Utilizing Modern Experimentation Method to Quantify Jet-Breaker Dimension Effects on Drop Manhole Pool Height
Drop manholes are commonly employed in sewer and drainage systems to reduce pipes slope. The operation of these structures is dominated by their flow regime. Poor hydraulic performance of them under Regime R2 was improved with the jet-breaker, which intersects the inlet jet; yet its proper dimensions were needed to be precisely determined. In this paper, effects of jet-breaker length, width, sagitta, and angle on drop manhole pool free-surface height were experimentally studied under 80% filling ratio of the inlet pipe. The modern statistical Design of Experiment (DoE) methodology and dimensional analysis were utilized to design the experiments in accordance with the 24-1IV fractional factorial design. Consequently, nine specific jet-breakers were built and examined at two different angles, and under various flow rates. The statistical analysis of the results shown that manhole pool height was significantly decreased when jet-breaker length, width, and sagitta were 1, 1.4, and 0.7 times the inlet pipe diameter, respectively, and its angle was at 70°. The use of DoE resulted in 21% reduction in experimental runs, cost, and time, while it provided comprehensive data analysis and objective conclusion.
Chanson, H. “Hydraulics of Rectangular Dropshafts.” Journal of Irrigation and Drainage Engineering 130, no. 6 (December 2004): 523–529. doi:10.1061/(asce)0733-9437(2004)130:6(523).
Granata, Francesco. “Dropshaft Cascades in Urban Drainage Systems.” Water Science and Technology 73, no. 9 (February 1, 2016): 2052–2059. doi:10.2166/wst.2016.051.
Granata, Francesco, Giovanni de Marinis, and Rudy Gargano. “Flow-Improving Elements in Circular Drop Manholes.” Journal of Hydraulic Research 52, no. 3 (April 14, 2014): 347–355. doi:10.1080/00221686.2013.879745.
Ma, Yiyi, David Z. Zhu, Nallamuthu Rajaratnam, and Bert van Duin. “Energy Dissipation in Circular Drop Manholes.” Journal of Irrigation and Drainage Engineering 143, no. 12 (December 2017): 04017047. doi:10.1061/(asce)ir.1943-4774.0001241.
Zheng, Feidong, Yun Li, Jianjun Zhao, and Jianfeng An. “Energy Dissipation in Circular Drop Manholes Under Different Outflow Conditions.” Water 9, no. 10 (September 30, 2017): 752. doi:10.3390/w9100752.
Granata, F., G. de Marinis, R. Gargano, and W. H. Hager. “Hydraulics of Circular Drop Manholes.” Journal of Irrigation and Drainage Engineering 137, no. 2 (February 2011): 102–111. doi:10.1061/(asce)ir.1943-4774.0000279.
De Marinis, G., Gargano, R., Granata, F., Hager, W. “Circular Drop Manholes: Preliminary Experimental Results.” Proceedings of the 32nd Congress of the International Association of Hydraulic Research (IAHR), Venice, Italy. IAHR, Madrid, Spain. 2007.
Camino, G. Adriana, David Z. Zhu, and Nallamuthu Rajaratnam. “Hydraulics of Stacked Drop Manholes.” Journal of Irrigation and Drainage Engineering 137, no. 8 (August 2011): 537–552. doi:10.1061/(asce)ir.1943-4774.0000327.
Granata, F., Gargano, R., De Marinis, G., Hager, W. “Choking Features of Drop Manholes in Sewer Systems.” Proceedings of the 1st European IAHR Congress, Edinburgh, UK, 2010.
Islam, Mohammed F., and L.M. Lye. “Combined Use of Dimensional Analysis and Modern Experimental Design Methodologies in Hydrodynamics Experiments.” Ocean Engineering 36, no. 3–4 (March 2009): 237–247. doi:10.1016/j.oceaneng.2008.11.004.
Sangsefidi, Yousef, Mojtaba Mehraein, Masoud Ghodsian, and Mohammad Reza Motalebizadeh. “Evaluation and Analysis of Flow over Arced Weirs Using Traditional and Response Surface Methodologies.” Journal of Hydraulic Engineering 143, no. 11 (November 2017): 04017048. doi:10.1061/(asce)hy.1943-7900.0001377.
Hager, Willi H. “Wastewater Hydraulics: Theory and Practice.” Springer, 2010.
Christodoulou, George C. “Drop Manholes in Supercritical Pipelines.” Journal of Irrigation and Drainage Engineering 117, no. 1 (January 1991): 37–47. doi:10.1061/(asce)0733-9437(1991)117:1(37).
Szirtes, Thomas. “Applied Dimensional Analysis and Modeling.” Elsevier, 2006.
Arao, Shinji, Tetsuya Kusuda, Katsumi Moriyama, Shunsuke Hiratsuka, Jyunsaku Asada, and Nozomu Hirose. “Energy Losses at Three-Way Circular Drop Manholes Under Surcharged Conditions.” Water Science and Technology 66, no. 1 (July 2012): 45–52. doi:10.2166/wst.2012.164.
Hawkins, D., and Leonard M. Lye. “Use of Doe Methodology for Investigating Conditions That Influence the Tension in Marine Risers for Fpso Ships.” First International Structural Specialty Conference. ha06: 2006.
Montgomery, Douglas C. “Design and Analysis of Experiments.” John Wiley & Sons, Inc., 2013.
Ryan, Thomas P. “Modern Experimental Design.” Wiley Series in Probability and Statistics (April 10, 2006). doi:10.1002/0470074353.
Myers, Raymond H., Douglas C. Montgomery, and Christine M. Anderson-Cook. “Response Surface Methodology: Process and Product Optimization Using Designed Experiments.” John Wiley & Sons, 2009.
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