Thus, we have obtained an expression to calculate
, major loss in the pipe because of viscous- effect.
Considering that, for turbulent flow the velocity or pressure–fields may not be exactly (analytically) represented, one resorts to dimensional analysis.
(Fig. 23b)
The experimental observations suggest that pressure drop in a pipe–flow under turbulent conditions depends on Reynolds number and surface roughness.
, major loss in the pipe because of viscous- effect. 
