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Thermal radiation attenuation performance of fine water spray using twin-fluid nozzles with multiple holes

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Abstract

Thermal radiation attenuation (TRA) performance of fine water spray was experimentally examined using three internal-mixing types of twin-fluid nozzles (TFNs) with multiple holes of different sizes. To characterize the fine water spray, the droplet diameter, spray width, and inlet fluid pressures were measured and reported in detail. TRA rates of TFNs increased with increasing flow rates of both fluids, which were 10.6–52.4 %. TFNs with small holes exhibited higher TRA rates than those with large holes. Moreover, the TFN with multiple holes exhibited higher TRA rates than that with a single hole. Comparing these results with those of previous studies indicates that the TFNs have significant advantages in generating tiny droplets of water spray under the lower inlet fluid pressures and achieving higher TRA rates at the same water flow rate conditions (i.e., consuming less amount of water to achieve the same TRA rate) when compared with the single-fluid nozzles.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2021R1F1A1064002). This paper was supported by the “National Fire Agency” R&D program [grant number 20016433]. This manuscript was prepared by revising and improving the contents of the first author’s thesis for M.S. degree.

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Authors and Affiliations

  1. Division of Architectural and Fire Protection Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan, 48513, Korea

    Jae Geun Jo & Chi Young Lee

  2. Fire Explosion Research Department, Energy Safety Empirical Research Center, Korea Gas Safety Corporation, 1467-51, Songhakjucheon-ro, Jucheon-myeon, Yeongwol-gun, Gangwon-do, 26203, Korea

    Jae Geun Jo

  3. Department of Fire Protection Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan, 48513, Korea

    Chi Young Lee

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  1. Jae Geun Jo
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Correspondence to Chi Young Lee.

Additional information

Jae Geun Jo is a researcher in the Fire Explosion Research Department of Energy Safety Empirical Research Center at the Korea Gas Safety Corporation, Republic of Korea. He received his M.S. degree in the Division of Architectural and Fire Protection Engineering (Major of Fire Protection Engineering) from Pukyong National University, Republic of Korea. His research interests include water mist fire protection and fire dynamics.

Chi Young Lee is an Associate Professor in the Department of Fire Protection Engineering at the Pukyong National University, Republic of Korea. He received his Ph.D. degree in Mechanical Engineering from KAIST (Korea Advanced Institute of Science and Technology), Republic of Korea. His research interests include thermal-fluids and fire engineering.

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Jo, J.G., Lee, C.Y. Thermal radiation attenuation performance of fine water spray using twin-fluid nozzles with multiple holes. J Mech Sci Technol 37, 5431–5440 (2023). https://doi.org/10.1007/s12206-023-0942-3

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  • DOI: https://doi.org/10.1007/s12206-023-0942-3

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