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High-speed visualization and image processing of sub-atmospheric water boiling on a transparent heater

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Abstract

The paper is devoted to the processing and analysis of the high-speed visualization data on water pool boiling in the pressure range of 5.5–103 kPa. The study of the vapor bubbles dynamics and evolution of void fraction near a heated wall during boiling was performed using a special design of a transparent heating element and high-speed visualization from its bottom side. To analyze the wide array of video data, automatic image processing programs were developed. As a result, a detailed statistical analysis of the growth curves and departure diameters of vapor bubbles during boiling at different pressures was carried out. It was shown that at ultra-low pressure 5.5 kPa after the departure of massive vapor bubbles the pulsating boiling regime was occurred. A method based on the estimation of void fraction near a heated wall was proposed and implemented for the description of this cyclic boiling regime at low sub-atmospheric pressure.

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Acknowledgements

The reported study was funded by the Russian Science Foundation (Project No. 18-79-00078).

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Correspondence to Vladimir Serdyukov.

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Serdyukov, V., Malakhov, I. & Surtaev, A. High-speed visualization and image processing of sub-atmospheric water boiling on a transparent heater. J Vis 23, 873–884 (2020). https://doi.org/10.1007/s12650-020-00660-z

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  • DOI: https://doi.org/10.1007/s12650-020-00660-z

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