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Hierarchical surfaces comprised of both microscale and nanoscale structures have been previously studied as a means of targeting multiple length scales to achieve superior pool boiling performance. However, preceding studies have focused almost exclusively on high surface tension working fluids while technologically important low surface tension fluids have remained largely unexplored. In this work, we utilize scalable manufacturing techniques to realize four separate surface types (planar, nanoscale-modified, microscale-modified, and hierarchical) and experimentally determine their respective pool boiling performance within the low surface tension commercial working fluid HFE-7100. A maximum heat transfer enhancement of 125 % at 38 K of superheat was observed for the best performing samples, which interestingly were nanoscale-modified and not those of the hierarchical type. Visual observations via high-speed video analysis of vapor bubble behaviour are utilized to explain the underlying multiphase physics as to why these samples performed so well and future directions for achieving surface optimization across multiple length scales.more » « lessFree, publicly-accessible full text available January 2, 2025
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Doran, Brendon ; Zhang, Bin ; Davani, Shayan ; Osafo, Kojo Asiamah ; Sutka, Owen ; Walker, Abigail ; Mueller, Nicholas ; Akwaboa, Stephen ; Mensah, Patrick ; Meng, W.J. ; et al ( , International Journal of Heat and Mass Transfer)null (Ed.)
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Mofidian, S. M. ; Davani, Shayan ; Momeni, Kasra ; Bardaweel, Hamzeh ( , IEEE Sensors Journal)