The Onset of nucleate boiling of self - rewetting fluids in microchannels [Elektronski vir]
Sitar, Anže ...
The comparative experimental analysis of flow boiling of pure water and four dif ferent self - rewetting fluids (6% butanol, 2 % pe nt anol, 0.6% hexanol and 0.15 % heptanol aqueous solution) was ...performed in an array of interconnected 50%50 %m microchannels. The results show that the onset of boiling was postponed to higher surface superheats when SRFs were used instead of water. In add ition, the visualization of the flow boiling of self - rewetting fluids showed a substantially more abrupt and unstable flow, which was observed as a misty two - phase flow in the microchannel array. Both occurrences are attributable to (i) the absence of prop erly sized nucleation cavities in the microchannels and (ii) higher achieved temperatures during boiling of self - rewetting fluids, which lead to a higher momentum force of the emerging vapor phase. The measured static and dynamic contact angles and therefo re also the surface tension of the used self - rewetting fluids are lower in comparison with water.
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