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The Darcy friction factor for both of the pipes shown is 0.038. What is the flow rate through the 250 mm pipe? (neglect minor losses through the pipe bends) Given that 1: top pipe: 325m and 150mm 2: bottom pipe: 650m and 250mm, Q-990m/h - Solution: 1. This is a pipe system 2. Flow rate mols 3. Estimation of velocity in each pipe using conservation of mass: Vim/s Q- Vym/s Hence, Q -- equation 1 4. Estimation of frictional loss in each pipe: oh .hu a hea Hence v V2: -- equation 2 5. Solve equations 1 and 2 together, we get OVE m/s 0. Solution: 1. This is a pipe system 2. Flow rate = m/s; 3. Estimation of velocity in each pipe using conservation of mass: V m3/s; o Q2= V2m/s; Hence, Q= -- equation 1 4. Estimation of frictional loss in each pipe: o hf o hii Vy? o h4,2= Vz?; Hence Via Vai -- equation 2 5. Solve equations 1 and 2 together, we get m/s OVE o V2- m/s m/s. 6. Thus flow rate through the 250mm pipe is Q2= The Darcy friction factor for both of the pipes shown is 0.038. What is the flow rate through the 250 mm pipe? (neglect minor losses through the pipe bends) Given that 1: top pipe: 325m and 150mm; 2: bottom pipe: 650m and 250mm, Q=990m 7 225m 150mm diame O ami man 080250 mm diame Solution