Study of Nucleate Pool Boiling Heat Transfer Enhancement on Surfaces Modified by Beam Technologies

Heat Transfer on Micro and Nanostructured Rough Surfaces Synthesized by Plasma

“…For this surface, an increase in the HTC by up to 40% was obtained compared to the unmodified surface. The comparison results are shown in Figure 12 [81]. A slight decrease in the CHF was registered for this surface, which is typical for material with a highly porous structure.…”

“…In this case, unlike many other methods, long-term preservation of the working properties of the surface is ensured according to the data [101]. Exposure to plasma to modify the surface is possible in facilities such as plasma torches [103,104,107] and special plasma facilities, for example [81,105].…”

“…The advantages of the practical application of the surface treated with plasma [81,103,104,107], in comparison with surface modification by other methods (see reviews [88][89][90][91][92][93][94][108][109][110]), are high rates of intensification of heat transfer and CHF achieved (up to four times) in comparison with the unmodified surface. Surface treatment by high-temperature plasma makes it possible to form a surface structure that is resistant to degradation, especially using refractory metals in special heat exchange devices.…”

“…It opens new opportunities for significant intensification of two-phase heat transfer. It was demonstrated recently in experiments with a high-porous surface modified by high-temperature plasma in the PLM plasma device [81,106]. The study of pool boiling on the surface treated by PLM plasma resulted in new achievements in HTC.…”

“…A distinctive feature of two-phase heat transfer from a single-phase one is the disproportionate improvement in heat transfer to the coefficient of development (increase) of the surface, the influence of many factors, and physical and chemical properties on the results obtained. As an example, Figure 10 shows data on the relative increase in critical heat fluxes (CHF, maximum heat flux density during nucleate boiling) depending on the coefficient of development (increased specific area) of the surface obtained by pool boiling of saturation water in some of the most cited experiments on modified surfaces [81]. As can be seen, the maximum increase is explained not by an increase in the heat exchange surface but precisely by the influence of a change in the characteristic properties of the surface.…”