ENGG 2230 Lecture Notes - Lecture 14: Plat, Boundary Layer Thickness, Hydraulic Head

• School: University of Guelph
• Department: Engineering
• Course: ENGG 2230
• Professor: Bill Van Heyst

Document Summary

Flow rates in the pipes are the same: q1 = q2 = q3. The input flow rate is the same as the output flow rate. Head loss through the system equals the sum of the head loss through each pipe: (cid:1848)(cid:2869)(cid:1856)(cid:2869)(cid:2870)=(cid:1848)(cid:2870)(cid:1856)(cid:2870)(cid:2870)=(cid:1848)(cid:2869)(cid:1856)(cid:2871)(cid:2870, (cid:3002)(cid:3003)= (cid:2869)+ (cid:2870)+ (cid:2871) Guess a(cid:374) (cid:858)f(cid:859) sol(cid:448)e the e(cid:395)uatio(cid:374) the(cid:374) use the solutio(cid:374) to (cid:374)a(cid:396)(cid:396)o(cid:449) do(cid:449)(cid:374) the (cid:858)f(cid:859) (cid:448)alue. Occurs when the flow rate is unknown but the total head loss is known: the head loss for each pipe is equal. Net flow into a junction is zero. The net pressure change around a closed loop is zero. The pressure changes must satisfy the moody and minor loss correlations. Flow near a boundary is affected by viscous effects. The boundary layer thi(cid:272)k(cid:374)ess is (cid:858) (cid:859: (cid:3051)= (cid:2873)(cid:3019)(cid:3032)(cid:3117)(cid:3118, (cid:3051)=(cid:2868). (cid:2869)(cid:2874)(cid:3019)(cid:3032)(cid:3117)(cid:3118, when flow is laminar (103 < re < 106, when flow is turbulent (re > 106) Can estimate the drag by using the equation.