Drop-wise and film-wise water condensation processes occurring on metallic micro-scaled surfaces

Starostin, Anton; Вальцифер, В. А.; Barkay, Zahava; Legchenkova, Irina; Danchuk, V. V.; Bormashenko, Edward

doi:10.1016/j.apsusc.2018.03.065

Cited by 24 publications

(9 citation statements)

References 56 publications

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“…The lower density domain consists of thin layers of absorbed liquid molecules, which can be called precursor films. This phenomenon has also been found in experiment [23]. The dotted horizontal line in the figures corresponds to the bulk density.…”

Section: Resultssupporting

confidence: 84%

“…Mu et al [22] observed condensation on magnesium surfaces and have revealed the relation between fractal dimensions and nucleation sites. Starostin et al [23] have studied water condensation on superoleophobic and superhydrophobic surfaces and found that the depletion layer formed at the initial condensation stage on the substrate could affect the growth of condensation droplets.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of the Electric Field on Surface Condensation of Water Vapor: Insight from Molecular Dynamics Simulation

Wang

Xie

et al. 2019

Nanomaterials

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In this study, molecular dynamics simulations were carried out to study the coupling effect of electric field strength and surface wettability on the condensation process of water vapor. Our results show that an electric field can rotate water molecules upward and restrict condensation. Formed clusters are stretched to become columns above the threshold strength of the field, causing the condensation rate to drop quickly. The enhancement of surface attraction force boosts the rearrangement of water molecules adjacent to the surface and exaggerates the threshold value for shape transformation. In addition, the contact area between clusters and the surface increases with increasing amounts of surface attraction force, which raises the condensation efficiency. Thus, the condensation rate of water vapor on a surface under an electric field is determined by competition between intermolecular forces from the electric field and the surface.

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Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

The Impact of the Electric Field on Surface Condensation of Water Vapor: Insight from Molecular Dynamics Simulation

Wang

Xie

et al. 2019

Nanomaterials

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show abstract

“…As seen in Figure 2d, the condensed droplets exhibit nearly spherical shapes, suggesting high contact angles and a high repellency for small droplets during condensation, a condition not necessarily met on all superhydrophobic surfaces. [ 45 ] The inset in Figure 2d clearly shows the high contact angle for an individual condensate droplet. While a superhydrophobic surface may exhibit water repellency for deposited droplets, condensation nuclei may grow within the micro‐ and nanostructures to result in Wenzel‐state droplets.…”

Section: Resultsmentioning

confidence: 99%

Sprayable Thin and Robust Carbon Nanofiber Composite Coating for Extreme Jumping Dropwise Condensation Performance

Donati

Lam

Milionis

et al. 2020

Adv Materials Inter

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Condensation of water on metallic surfaces is critical for multiple energy conversion processes. Enhancement in condensation heat transfer efficiency often requires surface texturing and hydrophobicity, usually achieved through coatings, to maintain dropwise condensation. However, such surface treatments face conflicting challenges of minimal coating thermal resistance, enhanced coating durability and scalable fabrication. Here we present a thin (~ 2 μm) polytetrafluoroethylene -carbon nanofiber nanocomposite coating which meets these challenges and sustains coalescence-induced jumping droplet condensation for extended periods under highly demanding condensation conditions. Coating durability is achieved through improved substrate adhesion by depositing a sub-micron thick aluminum primer layer. Carbon nanofibers in a polytetrafluoroethylene matrix increase coating thermal conductivity and promote spontaneous surface nano-texturing to achieve superhydrophobicity for condensate microdroplets. The coating material can be deposited through direct spraying, ensuring economical scalability and versatility for a wide range of substrates. We know of no other coating for metallic surfaces that is able to sustain jumping dropwise condensation under shear of steam at 111 ℃ flowing at ~ 3 m s -1 over the surface for 10 hours and dropwise

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“…Wei et al [42] founded that the surface wettability of polypropylene fibers was significantly changed through plasma treatment. Here, NS-DBD can modify the physical and chemical features of dielectric material, which may also affect the icing process when supercooled water droplets impinge upon it [43].…”

Section: Anti-icing Performancementioning

confidence: 99%

Experimental Study on Anti-Icing Performance of NS-DBD Plasma Actuator

Chen

Liang

et al. 2018

Applied Sciences

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An experimental study was conducted to evaluate the anti-icing performance of NS-DBD plasma actuator under the conditions of airflow speed U = 65 m/s, ambient temperature T = −10 °C, liquid water content LWC = 0.5 g/m3, mean-volume diameter MVD = 25 μm, mainly to clarify the effect of pulse frequency and voltage amplitude of actuation on anti-icing performance. A NACA0012 airfoil model with a chord length of c = 280 mm was used in the tests. The NS-DBD plasma actuator was mounted at the front part of the airfoil. A FLIR infrared (IR) imager and CCD camera were used to record the anti-icing process of the NS-DBD plasma actuator. Two typical discharge conditions were selected for the anti-icing experiments. The first was HV-LF discharge, corresponding to discharge under higher voltage amplitude with lower pulse frequency; the second was LV-HF discharge, corresponding to discharge under lower voltage amplitude with higher pulse frequency. Results reveal that NS-DBD is a very promising method for anti-icing. With the same power consumption, the LV-HF discharge shows a better anti-icing performance compared to HV-LF discharge under the same icing conditions. In view of pulse duration and duty circle, combined with heat dissipation, it is suggested that there is a threshold frequency, corresponding to the voltage amplitude of electric actuation signal and the incoming flow condition, to achieve effective anti-icing performance.

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Drop-wise and film-wise water condensation processes occurring on metallic micro-scaled surfaces

Cited by 24 publications

References 56 publications

The Impact of the Electric Field on Surface Condensation of Water Vapor: Insight from Molecular Dynamics Simulation

The Impact of the Electric Field on Surface Condensation of Water Vapor: Insight from Molecular Dynamics Simulation

Sprayable Thin and Robust Carbon Nanofiber Composite Coating for Extreme Jumping Dropwise Condensation Performance

Experimental Study on Anti-Icing Performance of NS-DBD Plasma Actuator

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