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Fluid
Flow Table of Contents
The flow regime (either laminar or turbulent) is determined by
evaluating the Reynolds number of the flow
refer to (Flow Velocity profiles). The Reynolds
number, based on studies of Osborn
Reynolds, is a dimensionless number
comprised of the physical characteristics of the flow. Equation 3-7 is used
to calculate the Reynolds number (NR)
for fluid flow.
For practical purposes, if the Reynolds number is less than
2000, the flow is laminar. If it is greater
than 3500, the flow is turbulent. Flows with Reynolds numbers between 2000 and
3500 are sometimes referred to as
transitional flows. Most fluid systems in nuclear facilities operate with
turbulent flow. Reynolds numbers can be conveniently determined using a Moody
Chart; an example of which is shown in
figure B-1. Additional detail on the use of the Moody Chart is
provided in subsequent text.
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