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Heat Transfer during Nitrogen Boiling on Surfaces Modified by Microarc Oxidation

Author

Listed:
  • Denis Kuznetsov

    (Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Science, Ac. Lavrentyev Ave., 1, 630090 Novosibirsk, Russia)

  • Aleksandr Pavlenko

    (Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Science, Ac. Lavrentyev Ave., 1, 630090 Novosibirsk, Russia)

Abstract

Despite the many different methods for creating modified heat transfer surfaces to increase critical heat fluxes and heat transfer coefficients at pool boiling of various liquids at given reduced pressures, active research is currently underway to find optimal surface morphology and geometric parameters of structures for practical application. In this work, we used the method of microarc oxidation (MAO) to obtain coatings with different microstructures on the surface of duralumin heaters. In the present work, we studied the effect of MAO coatings on heat transfer, critical heat flux, and evaporation dynamics during liquid nitrogen boiling under conditions of steady-state heat release at pressures of 0.1, 0.05, and 0.017 MPa. It was shown that the modification of heaters led to a 50–60% increase in heat transfer coefficients as compared to the smooth one under the atmospheric pressure. Based on the data of high-speed video filming of boiling, it was shown that the main mechanism of intensification is the increase in quantity of active nucleation sites. A significant decrease in pressure led to the absence of a significant difference in both heat transfer intensity and evaporation dynamics for the smooth and modified heaters.

Suggested Citation

  • Denis Kuznetsov & Aleksandr Pavlenko, 2022. "Heat Transfer during Nitrogen Boiling on Surfaces Modified by Microarc Oxidation," Energies, MDPI, vol. 15(16), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:16:p:5792-:d:884444
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    References listed on IDEAS

    as
    1. Łukasz J. Orman & Norbert Radek & Jacek Pietraszek & Marcin Szczepaniak, 2020. "Analysis of Enhanced Pool Boiling Heat Transfer on Laser—Textured Surfaces," Energies, MDPI, vol. 13(11), pages 1-19, May.
    2. Abhishek Kumar & Kuo-Shu Hung & Chi-Chuan Wang, 2020. "Nucleate Pool Boiling Heat Transfer from High-Flux Tube with Dielectric Fluid HFE-7200," Energies, MDPI, vol. 13(9), pages 1-16, May.
    3. Chen, Jingtan & Ahmad, Shakeel & Cai, Junjie & Liu, Huaqiang & Lau, Kwun Ting & Zhao, Jiyun, 2021. "Latest progress on nanotechnology aided boiling heat transfer enhancement: A review," Energy, Elsevier, vol. 215(PA).
    4. Robert Kaniowski & Robert Pastuszko, 2021. "Pool Boiling of Water on Surfaces with Open Microchannels," Energies, MDPI, vol. 14(11), pages 1-21, May.
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