1.1 Moody Chart
The following characteristics are observed from the data of (3). For laminar flow, Re < 2300, f =
64/Re, which is independent of relative roughness. For very large Reynolds numbers, f =j(e /D)
which is independent of the Reynolds number. For such flows, commonly termed completely
turbulent flow, along the wall pipe, exists the laminar sublayer so thin that the surface roughness
completely dominates the character of the flow near the wall. The gap in the figure for which no
values of f are given, 2100 < Re < 4000, is a result of the fact that the flow in this transition range