9-17
IM 01F06A00-01E
9. GENERAL DESCRIPTION
■
Calculation formula
■
How to calculate volume flow rate at operating
conditions.
υ
D
2
• Qf = 3600
υ
S or Qf =
354
■
How to calculate the velocity of a Reynolds number.
•
υ
= 5
/ D (Reynolds number of 5000)
•
υ
= 20
/ D (Reynolds number of 20000)
•
υ
= 40
/ D (Reynolds number of 40000)
however
354
10
3
Qf
• Re = ········· (1)
D
•
=
10
3
················· (2)
ρ
f
Qf : Volume flow rate at operating conditions (m
3
/h)
D
: Inner diameter of YEWFLO (mm)
S
: Sectional area of YEWFLO(m
2
)
υ
: Flow velocity (m/s)
Re : Reynolds number (non unit)
ρ
f : Density at operating conditions (kg/m
3
)
: Viscosity at operating conditions (mPa·s (cP))
: Kinematic viscosity at operating conditions (10
-6
m
2
/s(cSt))
■
Typical fluid example
Table 9.5.4 Range of Measurable Water Flow Rate
(At standard condition of 15
°
C,
ρ
= 1000 kg/m
3
)
DYF Tab-14-b
Model Code
Range of Fixed
Accuracy Flow
Rate in m
3
/h
Measurable Flow Rate
in m
3
/h
DY015
DY025
DY040
DY050
DY080
DY100
DY150
DY200
DY250
DY300
DY025-/R1
DY040-/R1
DY050-/R1
DY080-/R1
DY100-/R1
DY150-/R1
DY200-/R1
—
—
—
DY040-/R2
DY050-/R2
DY080-/R2
DY100-/R2
DY150-/R2
DY200-/R2
—
—
—
—
0.30 up to 6
0.65 up to 18
1.3 up to 44
2.2 up to 73
4.3 up to 142
7.5 up to 248
17 up to 544
34 up to 973
60 up to 1506
86 up to 2156
0.94 up to 6
1.7 up to 18
2.6 up to 44
3.3 up to 73
4.6 up to 142
7.5 up to 248
18 up to 544
34 up to 973
60 up to 1506
86 up to 2156