Relationship between pressure drop in the drag-square region and roughness and fluid density
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When a fluid flows in the drag-square region, under constant other conditions, its pressure drop increases as the relative roughness of the pipe increases, and it decreases as the density of the fluid increases.
This post was last edited by ludinggi on 2013-5-29 at 15:47. According to the Fanning formula, the pipe friction loss is given by: Hf = ΔP/ρ = λ*(l/d)*(u²/2). In the regime of quadratic friction loss, λ depends only on the relative roughness ε/d. Therefore, the pressure drop increases as the relative roughness of the pipe increases, and it also increases as the density of the fluid increases. How did it turn into a smile with a hand over the mouth? Hf=pressure drop/density