Friction Factors for Small Diameter Plastic Pipes
- 1 February 1989
- journal article
- Published by American Society of Civil Engineers (ASCE) in Journal of Hydraulic Engineering
- Vol. 115 (2) , 183-192
- https://doi.org/10.1061/(asce)0733-9429(1989)115:2(183)
Abstract
Friction loss data were collected for three small diameter plastic pipe sections. Analysis of the data confirmed that the Blasius equation is a very accurate predictor of the friction factor when Reynolds numbers are less than 100,000. The theoretical basis for a power‐law relationship of the friction factor to Reynolds number is discussed, and the agreement of the l/7th power law with the Blasius exponent (-0.25) is pointed out. A combination of the Blasius and Colebrook‐White equations is proposed as a convenient and accurate head loss prediction equation. The combination equation is dimensionally homogeneous, correctable for viscosity changes, and accurate for small diameter plastic pipe as it is normally used.Keywords
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