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2015 Analysis of Water Hammer with Different Closing Valve Laws on Transient Flow of Hydrogen-Natural Gas Mixture
Norazlina Subani, Norsarahaida Amin
Abstr. Appl. Anal. 2015: 1-12 (2015). DOI: 10.1155/2015/510675

Abstract

Water hammer on transient flow of hydrogen-natural gas mixture in a horizontal pipeline is analysed to determine the relationship between pressure waves and different modes of closing and opening of valves. Four types of laws applicable to closing valve, namely, instantaneous, linear, concave, and convex laws, are considered. These closure laws describe the speed variation of the hydrogen-natural gas mixture as the valve is closing. The numerical solution is obtained using the reduced order modelling technique. The results show that changes in the pressure wave profile and amplitude depend on the type of closing laws, valve closure times, and the number of polygonal segments in the closing function. The pressure wave profile varies from square to triangular and trapezoidal shape depending on the type of closing laws, while the amplitude of pressure waves reduces as the closing time is reduced and the numbers of polygonal segments are increased. The instantaneous and convex closing laws give rise to minimum and maximum pressure, respectively.

Citation

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Norazlina Subani. Norsarahaida Amin. "Analysis of Water Hammer with Different Closing Valve Laws on Transient Flow of Hydrogen-Natural Gas Mixture." Abstr. Appl. Anal. 2015 1 - 12, 2015. https://doi.org/10.1155/2015/510675

Information

Published: 2015
First available in Project Euclid: 15 June 2015

zbMATH: 1351.76267
MathSciNet: MR3347320
Digital Object Identifier: 10.1155/2015/510675

Rights: Copyright © 2015 Hindawi

Vol.2015 • 2015
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