5.3 Flow Which Connecting 2 Reservoirs

5.3 FLOW WHICH CONNECTING 2 RESERVOIRS

                                             Energy equation   from A to B:

Head loss at entrance and submerged discharge

Step to find the answer :

EXAMPLE 1

Determine the difference level between 2 reservoirs which is connected by single pipe of cast iron for 1 km. Discharge and diameter is given as 0.01 m3/s and 5 cm respectively. 

(   =1.14 x 10-6 m2/s)  

SOLUTION EXAMPLE 1

EXAMPLE 2

—A tanker is to be filled with fuel oil with ρ = 920 kg/m³ and m = 0.045 kg/m.s from an underground reservoir using a 25m long, 4 cm diameter plastic hose with a slightly rounded entrance and two 90º smooth bends.

—The capacity of the tanker is 18 m³ and the filling time is 30minutes.

—Assuming an overall pump efficiency of 82%, determine power input 

  to the pump.

SOLUTION EXAMPLE 2

—The loss coefficient is KL = 0.12 for a slightly-rounded entrance and KL = 0.3 for a 90° smooth bend (flanged). The plastic pipe is smooth and thus ε = 0.

—Points 1 & 2 is open to the atmosphere; P1 = P2 = Patm

—Velocity at point 1 is zero; V1 = 0.