Jet-breaker dimensions effect on drop manhole energy dissipation

Document Type : Research Article

Authors

1 PhD Candidate, Hydraulics Structures, Department of Civil Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

2 Department of Civil Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

Abstract

Drop manholes are employed to dissipate energy in steep routes of sewer and drainage systems. The jet-breaker could be used to increase energy dissipation and hydraulic performance of them under Regime R2 and studying the effects of the jet-breaker length, width, sagitta, angle, as well as the inlet pipe filling ratio on drop energy dissipation were among the aims of this research. The modern statistical Design of Experiment (DoE) methodology and dimensional analysis were utilized to design the experiments according to the 2^5 full factorial design. Seventeen jet-breakers were examined and about 350 tests were performed. The statistical analysis of the results revealed that the response variable was significantly improved when the inlet pipe filling ratio was 80% and jet-breaker sagitta was equal to zero, and its angle was at 70˚. Also, effects of jet-breaker length and width ratios were insignificant. Moreover, The use of DoE resulted in straightforward data analysis and unbiased concluding.

Keywords

References

Camino, G.A., Zhu, D.Z. and Rajaratnam, N. (2011). Hydraulics of Stacked Drop Manholes. J. Irrig. Drain. Eng., 137, 537–52.
Camino, G.A., Zhu, D.Z., Rajaratnam, N. and Manas, S. (2009). Use of a Stacked Drop Manhole for Energy Dissipation: A Case Study in Edmonton, Alberta. Can. J. Civ. Eng., 36, 1037–50.
Carvalho, R.F. (2012). Hydraulic Characteristics of a Drop Square Manhole with a Downstream Control Gate. J. Irrig. Drain. Eng., 138, 569–76.
Chanson, H. (2004). Hydraulics of Rectangular Dropshafts. J. Irrig. Drain. Eng., 130, 523–29.
Christodoulou, G.C. (1991). Drop Manholes in Supercritical Pipelines. J. Irrig. Drain. Eng., 117, 37–47.
Gargano, R. and Hager, W.H. (2002). Supercritical Flow across Sewer Manholes. J. Hydraul. Eng., 128, 1014–17.
Granata, F., Marinis, G.de., Gargano, R. and Hager, W.H. (2011). Hydraulics of Circular Drop Manholes. J. Irrig. Drain. Eng., 137, 102–11.
Granata, F. (2016). Dropshaft Cascades in Urban Drainage Systems. Water Sci. Technol., 73, 2052–2059.
Granata, F., Marinis, G.de. and Gargano, R. (2014). Flow–Improving Element in Circular Drop Manholes. Journal of Hydraulic Research, 52, 347–55.
Hawkins, D. and Lye, L.M. (2006). Use of Doe Methodology for Investigating Conditions That Influence the Tension in Marine Risers for Fpso Ships. the First International Structural Specialty Conference, Calgary, Alberta, Canada.
Islam, M.F. and Lye, L.M. (2009). Combined Use of Dimensional Analysis and Modern Experimental Design Methodologies in Hydrodynamics Experiments. Ocean Eng., 36, 237–47.
Ma, Y., Zhu, D.Z., Rajaratnam, N. and Duin, B. (2017). Energy Dissipation in Circular Drop Manholes. J. Irrig. Drain. Eng., 143, 040170471–0401704710.
Montgomery D.C. (2013). Design and Analysis of Experiments. John Wiley & Sons Inc.
Myers R.H., Montgomery, D.C. and Anderson–Cook, C.M. (2009). Response surface methodology: process and product optimization using designed experiments. John Wiley & Sons.
Ryan T.P. (2007). Modern Experimental Design. John Wiley & Sons.
Sangsefidi, Y., Mehraein, M., Ghodsian, M. and Motalebizadeh, M.R. (2017). Evaluation and Analysis of Flow over Arced Weirs Using Traditional and Response Surface Methodologies. J. Hydraul. Eng., 143, 040170481–0401704811.
Szirtes, T. (2006). Applied Dimensional Analysis and Modeling. Elsevier.
Zheng, F., Li, Y., Zhao, J. and An, J. (2017). Energy Dissipation in Circular Drop Manholes under Different Outflow Conditions. Water, 9(10), 752.

Files

History

  • Receive Date: 12 May 2018
  • Revise Date: 20 March 2020
  • Accept Date: 05 April 2020

Share

How to cite

Statistics