Experimental Investigation of Phase Distributions of Two-phase Air-silicone Oil Flow in a Vertical Pipe
This paper reports the results of an experimental study
conducted to characterise the gas-liquid multiphase flows
experienced within a vertical riser transporting a range of gas-liquid
flow rates. The scale experiments were performed using an
air/silicone oil mixture within a 6 m long riser. The superficial air
velocities studied ranged from 0.047 to 2.836 m/ s, whilst
maintaining a liquid superficial velocity at 0.047 m/ s. Measurements
of the mean cross-sectional and time average radial void fraction
were obtained using a wire mesh sensor (WMS). The data were
recorded at an acquisition frequency of 1000 Hz over an interval of
60 seconds. For the range of flow conditions studied, the average
void fraction was observed to vary between 0.1 and 0.9. An analysis
of the data collected concluded that the observed void fraction was
strongly affected by the superficial gas velocity, whereby the higher
the superficial gas velocity, the higher was the observed average void
fraction. The average void fraction distributions observed were in
good agreement with the results obtained by other researchers. When
the air-silicone oil flows were fully developed reasonably symmetric
profiles were observed, with the shape of the symmetry profile being
strongly dependent on the superficial gas velocity.
[1] Abdulkadir, M., Zhao, D., Sharaf, S., Abdulkareem, L.S., Lowndes, I.S.,
Azzopardi, B.J., 2010, Interrogating the effect of bends on gas-liquid
flow using advanced instrumentation, ICMF 2010, 7th International
Conference on Multiphase Flow, Tampa, FL, USA. (Accepted)
[2] Gardner, G. C., and Neller, P. H., 1969, Phase distributions flow of an
air-water mixture round bends and past obstructions, Proc. Inst. Mech.
Engr., Vol. 184, No. 3C, pp. 93 -101
[3] Ohnuki, A. and Akimoto, H. (1996), An experimental study on
developing air -water two-phase flow along a large vertical pipe: Effect
of air injection method, Int. J. Multiphase Flow, Vol. 22, No. 6, pp.
1143-1154.
[4] Ohnuki, A. and Akimoto, H. (2000), Experimental study on transition of
flow pattern and phase distribution in upward air-water two-phase flow
along a large vertical pipe, Int. J. Multiphase Flow, Vol. 26, No. 3, pp.
367-386.
[5] Shen, X., Mishima, K., and Nakamura, H. (2004), Two-phase
distribution in a vertical large diameter pipe, Int. J. Heat and Mass
Transfer, Vol. 48, pp. 211-225
[6] Azzopardi, B. J., Hernandez Perez, V., Kaji, R., Da Silva, M. J., Beyer,
M., and Hampel, U., 2008, Wire mesh sensor studies in a vertical pipe,
HEAT 2008, Fifth International Conference on Multiphase Systems,
Bialystok, Poland.
[7] Azzopardi, B. J., 1997, Drops in annular two-phase flow, International
Journal of Multiphase Flow, Vol. 23, pp. 1-53.
[8] Geraci, G., Azzopardi, B. J., and Van Maanen, H.R.E., 2007a,
Inclination effects on circumferential film distribution in annular gas/
liquid flows, AIChE Journal, Vol. 53, No.5, pp. 1144-1150.
[9] Geraci, G., Azzopardi, B. J., and Van Maanen, H.R.E., 2007b, Effects of
inclination on circumferential film thickness variation in annular gas/
liquid flows, Chemical Engineering Science, Vol. 62, No.11, pp. 3032-
3042.
[10] Hernandez-Perez, V., 2007, Gas-liquid two-phase flow in inclined pipes,
a PhD Thesis, University of Nottingham, United Kingdom
[11] Prasser, H.M., Krepper, E. and Lucas, D., Evolution of the two-phase
flow in a vertical tubeÔÇödecomposition of gas fraction profiles according
to bubble size classes using wire-mesh sensors, Int. J. Therm. Sci. 41
(2002) 17-28
[12] Carver, M. B., 1984, Numerical computation of phase separation in two
fluid flow, ASME Paper No. 82-FE-2, Vol. 106/ 153
[13] Carver, M.B., and Salcudean, M., 1986, Three-dimensional numerical
modelling of phase distribution of two - fluid flow in elbows and return
bends, Numerical Heat Transfer, Vol. 10, pp. 229-251
[14] Costigan, G., and Whalley, P. B., 1996, Slug flow regime identification
from dynamic void fraction measurements in vertical air-water flows.
Int. J. Multiphase Flow, Vol. 23, No. 2, pp. 263-282
[1] Abdulkadir, M., Zhao, D., Sharaf, S., Abdulkareem, L.S., Lowndes, I.S.,
Azzopardi, B.J., 2010, Interrogating the effect of bends on gas-liquid
flow using advanced instrumentation, ICMF 2010, 7th International
Conference on Multiphase Flow, Tampa, FL, USA. (Accepted)
[2] Gardner, G. C., and Neller, P. H., 1969, Phase distributions flow of an
air-water mixture round bends and past obstructions, Proc. Inst. Mech.
Engr., Vol. 184, No. 3C, pp. 93 -101
[3] Ohnuki, A. and Akimoto, H. (1996), An experimental study on
developing air -water two-phase flow along a large vertical pipe: Effect
of air injection method, Int. J. Multiphase Flow, Vol. 22, No. 6, pp.
1143-1154.
[4] Ohnuki, A. and Akimoto, H. (2000), Experimental study on transition of
flow pattern and phase distribution in upward air-water two-phase flow
along a large vertical pipe, Int. J. Multiphase Flow, Vol. 26, No. 3, pp.
367-386.
[5] Shen, X., Mishima, K., and Nakamura, H. (2004), Two-phase
distribution in a vertical large diameter pipe, Int. J. Heat and Mass
Transfer, Vol. 48, pp. 211-225
[6] Azzopardi, B. J., Hernandez Perez, V., Kaji, R., Da Silva, M. J., Beyer,
M., and Hampel, U., 2008, Wire mesh sensor studies in a vertical pipe,
HEAT 2008, Fifth International Conference on Multiphase Systems,
Bialystok, Poland.
[7] Azzopardi, B. J., 1997, Drops in annular two-phase flow, International
Journal of Multiphase Flow, Vol. 23, pp. 1-53.
[8] Geraci, G., Azzopardi, B. J., and Van Maanen, H.R.E., 2007a,
Inclination effects on circumferential film distribution in annular gas/
liquid flows, AIChE Journal, Vol. 53, No.5, pp. 1144-1150.
[9] Geraci, G., Azzopardi, B. J., and Van Maanen, H.R.E., 2007b, Effects of
inclination on circumferential film thickness variation in annular gas/
liquid flows, Chemical Engineering Science, Vol. 62, No.11, pp. 3032-
3042.
[10] Hernandez-Perez, V., 2007, Gas-liquid two-phase flow in inclined pipes,
a PhD Thesis, University of Nottingham, United Kingdom
[11] Prasser, H.M., Krepper, E. and Lucas, D., Evolution of the two-phase
flow in a vertical tubeÔÇödecomposition of gas fraction profiles according
to bubble size classes using wire-mesh sensors, Int. J. Therm. Sci. 41
(2002) 17-28
[12] Carver, M. B., 1984, Numerical computation of phase separation in two
fluid flow, ASME Paper No. 82-FE-2, Vol. 106/ 153
[13] Carver, M.B., and Salcudean, M., 1986, Three-dimensional numerical
modelling of phase distribution of two - fluid flow in elbows and return
bends, Numerical Heat Transfer, Vol. 10, pp. 229-251
[14] Costigan, G., and Whalley, P. B., 1996, Slug flow regime identification
from dynamic void fraction measurements in vertical air-water flows.
Int. J. Multiphase Flow, Vol. 23, No. 2, pp. 263-282
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:50785", author = "M. Abdulkadir and V. Hernandez-Perez and S. Sharaf and I. S. Lowndes and B. J. Azzopardi", title = "Experimental Investigation of Phase Distributions of Two-phase Air-silicone Oil Flow in a Vertical Pipe", abstract = "This paper reports the results of an experimental study
conducted to characterise the gas-liquid multiphase flows
experienced within a vertical riser transporting a range of gas-liquid
flow rates. The scale experiments were performed using an
air/silicone oil mixture within a 6 m long riser. The superficial air
velocities studied ranged from 0.047 to 2.836 m/ s, whilst
maintaining a liquid superficial velocity at 0.047 m/ s. Measurements
of the mean cross-sectional and time average radial void fraction
were obtained using a wire mesh sensor (WMS). The data were
recorded at an acquisition frequency of 1000 Hz over an interval of
60 seconds. For the range of flow conditions studied, the average
void fraction was observed to vary between 0.1 and 0.9. An analysis
of the data collected concluded that the observed void fraction was
strongly affected by the superficial gas velocity, whereby the higher
the superficial gas velocity, the higher was the observed average void
fraction. The average void fraction distributions observed were in
good agreement with the results obtained by other researchers. When
the air-silicone oil flows were fully developed reasonably symmetric
profiles were observed, with the shape of the symmetry profile being
strongly dependent on the superficial gas velocity.", keywords = "WMS, phase distribution, silicone-oil, riser", volume = "4", number = "1", pages = "10-8", }