Suggested Response - Q1

* Determine the relative roughness of a pipe with an internal diameter of 15 mm and an absolute roughness of 0.05 mm.

Response:

We know that the relative roughness is the ratio of absolute roughness to the pipe’s inside diameter:

R e l a t i v e space R o u g h n e s s space ϵ equals fraction numerator A b s o l u t e space R o u g h n e s s space e over denominator P i p e apostrophe s space I n s i d e space D i a m e t e r space d end fraction

R e l a t i v e space R o u g h n e s s space ϵ equals fraction numerator 0.05 over denominator 15 end fraction equals 0.0033

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