Abstract
In this study, experiments were conducted to explore some properties of the bubble plumes of two inclined circular plunging water jets on a water surface in a cubic aeration tank. A particle image velocimetry (PIV) system was used to measure the two-phase jet velocities in both the lateral and axial positions. Other parameters of interest, such as gas holdup (ε G), penetration depths (z p, m) and the height and width of the two-phase mixture due to the air entrainment, were also monitored. The value of bubble mean diameter (d b, m) under each operating condition was determined by using images captured by the PIV system. The results of the normalized axial velocity for the gas and water jets showed a good mixing effect in the aeration tank. The results obtained under different plunging angles (α) showed that as d o increases, z p also increases. Furthermore, under the same d o, z p at α= 75° was found to be higher than the ones obtained under other cases. The combination of two inclined jets yielded a higher z p compared to that yielded by one inclined jet. The value of ε G was found to decrease as d o increased for the same liquid flow rate.
| Original language | English |
|---|---|
| Pages (from-to) | 158-165 |
| Number of pages | 8 |
| Journal | International Journal of Multiphase Flow |
| Volume | 40 |
| DOIs | |
| Publication status | Published - Apr 2012 |
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Keywords
- Air entrainment
- Jets velocity
- Particle image velocimetry
- Plunging angles
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
- Mechanical Engineering
- Physics and Astronomy(all)
Cite this
Characterizing two inclined circular water jets plunging into an aeration tank. / Baawain, Mahad S.; Gamal El-Din, Mohamed; Smith, Daniel W.
In: International Journal of Multiphase Flow, Vol. 40, 04.2012, p. 158-165.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Characterizing two inclined circular water jets plunging into an aeration tank
AU - Baawain, Mahad S.
AU - Gamal El-Din, Mohamed
AU - Smith, Daniel W.
PY - 2012/4
Y1 - 2012/4
N2 - In this study, experiments were conducted to explore some properties of the bubble plumes of two inclined circular plunging water jets on a water surface in a cubic aeration tank. A particle image velocimetry (PIV) system was used to measure the two-phase jet velocities in both the lateral and axial positions. Other parameters of interest, such as gas holdup (ε G), penetration depths (z p, m) and the height and width of the two-phase mixture due to the air entrainment, were also monitored. The value of bubble mean diameter (d b, m) under each operating condition was determined by using images captured by the PIV system. The results of the normalized axial velocity for the gas and water jets showed a good mixing effect in the aeration tank. The results obtained under different plunging angles (α) showed that as d o increases, z p also increases. Furthermore, under the same d o, z p at α= 75° was found to be higher than the ones obtained under other cases. The combination of two inclined jets yielded a higher z p compared to that yielded by one inclined jet. The value of ε G was found to decrease as d o increased for the same liquid flow rate.
AB - In this study, experiments were conducted to explore some properties of the bubble plumes of two inclined circular plunging water jets on a water surface in a cubic aeration tank. A particle image velocimetry (PIV) system was used to measure the two-phase jet velocities in both the lateral and axial positions. Other parameters of interest, such as gas holdup (ε G), penetration depths (z p, m) and the height and width of the two-phase mixture due to the air entrainment, were also monitored. The value of bubble mean diameter (d b, m) under each operating condition was determined by using images captured by the PIV system. The results of the normalized axial velocity for the gas and water jets showed a good mixing effect in the aeration tank. The results obtained under different plunging angles (α) showed that as d o increases, z p also increases. Furthermore, under the same d o, z p at α= 75° was found to be higher than the ones obtained under other cases. The combination of two inclined jets yielded a higher z p compared to that yielded by one inclined jet. The value of ε G was found to decrease as d o increased for the same liquid flow rate.
KW - Air entrainment
KW - Jets velocity
KW - Particle image velocimetry
KW - Plunging angles
UR - http://www.scopus.com/inward/record.url?scp=84856081914&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84856081914&partnerID=8YFLogxK
U2 - 10.1016/j.ijmultiphaseflow.2011.10.012
DO - 10.1016/j.ijmultiphaseflow.2011.10.012
M3 - Article
VL - 40
SP - 158
EP - 165
JO - International Journal of Multiphase Flow
JF - International Journal of Multiphase Flow
SN - 0301-9322
ER -