Effect of Wall Roughness and Flow Velocity on Water Hammer

Abstract:

Water hammer can occur in any fluid pipeline systems. The pressure caused by water hammer are far exceeding the pressure range of the pipe limit, and it can lead to the failure or fracture of the pipeline. Since a great loss has been caused by that, two influence factors (flow velocity and roughness of the pipe-wall) associated with water hammer have been performed by using the numerical simulation software CFX. Analysis of the results show that each factor effects differently in waveform, amplitude, period, attenuation of the water hammer wave. The different velocities only influences the peak of pressure wave but not the waveform and period. The pressure reduction as the increase of roughness can be neglected compared to the normal pressure.

• Periodical: Advanced Materials Research (Volume 1014)
• Pages: 185-191
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1014.185
• Online since: July 2014
• Authors: Qing Zheng Meng, Cheng Yang, Li Sheng Liu*, Zhen Wang
• Keywords: CFX, Influence Factor, Pipeline, Water Hammer

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[2] Yang Cheng L LL Q. Simulation Analysis of Water Hammer In Water Pipe Based On CFX[J]. sciencepaper online. (2013).

[3] Wikipedia. water hammer[Z]. 2014: 2014, cause and effect of water hammer , expression and dynamic equations.

[4] Munson B R. Fundamentals of Fluid Mechanics 5th Edition [Z]. John Wiley & Sons Australia, Limited, (2005).

[5] Bergant A, Simpson A R, Engineering U O A D. Water Hammer and Column Separation Measurements in an Experimental Apparatus[Z]. University of Adelaide, Department of Civil and Environmental Engineering, (1995).

[6] A. Bergant, A. Ross Simpson, J. Vìtkovsk. Developments in unsteady pipe flow friction modelling[J]. Journal of Hydraulic Research, 2001, 39(3): 249-257.

DOI: 10.1080/00221680109499828

[7] A. Bergant, A.S. Tijsseling, J. Vítkovský, et al. Further Investigation of Parameters Affecting Water Hammer Wave Attenuation, Shape and Timing: Part 1: Mathematical Tools: Report on Applied and Numerical Analysis[M]. Department of mathematics and computer science, University of technology, (2003).

DOI: 10.3826/jhr.2008.2848

[8] A. Bergant, A.S. Tijsseling, J.P. Vítkovský, et al. Parameters affecting water-hammer wave attenuation, shape and timing—Part 1: Mathematical tools[J]. Journal of Hydraulic Research, 2008, 46(3): 373-381.

DOI: 10.3826/jhr.2008.2848