Reversed boiling curve phenomenon on surfaces with interlaced wettability

Hsu, Che-Chia; Chiu, Wei-Chi; Kuo, Long-Sheng; Chen, Ping‐Hei

doi:10.1063/1.4897953

Cited by 19 publications

(2 citation statements)

References 15 publications

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“…4) indicate that the tested surfaces exhibited similar boiling performance in both saturated and subcooled conditions. The lowest heat transfer coefficient was measured on the bare (untreated) stainless steel sample, where part of the boiling curve has a negative slope (at heat fluxes higher than 125 kW/m 2 ), as experimentally observed in previous studies [30]. During the saturated experiment [ Fig.…”

Section: Boiling Performancesupporting

confidence: 63%

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Voglar

Gregorčič

Zupančič

et al. 2018

International Journal of Heat and Mass Transfer

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This investigation used laser-processed 25-μm-thick stainless steel foils as heaters in pool boiling experiments under subcooled and saturated conditions at atmospheric pressure. Boling surfaces were modified by a nanosecond fiber laser. In most cases, laser-textured parts on boiling surfaces were spaced apart by a capillary length of water (2.5 mm) and had different shapes and arrangements. Multi-scale micro-cavities (with diameters ranging from 0.2 to 10 μm) on the laser-textured areas of the surfaces provided potential active nucleation sites. The highest heat flux measured before the burnout was observed on the fully treated sample; this heat flux was a factor of 3.7 greater than that of the untreated sample. The sample with hexagonally arranged textured circular shapes with a diameter of 2.0 mm provided a more than 4-fold higher heat transfer coefficient compared to the untreated sample. All of the laser-textured boiling surfaces showed enhanced pool boiling heat transfer performance in comparison to the untreated surface. The optimal spacing between the laser-textured regions was experimentally found to be equal to the capillary length of the working fluid. Our results demonstrate that laser texturing has strong potential for producing patterned surfaces for engineering applications of boiling heat transfer.

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Section: Boiling Performancesupporting

confidence: 63%

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Voglar

Gregorčič

Zupančič

et al. 2018

International Journal of Heat and Mass Transfer

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“…These results might explain the mixed wettability occur higher heat transfer coefficient at temperature region of nucleate boiling as reported by previous studies. [44][45][46] In the case of mixed wettability at 110 C of initial surface temperature, it should be noted that surface temperature decreased to 104 C upon the contact between droplet and surface. However, the boiling curve indicated that this temperature region is natural convection boiling.…”

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confidence: 99%

Influence of surface temperature and wettability on droplet evaporation

Hsu

et al. 2015

Applied Physics Letters

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The evaporation characteristics of sessile water droplets on various wettability substrates (hydrophilic, hydrophobic, and mixed wettability surfaces) were experimentally investigated in this study. Placing droplets on a regulated superheated surface led to rapid vapor bubble formation. The droplet parameters, such as the contact angle and volume evolution over evaporation time, were experimentally measured. The results revealed that surface wettability plays a critical role not only in vapor bubble dynamics but also in evaporation. V C 2015 AIP Publishing LLC.

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