Calculation Of Velocity Gradient (G) - Aqualytic AL40 Mode D'emploi

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
28
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_AL40_AL50_5 04/2014
(N*s*m -2 )
(kg*m )
-3
(m )
3
(°C)
(min )
-1
(s )
-1
(m)
200 250