Nucleate boiling of water using nanostructured surfaces

作者：Heitich L V; Passos J C^*; Cardoso E M; da Silva M F; Klein A N

来源：Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2014, 36(1): 181-192.

DOI：10.1007/s40430-013-0058-2

• Nucleate boiling
• Nanostructures
• Nanofluids
• Maghemite
• Contact angle

The aim of this study was to analyze the effect of nanostructured surfaces on the nucleate boiling of distilled water at saturation temperature and atmospheric pressure. The nanostructures studied consisted of nanoparticles of molybdenum (obtained by the sputtering method) and of maghemite, deposited on a substrate of very thin Constantan tape. The results obtained with the nanostructures were compared with experimental data for smooth and rough tapes (substrate). The nanostructures increased the surface wettability, especially in the case of the maghemite deposition, and consequently increased the critical heat flux values. An increase in the heat transfer coefficient was observed only for high heat fluxes. The measurement of the apparent contact angle showed that the rough substrates are highly hydrophobic and enhance the heat transfer coefficient.

• 出版日期2014-1