bernoulli Equation + z, = +*+ 22 + h, + Ehị pg pg 29 Q = VA m = pVA 5 of 10 Small Diamter + 2 (thickness) = Bigger Diameter P2 - P = pgh (P2 – P1)ar* Lamina Ela Data ||