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Calculation of velocity gradient (G)
GB
Formula
Velocity gradient (s
-1
)
Power requirement (W)
Notes
Dynamic viscosity:
Mass density of fluid:
Water volume:
Liquid mixed
Measurement temperature:
Constant
Number of turns / minute (RPM)
Number of turns / second
Diameter of impeller
Example: Velocity gradient for turbulent flow
Data
Number of turns / min-1
200
150
100
75
50
40
30
Graph
600
500
400
300
200
100
0
0
20
G=√(P/μV)
P = k*p*n
P = k*μ*n
μ
p
V
Water
20
k
n
n
D
G (turbulent) / s
544,28
353,52
192,43
124,99
68,03
48,68
31,62
50
100
mixer speed / rpm
*D
turbulent
3
5
*D
laminar
2
3
0,001002
998,2
0,001
3,38
from 30 to 200
(from 30 to 200)*1/60
0,075
-1
150
Floc-Tester_ET730_5 07/2016
(N*s*m
-2
)
(kg*m
)
-3
(m
)
3
(°C)
(min
)
-1
(s
)
-1
(m)
200
250
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