Abstract
Entrapped air pockets reduce flood conveying capacity of a surcharged drainage tunnel, and could be released explosively as geysers from vertical dropshafts. Nevertheless, the impact of dropshaft inflow on air pocket expulsion has hitherto not been fully understood. In this work, experiments was performed on a simplified drainage system consisting of a dropshaft with inflow. An air pocket was introduced into the tunnel; its dynamics in the dropshaft was measured with a high speed camera and pressure transducers. A heuristic analysis on the kinematics of the air pocket showed that when the dropshaft inflow is greater than a critical flow dependent on the dropshaft diameter, the increased compression leads to stronger air pocket expulsion, as spewing and/or ejection of air-water mixture. Observed occurrence of the phenomena generally agrees with the prediction.
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Data Availability Statement
All data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research is supported by the Faculty Initiation Grant (IGN17EG05) and a support grant from the Undergraduate Research Opportunities Program (UROP) of The Hong Kong University of Science and Technology. The assistance on the experiments and image analysis by undergraduate students L. S. Wong and C. H. Chiu is gratefully acknowledged.
References
Black and Veatch Hong Kong. 2009. Study of water gushing phenomenon in Plover cove stage I tunnel. Hong Kong: Black and Veatch Hong Kong Ltd.
Camino, G. A., D. Z. Zhu, and N. Rajaratnam. 2015. “Flow observations in tall plunging flow dropshafts.” J. Hydraul. Eng. 141 (1): 06014020. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000939.
Chan, S. N., and C. H. Chiu. 2021. “Flow regimes of a surcharged plunging dropshaft-tunnel system.” J. Irrig. Drain. Eng. 147 (10): 04021045. https://doi.org/10.1061/(ASCE)IR.1943-4774.0001603.
Chan, S. N., J. Cong, and J. H. W. Lee. 2018. “3D numerical modeling of geyser formation by release of entrapped air from horizontal pipe into vertical shaft.” J. Hydraul. Eng. 144 (3): 04017071. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001416.
Chosie, C. D., T. M. Hatcher, and J. G. Vasconcelos. 2014. “Experimental and numerical investigation on the motion of discrete air pockets in pressurized water flows.” J. Hydraul. Eng. 140 (8): 04014038. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000898.
Cong, J., S. N. Chan, and J. H. W. Lee. 2017. “Geyser formation by release of entrapped air from horizontal pipe into vertical shaft.” J. Hydraul. Eng. 143 (9): 04017039. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001332.
Davies, R. M., and G. I. Taylor. 1950. “The mechanics of large bubbles rising through extended liquids and through liquids in tubes.” Proc. R. Soc. London, Ser. A 200 (1062): 375–390. https://doi.org/10.1098/rspa.1950.0023.
Eldayih, Y., M. Cetin, and J. G. Vasconcelos. 2020. “Air-pocket entrapment caused by shear flow instabilities in rapid-filling pipes.” J. Hydraul. Eng. 146 (4): 04020016. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001711.
Konrad, C. P. 2003. “Effects of urban development on floods, US Geological Survey fact sheet FS-076-03.” Accessed April 18, 2022. https://pubs.usgs.gov/fs/fs07603/pdf/fs07603.pdf.
Liu, L., W. Shao, and D. Z. Zhu. 2020. “Experimental study on stormwater geyser in a vertical shaft above a junction chamber.” J. Hydraul. Eng. 146 (2): 04019055. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001660.
Muller, K. Z., J. Wang, and J. G. Vasconcelos. 2017. “Water displacement in shafts and geysering created by uncontrolled air pocket releases.” J. Hydraul. Eng. 143 (10): 04017043. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001362.
Nicklin, D. J., J. O. Wilkes, and J. F. Davidson. 1962. “Two-phase flow in vertical tubes.” Trans. Inst. Chem. Eng. 40 (1): 61–67.
Qian, Y., D. Z. Zhu, L. Liu, W. Shao, S. Edwini-Bonsu, and F. Zhou. 2020. “Numerical and experimental study on mitigation of storm geysers in Edmonton, Alberta, Canada.” J. Hydraul. Eng. 146 (3): 04019069. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001684.
Rajaratnam, N., A. Mainali, and C. Y. Hsung. 1997. “Observations on flow in vertical dropshafts in urban drainage systems.” J. Environ. Eng. 123 (5): 486–491. https://doi.org/10.1061/(ASCE)0733-9372(1997)123:5(486).
Schulz, H. E., J. G. Vasconcelos, and A. C. Patrick. 2020. “Air entrainment in pipe-filling bores and pressurization interfaces.” J. Hydraul. Eng. 146 (2): 04019053. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001672.
Vasconcelos, J. G., and S. J. Wright. 2011. “Geysering generated by large air pockets released through water-filled ventilation shafts.” J. Hydraul. Eng. 137 (5): 543–555. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000332.
Vasconcelos, J. G., and S. J. Wright. 2017. “Anticipating transient problems during the rapid filling of deep stormwater storage tunnel systems.” J. Hydraul. Eng. 143 (3): 06016025. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001250.
Viparelli, M. 1961. “Air and water currents in vertical shafts.” Houille Blanche 47 (6): 857–869. https://doi.org/10.1051/lhb/1961053.
Wallis, G. B. 1969. One-dimensional two-phase flow. New York: McGraw-Hill.
Wang, J., and J. G. Vasconcelos. 2020. “Investigation of manhole cover displacement during rapid filling of stormwater systems.” J. Hydraul. Eng. 146 (4): 04020022. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001726.
Whillock, A. F., and M. F. C. Thorn. 1973. Air entrainment in dropshafts. London: Construction Industry Research and Information Association.
Wright, S. J., J. W. Lewis, and J. G. Vasconcelos. 2011. “Physical processes resulting in geysers in rapidly filling storm-water tunnels.” J. Irrig. Drain. Eng. 137 (3): 199–202. https://doi.org/10.1061/(ASCE)IR.1943-4774.0000176.
Zhou, F., F. Hicks, and P. M. Steffler. 2002. “Observations of air-water interaction in a rapidly filling horizontal pipe.” J. Hydraul. Eng. 128 (6): 635–639. https://doi.org/10.1061/(ASCE)0733-9429(2002)128:6(635).
Zhou, L., Y. Cao, B. Karney, B. Bergant, A. S. Tijsseling, D. Liu, and P. Wang. 2020. “Expulsion of entrapped air in a rapidly filling horizontal pipe.” J. Hydraul. Eng. 146 (7): 04020047. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001773.
Zhou, L., H. Wang, B. Karney, D. Liu, P. Wang, and S. Guo. 2018. “Dynamic behavior of entrapped air pocket in a water filling pipeline.” J. Hydraul. Eng. 144 (8): 04018045. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001491.
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© 2022 American Society of Civil Engineers.
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Received: Aug 2, 2021
Accepted: Nov 3, 2022
Published online: Dec 23, 2022
Published in print: Mar 1, 2023
Discussion open until: May 23, 2023
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