Operation Manual

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)