Chemical Engineering - Fluid Mechanics - Discussion
Discussion Forum : Fluid Mechanics - Section 6 (Q.No. 37)
37.
Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement.
Discussion:
3 comments Page 1 of 1.
Kamal said:
3 years ago
Rough pipes always have high frictional rate than smooth, so the answer is valid.
Shankar said:
3 years ago
@Nandini.
Your statement is only valid for hydraulically smooth pipe where f only fn of Re, but here they have mentioned another one is a rough pipe, so here it depends on Re & relative roughness.
Your statement is only valid for hydraulically smooth pipe where f only fn of Re, but here they have mentioned another one is a rough pipe, so here it depends on Re & relative roughness.
Nandini said:
5 years ago
I think the answer is A because friction factor depends only on Reynolds no. Here, in this case, the velocity is the same fluid is same so density and viscosity same and dia of the two pipes are same so no change in the Reynolds no. So same friction factor. Correct me if I am wrong.
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