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The friction factor used in the Darcy-Weisbach equation to calculate the pressure drop in pipe flows is dependent on the surface roughness inside the pipe and Reynolds number of the pipe flow. The relationship between the friction factor and the relative roughness, Reynolds number can be found in the Moody diagram.

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The friction factor used in the Darcy-Weisbach equation to calculate the pressure drop in pipe flows is dependent on the surface roughness inside the pipe and Reynolds number of the pipe flow. The relationship between the friction factor and the relative roughness, Reynolds number can be found in the Moody diagram.

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for turbulent flow in pipes the friction factor depends on Reynold's number as well as the inside roughness of the material.



you could calculate the pipe inside roughness or the relative roughness by referring to the 'values of absolute roughness table'.



relative roughness =ε/D


where,
ε- absolute roughness.
D- inside diameter of the pipe.


for stainless steel the the absolute roughness value is 0.0018inches or 0.000045metre.

you could substitute the value in the above formula and find out the relative roughnes.


After doing this refer the Moody diagram to find out the friction factor for the values of Reynold's number and relative roughness.


















ε

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Friction Interaction is a push or pull factor of your object rubbing against the ground.

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Yes. Friction is always a factor. It is partly through drag, which can be thought of as friction, that the wind in a tornado is able to cause damage.

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  • limiting friction is force of friction when a body slides over the surface of another body
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