The friction factor relates six parameters of the flow:
Therefore, given any five of these, we can use the friction-factor charts to find the sixth.
Most often, instead of being interested in the average velocity, we are interested in the volumetric flow rate Q = (p/4)D^{2}V
The three most common types of problems are the following:
Type |
Given |
To find |
1 |
D, k, r, m, Q |
h_{f} |
2 |
D, k, r, m, h_{f} |
Q |
3 |
k, r, m, h_{f}, Q |
D |
Generally, type 1 can be solved directly, where as types 2 and 3 require simple trial and error.
Three fundamental problems which are commonly encountered in pipe-flow calculations: Constants: r, m, g, LLast Modified on: 14-Sep-2014
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