10
Floc-Tester_AL30_4 07/2014
DE
Berechnung des Geschwindigkeitsgradienten (G)
Formel
Geschwindigkeitsgradient (l/s)
G=
√
(P/μV)
Leistungsbedarf (W)
P = k .p .n
3
.D
5
turbulent
P = k .μ .n
2
.D
3
laminar
Anmerkungen
Dynamische Viskosität
μ
0,001002
(N .s/m
2
)
Massendichte des Fluids
p
998,2
(kg/m
3
)
Wasservolumen
V
0,001 (m
3
)
Flüssigkeit gemischt:
Wasser
Messtemperatur:
20
(°C)
Konstante
k 3,38
Umdrehungen / Sekunde
n
von 30 bis 200 (min
-1
)
Durchmesser des Laufrades
D
0,075
(m)
Daten
min
-1
G (turbulent)
200 175,0573
150 113,7031
100 61,8921
75 40,2001
50 21,88216
40 15,6576
30 10,16991
Graph
G vs RPM
0
20
40
60
80
100
120
140
160
180
200
0
50
100
150
200
250
mixer speed rpm
vel
oci
ty g
ra
di
en
t G
(s-
1)
CALCULATION OF VELOCITY GRADIENT (G)
FOR FLOCCULATORS
FORMULA:
Velocity gradient (l/s)
G=√(P/µV)
Power requirement (W)
P = k.ρ.n
3
.D
5
turbulant
P = k.µ.n
2
.D
3
laminer
NOTES:
Dynamic
viscosity
µ 0.001002 (N.s/m2)
Mass density of fluid
ρ 998,2
(kg/m3)
Water
volume
V 0.001
(m3)
Liquid
mixed:
Water
Measurement temperature:
20
(°C)
Constant k 3.38
revs / sec
n
from 30 to 200
(rpm)
Diameter
of
impeller
D
0.075
(m)
DATA:
RPM Turbulent
G
200 175,0573
150 113,7031
100 61,8921
75 40,2001
50 21,88216
40 15,6576
30 10,16991
GRAPH:
Rührerdrehzahl min
-1
Geschwindigkeitsgradienten G (s-1)
Summary of Contents for AL30
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