Special Case for Laminar Flow

You will have noticed that there is just one line on the friction factor chart (Fig. 48.6) for ) in terms of Re in the laminar flow region (Re less than 2 x 10 ) of slope ) = 8/Re. This means that for Reynolds numbers of less than 2000 we can very simply calculate the frictional pressure loss by the relationship 

ID = Internal diameter of pipe, ft D = Density of fluid, lb/fft V = Linear velocity, ft/s 

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