Surface aging under boiling conditions is often not considered when developing surfaces for enhanced heat transfer although it is extremely important from an applicative standpoint. In this work, we developed an experimental setup for long-term boiling evaluation and prepared a protocol for carrying out long-term tests. We performed several long-term boiling tests on untreated copper, aluminium and stainless-steel surfaces at different heat fluxes. We analysed changes in heat transfer coefficient due to surface aging and defined correlations to predict heat transfer intensity changes on copper. We showed that surfaces, on which boiling actively took place, aged more intensively compared to surfaces, which were only exposed to the boiling fluid but boiling did not take place on them.
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