Authors : Anwar Hussain; Sandip Ghosh

Volume/Issue : Volume 10 - 2025, Issue 6 - June

Google Scholar : https://tinyurl.com/f5dypytn

DOI : https://doi.org/10.38124/ijisrt/25jun1623

Note : A published paper may take 4-5 working days from the publication date to appear in PlumX Metrics, Semantic Scholar, and ResearchGate.

Abstract : Leak flow prediction has become a part and parcel of safe design in high pressure high temperature piping systems. This study investigates the behavior of mass flux, flow velocity and phasic transformation through circumferential cracks with circular and rectangular geometries from high-pressure high temperature pipelines. 3- dimensional computational hydrodynamic simulations were performed to model narrow leaks simulating the conditions of a pressurized water reactor. The simulations examined variations in mass flux and velocity for different crack sizes under a stagnation pressure range of 70 to 100 bar. Results demonstrate that both mass flux and velocity consistently increase with pressure. For circular cracks, mass flux increased by up to 20.2%, while average velocity rose by 20%. In smaller cracks, the increases in mass flux and velocity were around 19.8%. Rectangular cracks exhibited similar trends, with mass flux increasing by up to 19.6% and velocity by 19.7%. These findings demonstrate the strong dependence of leakage behavior on both pressure and crack geometry, which is critical for predicting failure risks in high-pressure systems.

Keywords : Leak, Pipe, Crack, High pressure High temperature, Multiphase.

References :

1. Amos C. N. and Schrock V. E., Critical discharge of initially subcooled water through slits, USNRC;. NUREG-CRe3475 (1983).
2. Ali J. A. and Ahmed P., Flow characteristics around the crack in pipeline, J. Phys.: Conf. Ser., vol. 2594, 012023, (2023)..
3. Ali S., Hawwa M.A., and Baroudi U., Effect of Leak Geometry on Water Characteristics Inside Pipes, Sustainability 14, 5224. (2022)
4. De Sousa C. A. and Romero O. J., Influence of oil leakage in the pressure and flow rate behaviours in pipeline, Latin American Journal of Energy Research, 4, 17-29 (2017)
5. De Sousa J. V. N., Sodre C. H. and De Lima A. G. B., Severino Rodrigues de Farias Neto (2013), Numerical Analysis of Heavy Oil-Water Flow and Leak Detection in Vertical Pipeline, Advances in Chemical Engineering and Science, 3, 9-15 (2013).
6. Dubyk Y., Application of Probabilistic Leak-Before-Break for WWER-1000 Unit,” Procedia Struct. Integr., 22, pp. 275–282, (2019).
7. Ferreira da Silva I. G., Paes de Andrade A. H., and Monteiro W. A., Leak-Before-Break methodology applied to different piping materials: a performance evaluation, Frattura ed Integrità Strutturale, 50, pp. 46–53, (2019).
8. Heckmann K., Elmas M. and Sievers J., Investigations on various leak types from operational experience and consequences for leak-before-break assessment of the pressure boundary, in 44th MPA-Seminar, Stuttgart, Oct. 17–18, (2018).
9. Kannan P., Amirthagadeswaran K.S. and Christopher T., Development and validation of a leak- before-break criteria for cylindrical pressure vessels, Proc. Inst. Mech. Eng. Part L: J. Mater. Des. Appl. 229(7), 636-646 (2015).
10. Kebir T., Belhamiani M., Daikh A. A., Benguediab M., and Benachour M., “Investigating the effects of crack orientation and defects on pipeline fatigue life through finite element analysis,” Fatigue of Aircraft Structures, 2023, no. 15, pp. 1–21, (2023)
11. Mansour M. A. B., Habib A., Khalifa A., Yousef Toumi K. and Chatzigeorgiou D., Computational fluid dynamic simulation of small leaks in water pipelines for direct leak pressure transduction, Computers & Fluids 57, 110-123 (2012)
12. Ogunsesan O. A., Hossain M., and Droubi M. G., Computational fluid dynamics modelling of multiphase flows in double elbow geometries, Proc. IMechE, Part E: J. Process Mech. Eng., 235, no. 6, pp. 1835–1846, (2021).
13. Roache P.J.  and Annu., Quantification of uncertainty in computational fluid dynamics’, Rev. Fluid. Mech. 29: 123 – 60 (1997)
14. Shao Yu, Yao Tian, Gong Jinzhe, Liu Jinjie, Zhang Tuqiao and Tingchao Yu, Impact of Main Pipe Flow Velocity on Leakage and Intrusion Flow: An Experimental Study, Water, 11, 118; (2019)
15. Sun T. Z., Wei Y. J., and Wang C., Prediction of cryogenic cavitation around hydrofoil by an extensional Schnerr-Sauer cavitation model, J. Phys.: Conf. Ser., 656, 012180, 2015.