FLOWLAB SOLUTION
8.143 Using the same FlowLab template as in Problem 8.142, investigate the effects of
the diameter ratio on the discharge coefficient for a flat plate type orifice meter. Using a
pipe with a radius of 0.1 m, conduct simulations for diameter ratios (DR) of 0.3, 0.5, and
0.7. Use the default water for the “Materials” and maintain a Reynolds number of Re
D
=
10,000 (based on pipe diameter). Note that the Reynolds number calculated in this
template is based on the diameter of the orifice opening, or Re
d
.
Create a “Fine” mesh for
the grid and use a convergence criterion of 1x10
4
. Record the discharge coefficient
values for each diameter ratio from the “Reports” section and create a graph of discharge
coefficient as a function of diameter ratio. Compare your results to data provided in this
chapter in Figure 8.41 (also based on Re
D
).
Problem Setup
The pipe radius, diameter ratio, and orifice configuration are set in the Geometry window
as shown below. All cases used a pipe radius of 0.1 m, and a flat plate type orifice meter.
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 Spring '08
 all
 Fluid Dynamics, 0.1 m, diameter ratio

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