This friction factor is one-fourth of the Darcy friction factor, so attention must be paid to note which one of these is meant in the " friction factor " chart or equation consulted.
42.
Atkinson friction factor is represented by the symbol k and has the same units as air density ( kilograms per cubic metre in SI units, lbfmin ^ 2 / ft ^ 4 in Imperial units ).
43.
The Darcy friction factor is also known as the " Darcy Weisbach friction factor ", " resistance coefficient " or simply " friction factor "; by definition it is four times larger than the Fanning friction factor.
44.
The Darcy friction factor is also known as the " Darcy Weisbach friction factor ", " resistance coefficient " or simply " friction factor "; by definition it is four times larger than the Fanning friction factor.
45.
The Darcy friction factor is also known as the " Darcy Weisbach friction factor ", " resistance coefficient " or simply " friction factor "; by definition it is four times larger than the Fanning friction factor.
46.
The Darcy Weisbach Formula f _ D is 4 times the Fanning friction factor f and so a factor of \ frac { 1 } { 4 } has been applied to produce the formula given below.
47.
Once the friction factors of the pipes are obtained ( or calculated from pipe friction laws such as the Darcy-Weisbach equation ), we can consider how to calculate the flow rates and head losses on the network.
48.
The Darcy friction factor is also known as the " Darcy Weisbach friction factor ", " resistance coefficient " or simply " friction factor "; by definition it is four times larger than the Fanning friction factor.
49.
The chart plots Darcy Weisbach friction factor against Reynolds number Re for a variety of relative roughnesses, the ratio of the mean height of roughness of the pipe to the pipe diameter or ? / " D ".
50.
The friction factor is not a constant : it depends on such things as the characteristics of the pipe ( diameter and roughness height ), the characteristics of the fluid ( its kinematic viscosity [ nu ] ), and the velocity of the fluid flow.
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