Physics 34.1 Bernoulli's Equation & Flow in Pipes (6 of 38) The Moody Diagram

In this video I will explain the Moody Diagram, which is used to find the friction factor=f=? in the frictional head loss equation when we have turbulent flow which is dependent on the Reynold's number and the relative roughness of the pipe.

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[craig]

We’re unable to calculate velocity for Reynolds number because our velocity equation, derived from Bernoulli’s equation, includes major and minor losses and requires the friction factor, lambda. Without velocity, we can’t calculate Reynolds number, which we need to find lambda. Given that I know k/D, is there another way to determine Reynolds number so we can solve for lambda?

[mrasare]

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[gopinathsuresh]

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[InvictusForever]

But what happens if the reynold's number and relative roughness intersect at a point below the lines? Like when reynold's number is 10^5 and relative roughness is 0.0001 in the diagram. How to find f then?

[amnabibi]

We we don't have Reynolds no. can we find 'f' by roughness directly by drawing straight line from roughness value