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6-2
IM 1F5B2-01E
Equation for determining the volumetric flowrate (Qf) of ULTRA YEWFLO under operating conditions:
Qf=
υ × D
2
354
where
Re = Reynolds number (dimensionless)
Qf = volumetric flow rate under operating conditions (m
3
/h)
D = inner diameter of ULTRA YEWFLO (mm)
ν = kinematic viscosity under operating conditions (cSt)
ρf = density under operating conditions (kg/m
3
)
µ = viscosity under operating conditions (cP)
υ = flow velocity (m/s)
If the obtained flow velocity falls within any of the ranges shown in Table 6.1, you
can measure the flowrate properly.
Using the graph in Figure 6.1, you can determine flow velocities for cases where the
Reynolds number is 5,000. Multiplying the given value by 4 gives you the flow
velocity for a Reynolds number of 20,000.
lanimoN
retemaiD
)mm(retemaiDrennI
1 mm51 5 8.21
mm524.32
mm046.63
mm055.74
mm080.17
mm0018.39
mm0518.831
mm0026.581
Kinematic Viscosity ν (cSt)
5
3
2
1
0.5
0.3
0.2
12351020 30 50 100 200 300
0.5
6
ν
D
v = 5 ×
D:YEWFLO inner diameter (mm)
25 mm
40
mm
50 mm
80 mm
100 mm
200 mm
150 mm
Minimum Flow Velocity v (ms)
15 mm
Figure 6.1 Relationship Between Minimum Flow Velocity and Kinematic
Viscosity (curves for a Reynolds number of 5,000)
39


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