Investigation of nano-droplet wetting states on array micro-structured surfaces with different gravity

Xu, Bo; Zhang, Cancan; Chen, Zhenqian; Yang, Yang; Cao, Qian

doi:10.1016/j.compfluid.2021.104936

Cited by 8 publications

(5 citation statements)

References 46 publications

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“…When h = 21.7236–32.5854 Å, the droplets are in the Cassie state and the wetting state no longer changes with the pillar height increasing. Such a pattern was also obtained by Xu et al in their study. To observe the contact interface morphology, the aluminum atoms above 3 Å from the substrate are removed, exposing the contact surface between the molten droplets and the substrate surface, as shown in the snapshots below Figure a–f.…”

Section: Resultssupporting

confidence: 86%

Effect of Nanopillars on the Wetting State and Adhesion Characteristics of Molten Aluminum Droplets

He,

Rui,

Lyu

et al. 2023

Langmuir

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To solve the adhesion problem between molten aluminum and vacuum ladle liner during the electrolytic aluminum production process, the wetting state and adhesion properties of molten aluminum droplets on substrate surfaces with different nanopillars are investigated based on molecular dynamics. The results show that the adhesion strength of molten aluminum droplets in different wetting states has the pattern Young state > Wenzel state > Cassie state. Effects of increasing nanopillar height or interval are poles apart in the wetting state and adhesion characteristics of aluminum molten droplets. The critical height and critical interval of the nanopillar where the wetting state transition occurs are obtained. The increase of the nanopillar width can induce the wetting state transition from the Cassie state to the Wenzel state. In addition, the phantom wall method is applied to study the variation of the separation force. It is found that a peak in the separation force curve occurs when the molten droplet separates from the bottom of the nanopillar interval or the top of the nanopillar. The separation force curves of the droplets in the Young state and the Cassie state have single peaks, while the droplets in the Wenzel state have double peaks.

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Section: Resultssupporting

confidence: 86%

Effect of Nanopillars on the Wetting State and Adhesion Characteristics of Molten Aluminum Droplets

He,

Rui,

Lyu

et al. 2023

Langmuir

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show abstract

“…It can be seen that the results of this investigation closely resemble those of ref. 15 and 27, which further supports the validity and dependability of this study. ε Cu–O and the contact angle θ can be fit as θ = −0.331.51 ε Cu–O + 174.62 by linear regression with the coefficient of determination R 2 = 0.9977.…”

Section: Resultssupporting

confidence: 85%

“…The contact angles with various ε Cu–O are computed using full relaxation according to the scaling down factor of 200 000 and are then compared with ref. 15 and 27, as shown in Fig. 3.…”

Section: Resultsmentioning

confidence: 89%

“…With a droplet diameter of 55.8 Å, Xu et al examined the wetting states of nano-droplets on an array of micro-structured surfaces with various gravities and discovered a rule for the transition from Cassie to Wenzel-Cassie to Wenzel. 15 Using water droplets measuring 60 Å in diameter and containing 13 092 water molecules, Ding et al investigated the anisotropic behaviors of these droplets on textured surfaces. 16 These studies, however, did not compare experimental measurements with a realistic droplet-to-textured-surface ratio.…”

Section: Introductionmentioning

confidence: 99%

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Proportional scaling molecular dynamics simulations of the wetting experiments of water droplets on ink-patterned printing paper

Wang,

Chen,

Zhang

et al. 2023

RSC Adv.

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“…Instead, the possible effect of gravity force on the droplet state is not well addressed in the literature. Xu et al 86 performed molecular dynamics simulations of the water wetting on an array of micro pillars under different gravity conditions. They found that a microgravity environment favored the transition from Wenzel state to Wenzel-Cassie or Cassie state.…”

Section: Effect Of Gravity During Dropwise Condensationmentioning

confidence: 99%

Condensation heat transfer in microgravity conditions

et al. 2023

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In the present paper, a thorough review of the experimental and numerical studies dealing with filmwise and dropwise condensation under microgravity is reported, covering mechanisms both inside tubes and on plain or enhanced surfaces. The gravity effect on the condensation heat transfer is examined considering the results of studies conducted both in terrestrial environment and in the absence of gravity. From the literature, it can be inferred that the influence of gravity on the condensation heat transfer inside tubes can be limited by increasing the mass flux of the operating fluid and, at equal mass flux, by decreasing the channel diameter. There are flow conditions at which gravity does exert a negligible effect during in-tube condensation: predictive tools for identifying such conditions and for the evaluation of the condensation heat transfer coefficient are also discussed. With regard to dropwise condensation, if liquid removal depends on gravity, this prevents its application in low gravity space systems. Alternatively, droplets can be removed by the high vapor velocity or by passive techniques based on the use of condensing surfaces with wettability gradients or micrometric/nanometric structuration: these represent an interesting solution for exploiting the benefits of dropwise condensation in terms of heat transfer enhancement and equipment compactness in microgravitational environments. The experimental investigation of the condensation heat transfer for long durations in steady-state zero-gravity conditions, such as inside the International Space Station, may compensate the substantial lack of repeatable experimental data and allow the development of reliable design tools for space applications.

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Investigation of nano-droplet wetting states on array micro-structured surfaces with different gravity

Cited by 8 publications

References 46 publications

Effect of Nanopillars on the Wetting State and Adhesion Characteristics of Molten Aluminum Droplets

Effect of Nanopillars on the Wetting State and Adhesion Characteristics of Molten Aluminum Droplets

Proportional scaling molecular dynamics simulations of the wetting experiments of water droplets on ink-patterned printing paper

Condensation heat transfer in microgravity conditions

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