Influence of new superhydrophobic micro-structures on delaying ice formation

Moghadam, Ramin Kamali; Rahni, Mohammad Taeibi; Javadi, Khodayar; Davoudian, Salar Heyat; Miller, R.

doi:10.1016/j.colsurfa.2020.124675

Cited by 6 publications

(5 citation statements)

References 40 publications

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“…Obviously, the droplet dynamics contact angle (CA) with a wall surface is the most important parameter for drop motion on solid surface. The equilibrium CA, which shows the balance of energy release and small-scale dissipation, is calculated by the Young relation [14]: 𝜎 𝑠𝑙 + 𝜎 cos 𝜃 𝑒 = 𝜎 𝑠𝑔 (13) At dynamic conditions, the CA is assumed to be locally calculated by the Young relation (Eq. ( 13)).…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…Determination of the dynamic CA is very sensitive and different relations are used to determine it more accurately both theoretically and even empirically [22]. Dynamic contact angle models, including hydrodynamic models, molecular kinetic models, experimental models, as well as hybrid models are developed to obtain accurate contact angle and meniscus displacement [14]. Most of these models give the relationship between the contact line velocity and the dynamic contact angle.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…, Re = 𝜌𝑑 𝑒 𝑈 𝜇 (14) In this study, to validate the simulation, three cases are simulated at certain conditions according to table 1. The results show that the captured shapes in the present simulation and mentioned conditions are consistent to those in Ref.…”

Section: Validationmentioning

confidence: 99%

“…Also, the effects of microstructures on droplet behaviour in rest on a superhydrophobic surface is investigated using five new microstructures. It is noted that droplet dynamics on different microstructures have been studied before by the authors [14].…”

Section: Introductionmentioning

confidence: 99%

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Drop Behavior on Micro-Structured Superhydrophobic Coating

Moghadam¹,

Taeibi²,

Davoudian³

et al. 2022

JSST

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Superhydrophobic coatings can be made by creating a micro-sized structure on a surface providing super-repellent properties which have many applications in aerospace, defense, automotive, biomedical and engineering. Numerical simulation of drop dynamics and motion on a superhydrophobic surface helps us understand control and building surface textures and find optimum micro structured coatings of the maximum hydrophobicity. In the present work, the dynamics of drops on superhydrophobic inclined micro-structured surfaces is studied, using a finite element method. Effects of microstructures on droplet behavior on a superhydrophobic surface is investigated using different microstructures. The governing equations and important dimensionless numbers are described and a numerical algorithm is introduced. The validation of the numerical algorithm is performed by simulation of drop motion attached to an inclined surface. In addition, droplet movement on the micro structured surface is numerically simulated on smooth and microstructure surfaces in the same conditions. Comparison of the results shows the effect of microstructure coating on the surface hydrophobicity properties.

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Section: Boundary Conditionsmentioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Drop Behavior on Micro-Structured Superhydrophobic Coating

Moghadam¹,

Taeibi²,

Davoudian³

et al. 2022

JSST

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“…Bian et al 30 experimentally observed the morphology and growth process of ice on different near-thermal insulating surfaces at low subcooling, and found that, as the contact angle of the ice core increases, the radius of the tip increases and the effect of heat conduction on the tip decreases, leading to a slowdown in the growth rate of the tip. Ramin et al 31 used the phase field method to establish and validate a numerical approach to model the effect of different structured surfaces on ice crystal growth, and they found that microstructures with larger grooves on the upper surface than on the lower surface may result in lower surface humidity. Kobayashi 32 established a numerical model to show the morphology of dendritic ice crystal growth, and they found that the velocity of the main branches increased with the anisotropy strength.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Ice Crystal Dendritic Growth with Humidity by Using an Anisotropic Phase Field Model

Shao,

Chen,

Yang

et al. 2024

Crystal Growth & Design

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To study the growth characteristics of ice crystals under different humidities, the equation for the subcooling coefficient is fitted, and a phase-field method model based on the heat and mass transfer equation and the energy conservation equation is established. The effects of humidity, dimensionless latent heat, and anisotropic strength on the growth characteristics of ice crystals are analyzed. The results show that the radius of dendrites increases continuously when the relative humidity increases from 55% to 80%, which is 128% under the calculated conditions of this study. With the increase of dimensionless latent heat, the energy required for dendritic crystal crystallization increases and the hindrance of dendritic crystal growth becomes larger. The radius of the dendritic crystals, which increased with humidity, became smaller with increasing K, decreasing by ∼56.6%. The width of the main dendritic crystals decreases continuously with the increase of dimensionless latent heat and decreases with increases in the humidity. With the increase of anisotropic strength, the growth direction of the lateral and main branches becomes more and more anisotropic, and the radius of dendritic protrusions increases as the increase of anisotropic strength increases.

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