Abstract
We present the results of an experimental study of heat transfer regimes during cooling in water of high-temperature, heated steel balls with a technically smooth and modified surface. The modification consisted of the application of a finely dispersed carbon coating to the surface followed by electron beam treatment. When the samples are placed in subcooled water, an intensive heat transfer regime occurs on the both samples; it appeared upon film boiling with heat fluxes on the surface up to 6 MW/m2. The heat flux values based on the initial cooling thermograms were obtained from a one-dimensional inverse heat conduction problem. The carboncoating leads to a decrease in the surface temperature, which corresponds to the transition to the intensive cooling mode, whereas the intensive cooling mode itself is identical for samples with the different surface treatments. Experimental results confirm the approximate model proposed for the conditions for the occurrence of the intensive cooling regime during film boiling of a subcooled liquid.
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The work was performed at the National Research University, Moscow Power Engineering Institute, with the support of the Russian Science Foundation, project nos. 16-19-10531 and 17-79-20402.
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Russian Text © The Author(s), 2019, published in Teplofizika Vysokikh Temperatur, 2019, Vol. 57, No. 1, pp. 72–82.
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Dedov, A.V., Zabirov, A.R., Sliva, A.P. et al. Effect of Coating by a Carbon Nanostructure on Heat Transfer with Unsteady Film Boiling. High Temp 57, 63–72 (2019). https://doi.org/10.1134/S0018151X19010048
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DOI: https://doi.org/10.1134/S0018151X19010048