Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Direct-contact heat transfer of single droplets in dispersed flow film boiling: Experiment and model assessment

  • Park, Junseok (Department of Nuclear Engineering, Kyung Hee University) ;
  • Kim, Hyungdae (Department of Nuclear Engineering, Kyung Hee University)
  • Received : 2020.08.10
  • Accepted : 2021.02.15
  • Published : 2021.08.25
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Abstract

Direct-contact heat transfer of a single saturated droplet upon colliding with a heated wall in the regime of film boiling was experimentally investigated using high-resolution infrared thermometry technique. This technique provides transient local wall heat flux distributions during the entire collision period. In addition, various physical parameters relevant to the mechanistic modelling of these phenomena can be measured. The obtained results show that when single droplets dynamically collide with a heated surface during film boiling above the Leidenfrost point temperature, typically determined by droplet collision dynamics without considering thermal interactions, small spots of high heat flux due to localized wetting during the collision appear as increasing Wen. A systematic comparison revealed that existing theoretical models do not consider these observed physical phenomena and have lacks in accurately predicting the amount of direct-contact heat transfer. The necessity of developing an improved model to account for the effects of local wetting during the direct-contact heat transfer process is emphasized.

Keywords

Acknowledgement

This work was supported by Korea Hydro & Nuclear Power Co., Ltd. (No. 2018-TECH-08). This work was also supported by National Research Foundation of Korea (NRF) funded by the Korean government (MSIT: Ministry of Science and ICT) (2017M2A8A4015283).

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