IAHR, founded in 1935, is a worldwide independent memberbased organisation of engineers and water specialists working in fields related to the hydroenvironmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and ecohydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.





The wave speed of surge pressure under the interaction of vapour, water and steel pipes 
Author : 
Y. Kono , K. Kato , K. Ishikawa, A. Haga and Y. Shimoasa 
The equation of motion and the continuity equation are solved to analyse the pressure surge. The equation consists of the multiplication of wave speed in square and difference of velocity in pipeline. The wave speed of pressure surge is about 1300 m/s and the velocity in pipeline is from 1 m/s to 2 m/s for example in usual pipeline. The large scale of difference in speed from 500 times to 1000 times affects the sudden change of high pressure in the pressure surge equations. This is the reason that the study of wave speed of pressure surge is very important. The maximum wave speed in water is 1547 m/s and the maximum wave speed in steel is 5256 m/s according to the theory. The wave speed of vapourwater interaction decreases to 400 m/s at initial velocity 1.0 m/s. The wave speed in water, steel, and interaction of vapour, water and steel are measured precisely and the results of experiment are compared with the theoretical analysis.

File Size : 
546,240 bytes 
File Type : 
Adobe Acrobat Document 
Chapter : 
IAHR World Congress Proceedings

Category : 
34th Congress  Brisbane (2011)

Article : 
THEME 7: Hydroinformatics

Date Published : 
01/07/2011 







