XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2799
pressure measurements, the measured fluctuating voltage
signals would be proportional to fluid velocity fluctuation
as indicated by Bakker et al. (2009).
Our team, Meng et al. (2014a), used a 60L flotation
cell to perform PVS measurement as shown in Figure 8.
The measurements were taken along the vertical and hori-
zontal axis under different impeller speeds. The results were
validated against LDA measurement results in the same flo-
tation cell, as shown in Figure 9. When compared the PVS
results agreed with the LDA results. The research showed
that fluctuating voltage signals caused by pressure could
also be converted to kinetic energy fluctuation. Meng et
al. (2014b) also indicated that the kinetic energy fluctua-
tions should be proportional to turbulent kinetic energy
(TKE) in the fluid. Therefore, the piezoelectric vibration
sensor measurement results can be used to interpret TKE
in the liquid.
Meng et al. (2014b) tested PVS in a Metso 300 m3
RCS industrial flotation cell, showing that the turbulence
profile measured by the sensor varied with hydrodynamic
conditions in an expected way. In their subsequent research,
Meng et al. (2015) applied the piezoelectric vibration sen-
sor in two 3 m3 flotation cells to measure turbulence dis-
tribution and to establish mathematical models to predict
turbulence distribution from flotation cell operational
parameters. The models can predict turbulence zone vol-
umes with good accuracy. This work has demonstrated that
(a)
0
20
40
60
80
100
120
140
160
0 10 20 30 40 50 60
Turbulent Kineg415c Energy Dissipag415on Rate (m2/s3)
5 L Cell, 1024 RPM, Plane E
24
35
47
68
100 mm 1
RD 100%
6 mmmm
RD 68%
4 mmmm
RD 47%
3 mmmm
RD 35%
2 mmmm
RD 24%
(b)
0
50
100
150
200
250
300
350
0 10 20 30 40 50 60
Turbulent Kineg415c Energy Dissipag415on Rate (m2/s3)
60 L Cell, 550 RPM, Plane E
50
74
99
144 mm
211 mm 2
RD 100%
1
RD 68%
9 mmmm
RD 47%
7 mmmm
RD 35%
5 mmmm
RD 24%
Figure 7. Turbulent kinetic energy dissipation rate values on plane E (east direction) at different
heights in 5 L (a) and 60 L (b) (error bars indicate the 97.7% confidence interval)
Height(mm)
Height(mm)
pressure measurements, the measured fluctuating voltage
signals would be proportional to fluid velocity fluctuation
as indicated by Bakker et al. (2009).
Our team, Meng et al. (2014a), used a 60L flotation
cell to perform PVS measurement as shown in Figure 8.
The measurements were taken along the vertical and hori-
zontal axis under different impeller speeds. The results were
validated against LDA measurement results in the same flo-
tation cell, as shown in Figure 9. When compared the PVS
results agreed with the LDA results. The research showed
that fluctuating voltage signals caused by pressure could
also be converted to kinetic energy fluctuation. Meng et
al. (2014b) also indicated that the kinetic energy fluctua-
tions should be proportional to turbulent kinetic energy
(TKE) in the fluid. Therefore, the piezoelectric vibration
sensor measurement results can be used to interpret TKE
in the liquid.
Meng et al. (2014b) tested PVS in a Metso 300 m3
RCS industrial flotation cell, showing that the turbulence
profile measured by the sensor varied with hydrodynamic
conditions in an expected way. In their subsequent research,
Meng et al. (2015) applied the piezoelectric vibration sen-
sor in two 3 m3 flotation cells to measure turbulence dis-
tribution and to establish mathematical models to predict
turbulence distribution from flotation cell operational
parameters. The models can predict turbulence zone vol-
umes with good accuracy. This work has demonstrated that
(a)
0
20
40
60
80
100
120
140
160
0 10 20 30 40 50 60
Turbulent Kineg415c Energy Dissipag415on Rate (m2/s3)
5 L Cell, 1024 RPM, Plane E
24
35
47
68
100 mm 1
RD 100%
6 mmmm
RD 68%
4 mmmm
RD 47%
3 mmmm
RD 35%
2 mmmm
RD 24%
(b)
0
50
100
150
200
250
300
350
0 10 20 30 40 50 60
Turbulent Kineg415c Energy Dissipag415on Rate (m2/s3)
60 L Cell, 550 RPM, Plane E
50
74
99
144 mm
211 mm 2
RD 100%
1
RD 68%
9 mmmm
RD 47%
7 mmmm
RD 35%
5 mmmm
RD 24%
Figure 7. Turbulent kinetic energy dissipation rate values on plane E (east direction) at different
heights in 5 L (a) and 60 L (b) (error bars indicate the 97.7% confidence interval)
Height(mm)
Height(mm)