Working Guide to Process Equipment, Third Edition
By Norman P. Lieberman

40.5: Special Case for Laminar Flow

40.5 Special Case for Laminar Flow

You will have noticed that there is just one line on the friction factor chart (Fig. 40.6) for ? in terms of Re in the laminar flow region (Re less than 2 10 3) 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

()

where l

= Length of pipe, ft

ID

= Internal diameter of pipe, ft

D

= Density of fluid, lb/ft 3

V

= Linear velocity, ft/s

? P f

= Frictional pressure loss, poundal/ft 2 (or lb (mass) ft -1 s -2) [1 poundal = 1/(32.2 144) psi]

Copyright The McGraw-Hill Companies, Inc. 2008 under license agreement with Books24x7
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