Abstract
A study on the heat transfer, critical heat fluxes, and dynamics of vaporization during boiling of liquid nitrogen at pressures of 0.1 and 0.018 MPa under conditions of stationary heat release has been carried out. The test sections were a smooth copper plate and a plate with a capillary-porous coating created by additive 3D printing. It has been shown that the presence of the coating leads to significant intensification of the heat transfer, up to 6 times, and an increase in the critical heat flux of 30% as compared with the smooth sample. High-speed video recording of the boiling was carried out, on the basis of which experimental data on the bubble departure diameters were obtained and qualitative assessment of the density of active nucleation sites for both types of heaters was performed.
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Pavlenko, A.N., Kuznetsov, D.V. & Bessmeltsev, V.P. Experimental Study on Heat Transfer and Critical Heat Flux during Pool Boiling of Nitrogen on 3D Printed Structured Copper Capillary-Porous Coatings. J. Engin. Thermophys. 30, 341–349 (2021). https://doi.org/10.1134/S1810232821030012
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DOI: https://doi.org/10.1134/S1810232821030012