Prediction of the release process of the nitrogen-extinguishant binary mixture considering surface tension

Journal article


Liu, S., Xie, Y., Chen, M., Zhu, J., Day, R., Wu, H. and Yu, J. (2020). Prediction of the release process of the nitrogen-extinguishant binary mixture considering surface tension. Journal of Thermal Analysis and Calorimetry. 145, pp. 185-199. https://doi.org/10.1007/s10973-020-10040-2
AuthorsLiu, S., Xie, Y., Chen, M., Zhu, J., Day, R., Wu, H. and Yu, J.
Abstract

Nitrogen used for pressurization in the extinguisher can be partially dissolved in the fire extinguishing agent. Consequently, the evolution of the dissolved nitrogen has a significant effect on the release behavior of the fire extinguishing agent in a rapid process. In this article, a new model was developed to predict the critical pressure of the nitrogen evolution and the release process of the fire extinguishing agent was described in detail. According to the Peng-Robinson (PR) equation of state and van der Waals mixing rule, the effect of the dissolved nitrogen on the surface tension of the fire extinguishant was analyzed by considering surface phase and fugacity coefficient. A method to calculate the surface tension of the liquid agent dissolved with nitrogen was proposed. The results showed that the proposed model can determine the accurate critical pressure of the evolution of the dissolved nitrogen and further evaluated whether nitrogen escapes. At different initial filling pressure, in addition, the release process of the nitrogen-extinguishant such as CF3I, FC218 (C3F8), HFC125 (C2HF5), and Halon1301 (CF3Br) was well predicted by the fluid release model when taking the surface tension and adiabatic index of the mixture into account. Compared with the previously obtained experimental data, the predictions obtained indicated that the present model can adequately describe the liquid and the gas mixture release stage in the release process of the nitrogen-extinguishant.

Year2020
JournalJournal of Thermal Analysis and Calorimetry
Journal citation145, pp. 185-199
PublisherSpringer
ISSN1588-2926
Digital Object Identifier (DOI)https://doi.org/10.1007/s10973-020-10040-2
Publication dates
Online21 Jul 2020
Publication process dates
Deposited24 Jan 2024
Accepted author manuscript
License
File Access Level
Open
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