CIVE 4307 Lecture Notes - Impeller, Water Hammer, Cavitation
3 Mar 2014
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Bouyancy: uplift force = weight of displaced fluid. Newtonian fluids: fluids having negligible yield stress (no str when static) and a constant viscosity. Uniform flow: no change in velocity with space (constant cross section) Ss flow: no change in velocity with time (constant discharge) Water considered incompressible, therefore cons. of mass becomes cons. of volume. F=m v= q v=pa e. g. fx=p1 a1x+p2 a 2x p3 a 3x= q vx. Wetted perimeter for fully flowing circular conduit, d=4r. H-w: v=kc r0. 63 s0. 54 where c: pipe characterstic, s: hf/l, k: (metric:0. 854, imperial:1. 318), r: hydr. For pipes between 50-1850 mm, and v<3 m/s. Nodes: continuity applies, unique energy, energy loss between nodes is independent of path. , adding pipes increases and h1=h1=h2 and ht=h1+h2+h3. Loops: clockwise is positive: simplify network by replacing pipes in parallel or series with equivalent pipes, calc r for each pipe. C h 1. 85 d4. 87 n=1. 85: assume flow distribution that satisfies continuity.
