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Article

Spray Cooling Heat Transfer above Leidenfrost Temperature

Faculty of Mechanical Engineering, Brno University of Technology, 60190 Brno, Czech Republic
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Metals 2020, 10(9), 1270; https://doi.org/10.3390/met10091270
Received: 17 August 2020 / Revised: 8 September 2020 / Accepted: 18 September 2020 / Published: 21 September 2020
This study considers spray cooling starting at surface temperatures of about 1200 °C and finishing at the Leidenfrost temperature. Cooling is in the film boiling regime. The paper uses experimental techniques for the study of which spray parameters are necessary for good prediction of spray cooling intensity. The research is based on experiments with water and air-mist nozzles. The following spray parameters were measured together with a heat transfer coefficient: water flowrate, water impingement density, impact pressure, droplet size and velocity. Derived parameters as droplet kinetic energy, droplet momentum and droplet Reynolds number are used in the tested correlations as well. Ten combinations of spray parameters used for correlation functions for the heat transfer coefficient (HTC) are studied and discussed. Correlation functions for prediction of HTC are presented and it is shown which spray parameters are necessary for reliable computation of HTC. The best results were obtained when the parameters impact pressure and water impingement density were used together. It was proven that the correlations based only on water impingement density, which are the most frequent in literature, can not provide reliable results. View Full-Text
Keywords: spray cooling; Leidenfrost temperature; film boiling; mist nozzle; water nozzle; heat transfer coefficient; correlation function; continuous casting; heat treatment spray cooling; Leidenfrost temperature; film boiling; mist nozzle; water nozzle; heat transfer coefficient; correlation function; continuous casting; heat treatment
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MDPI and ACS Style

Chabicovsky, M.; Kotrbacek, P.; Bellerova, H.; Kominek, J.; Raudensky, M. Spray Cooling Heat Transfer above Leidenfrost Temperature. Metals 2020, 10, 1270. https://doi.org/10.3390/met10091270

AMA Style

Chabicovsky M, Kotrbacek P, Bellerova H, Kominek J, Raudensky M. Spray Cooling Heat Transfer above Leidenfrost Temperature. Metals. 2020; 10(9):1270. https://doi.org/10.3390/met10091270

Chicago/Turabian Style

Chabicovsky, Martin, Petr Kotrbacek, Hana Bellerova, Jan Kominek, and Miroslav Raudensky. 2020. "Spray Cooling Heat Transfer above Leidenfrost Temperature" Metals 10, no. 9: 1270. https://doi.org/10.3390/met10091270

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