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.
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided by research grants from the Canada Foundation for Innovation (CFI), Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grants, and Alberta Ingenuity Center for Water Research (AICWR), now known as the Alberta Water Research Institute (AWRI) which is a part of Alberta Innovates. The authors also appreciate the technical cooperation provided by the technical staff of the Environmental Engineering Program at the University of Alberta.
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
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U2 - 10.1016/j.ijmultiphaseflow.2011.10.012
DO - 10.1016/j.ijmultiphaseflow.2011.10.012
M3 - Article
AN - SCOPUS:84856081914
VL - 40
SP - 158
EP - 165
JO - International Journal of Multiphase Flow
JF - International Journal of Multiphase Flow
SN - 0301-9322
ER -