Transient Friction in Pressurized Pipes. III: Investigation of the EIT Model Based on Position-Dependent Coefficient Approach in MIAB Model
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Hydraulic Engineering
Volume 137, Issue 9
Abstract
Recently, the modified instantaneous acceleration-based (MIAB) model has been improved by the authors by using position-dependent coefficients found from investigation of the convolution-based (CB) model. Although this improvement is not proven general by any means, the fit with experimental results is very good. The three existing classes of one-dimensional models for the water-hammer transient that are applicable from an engineering point of view are the two models mentioned previously and the extended irreversible thermodynamics (EIT) model, which uses a coefficient found from thermodynamical considerations. This paper seeks the equivalent coefficients for the EIT model corresponding to the position-dependent coefficient the MIAB model to investigate the implications to the EIT model by using these coefficients. This is interesting because the EIT model is based on physical considerations using irreversible thermodynamics, and conclusions can possibly be drawn from this approach. The EIT coefficients found based on the position-dependent coefficients are used in simulations, and the results show an improvement compared to classical constant-coefficient EIT simulations. Based on this and discussion of water-hammer transient phenomena, it is suggested that limitations in the original EIT model regarding the coefficients might not be just and may be a possible limitation to the EIT model’s performance.
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Acknowledgments
The authors would like to thank Dr. Anton Bergant for providing access to and permission to use the experimental data from the test performed at University of Adelaide.
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© 2011 American Society of Civil Engineers.
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Received: Jan 22, 2010
Accepted: Feb 4, 2011
Published online: Feb 8, 2011
Published in print: Sep 1, 2011
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