Suppressing condensation frosting using micropatterned ice walls

Zuo, Zichao; Zhao, Yugang; Li, Kang.; Zhang, Hua; Yang, Chun

doi:10.1016/j.applthermaleng.2023.120099

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…Notably, no frost growth is observed in the gaps between the ice beads, affirming our earlier conjectures. It is important to recognize that ice, with its lower saturation vapor pressure compared to water, can also function as a hygroscopic material. , …”

Section: Resultsmentioning

confidence: 99%

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Guiding Ambient Vapor to Condense at the Fixed Pattern on Micronano Hierarchically Aluminum Substrate for Antifrost Application

Cui,

Yin,

Zhou

et al. 2024

ACS Appl. Nano Mater.

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Vapor spontaneously diffuses from areas of high concentration to areas of low concentration as a consequence of the Second Law of Thermodynamics and the hunt for maximum entropy. The distribution of substances with lower saturated vapor pressures on a surface can create this concentration slope in the space. However, most substances, except ice, cannot maintain this slope because humidity sinking causes their saturated vapor pressure to drop. Moreover, the location of ice growth is difficult to control. In this paper, a pattern of CaCl 2 was made on the micronano hierarchically aluminum substrate. When the temperature drops below zero, the vapor pressure at the position where CaCl 2 is located is low relative to that of water as a way to achieve a continuous phase transition from solid CaCl 2 to brine to ice. Thus, vapor nearby continuously diffuses to and deposits at the site, resulting in a lasting dry region around without water condensation. The frost growing on the pattern is also fluffy and can be easily removed by gravity and/or wind. This work has promising applications in areas where it is extremely difficult to use active deicing methods.

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Section: Resultsmentioning

confidence: 99%

“…It is important to recognize that ice, with its lower saturation vapor pressure compared to water, can also function as a hygroscopic material. 48,49 3.4. Frosting and Passive Defrosting Behavior.…”

Section: Hygroscopic Array Frost Inhibitionmentioning

confidence: 99%

Guiding Ambient Vapor to Condense at the Fixed Pattern on Micronano Hierarchically Aluminum Substrate for Antifrost Application

Cui,

Yin,

Zhou

et al. 2024

ACS Appl. Nano Mater.

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“…It's essential to note that the results would vary if the final saturation were assumed with respect to ice. When comparing water and ice at the same temperature, the saturation vapor pressure over water is higher than that over ice 28 . This means that at a specific temperature, water molecules have a higher tendency to evaporate and enter the vapor phase compared to ice molecules' tendency to sublimate and enter the vapor phase.…”

Section: Critical Temperaturesmentioning

confidence: 91%

Carbon-Free Fuels Can Increase Aviation-Induced Cloudiness

Vasel-Be-Hagh,

Cannon,

Hagan

et al. 2024

Preprint

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This study evaluates the potential of a newly introduced carbon-free, ammonia-powered propulsion system in contrast to conventional propulsions powered by jet fuel in forming condensation trails (contrails). Contrail formation in an airplane's wake relies on two main prerequisites. Firstly, the system's thermodynamics must lead to supersaturation. Secondly, aerosol particles must be present to provide surfaces for solidification, enabling the formation of visible ice crystals. While this study primarily analyzes the first requirement, it leverages the insights gained to comment on the second prerequisite, arguing that although ammonia does not generate soot particles, it dramatically warms the critical temperature required for supersaturation. Therefore, given that aerosol particles are consistently generated or released into the atmosphere through natural and human-made processes, which is why natural clouds can form anyway, increased critical temperatures caused by ammonia result in contrails that would not occur if jet fuel were employed. Hence, while ammonia's contrail might not be as dense as jet fuel's as it lacks soot particles in the exhaust gas, it can form at lower altitudes where the air is warmer. Moreover, it can endure longer due to the increased water content, which preserves supersaturation for longer as fresh air dilutes the contrail.

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