Experimental investigation on impact dynamics and freezing performance of water droplet on horizontal cold surface

Chang, Shinan; Song, He; Wu, Ke

doi:10.1016/j.seta.2021.101128

Cited by 8 publications

(7 citation statements)

References 31 publications

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“…(e) SEM images of the SS1 structures after icing wind tunnel tests. (f) Summarization of the relationships between the size of the droplets/particles and the impacting velocity from four types of impacting experiments: water-jet impacting, solid-particle impacting, supercooled-droplet impinging, and icing wind tunnel tests. − (g) Calculated dynamic pressure P D when the droplets/particles contact the target surfaces. (h) Conceptual description diagram of pressure P versus time t according to the four impacting experiments.…”

Section: Resultsmentioning

confidence: 99%

“…Both supercooled-droplet impinging and icing wind tunnel test results demonstrate that droplet impacting is a significant factor that determines the ice-adhesion and structural damage on the substrate. To clarify how the droplet or solid-particle impacting influences and interacts with the target surfaces, we summarized the relationships between the size of the droplets/particles and the impacting velocity and illustrated the main parametric ranges from four typical experiments: water-jet impacting, solid-particle impacting, supercooled-droplet impinging, and icing wind tunnel tests (Figure f). − Water-jet impacting tests own a wide parametric range, with impacting velocities from several meters per second to tens of meters per second and droplet sizes of ∼500 to ∼3500 μm. Solid-particle impacting and supercooled-droplet impinging tests have the similar impacting velocities of several meters per second; the latter always adopts larger sizes of ∼2500 to ∼3000 μm, while the former mostly use particle sizes of less than 500 μm.…”

Section: Resultsmentioning

confidence: 99%

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Passive Anti-Icing Performances of the Same Superhydrophobic Surfaces under Static Freezing, Dynamic Supercooled-Droplet Impinging, and Icing Wind Tunnel Tests

Tian

Wang

Zhu

et al. 2023

ACS Appl. Mater. Interfaces

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Overcoming ice accretion on external aircraft wing surfaces plays a crucial role in aviation, and developing environmentally friendly passive anti-icing surfaces is considered to be a promising strategy. Superhydrophobic surfaces (SHSs) have attracted increasing attention due to their potential advantages of keeping the airframe dry without causing additional aerodynamic losses. However, the passive anti-icing performances of SHSs reported to date varied a lot under different icing test conditions. Therefore, a systematic investigation is necessary to elucidate the icing conditions where SHSs can remain effective and pave the way for SHSs toward practical anti-icing applications. Herein, we designed and fabricated a typical type of SHS featuring dual-scale hierarchical structures with arrayed micromountains (with both spacings and heights of tens of micrometers) covered by single-scale sandy-corrugation-like periodic structures (with both spacings and heights of only several micrometers) (termed SS1). Its anti-icing performances under three representative icing conditions, including static water freezing, dynamic supercooled-droplet impinging, and icing wind tunnel conditions, were comparatively investigated. The SS1 SHS maintained a lower static ice-adhesion strength (<60 kPa even after 50 deicing cycles at temperatures as low as −25 °C), which was attributed to a cumulative cracking effect facilitating the ice detachment. Within the laboratory dynamic icing tests, the SS1 SHSs with micromountain heights of 20−30 μm performed optimally in the antiadhesion of supercooled droplets (at an impinging velocity of 3.4 m/s and temperatures of −5 to −25 °C). In spite of the significant anti-icing performances of the SS1 SHSs in both static and dynamic laboratory tests, they could hardly sustain reliable passive anti-icing performances in harsher icing wind tunnel tests with supercooled droplets impinging their surfaces at velocities of up to 50 m/s at a temperature of −5 °C for 10 min. This study can inspire the development of improved SHSs for achieving satisfactory anti-icing performances in real-aviation conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Passive Anti-Icing Performances of the Same Superhydrophobic Surfaces under Static Freezing, Dynamic Supercooled-Droplet Impinging, and Icing Wind Tunnel Tests

Tian

Wang

Zhu

et al. 2023

ACS Appl. Mater. Interfaces

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“…Sun et al [22] offered two additional freezing morphologies: an irregular pattern on the plexiglass surface as well as a poached egg pattern on the metal surface. Chang et al [23] discussed the influence of the droplet release height and cold surface temperature on the freezing process of a water droplet. Tembely et al [24] numerically found that the freezing and pinning of water droplets are affected by the droplet size, impacting velocity, and cold surface temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the freezing property of impinging water droplets on inclined cold superhydrophobic surfaces

Hou

Gong

2023

Phys. Scr.

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We numerically study the freezing process of impinging water droplets on inclined cold superhydrophobic surfaces, concerning the dynamic and heat transfer properties of impinging water droplets. Increasing the surface inclination angle and decreasing the contact angle hysteresis (CAH) is found to promote the rebound of impinging water droplets at a higher cold superhydrophobic temperature (such as -10°C). The influence of the cold surface temperature on the receding side of impinging water droplets is stronger than that on the front side, and so is the CAH. The frozen region inside impinging water droplets first appears on the receding side, and this becomes more obvious as the surface inclination angle increases. The relatively intensive heat transfer process appears early in the impinging process of water droplets on an inclined cold superhydrophobic surface. Increasing the surface inclination angle could weaken the heat transfer process of impinging water droplets at a higher cold surface temperature (such as -10°C), but it is not remarkable at a lower cold surface temperature (such as -30°C). By increasing the supercooling degree, impinging Weber number, and CAH, the freezing process of impinging water droplets is enhanced.

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“…The droplet mechanism in the two-phase system, according to its physical conditions in the static environment is affected under the gravity such as shock cylinder. Chang et al (2021) experimentally surveyed droplet impact on cold surface and investigated energy conversion between droplet and environment. Ma et al (2021b) numerically simulated three-dimensional droplet impact on super cooled and rough surfaces using lattice Boltzmann method.…”

Section: Introductionmentioning

confidence: 99%

3D numerical simulation of flap geometry optimization around the cylinder to collection of split up droplet

Alishah¹,

Maddah²,

Alinejad³

et al. 2021

Fluid Dyn. Res.

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The novelty of present work is surveying deformation, split up and remained volume of Newtonian droplet impact with diameter d = 1.6, 2 and 2.4 mm and the droplet velocity in v = 1 and 2 m s −1 around the solid cylinders without flap, with simple and angle flap. Three-dimensional simulation was based on the volume of fluid method with dynamic contact angle of droplet and validated with the experimental results of a droplet impact and spread over the edge surface. Comparison split up volume of droplet between cylinder without flap, with simple and angle flap, the least percentage of split up volume of droplet (16%) was on solid cylinder with angle flap for droplet d = 1.6 mm and v = 1 m s −1 . Also, the maximum remained volume of droplet (5.1781 × 10 −9 m 3 ) was on the solid cylinder with angle flap for droplet d = 2.4 mm and v = 1 m s −1 .

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Experimental investigation on impact dynamics and freezing performance of water droplet on horizontal cold surface

Cited by 8 publications

References 31 publications

Passive Anti-Icing Performances of the Same Superhydrophobic Surfaces under Static Freezing, Dynamic Supercooled-Droplet Impinging, and Icing Wind Tunnel Tests

Passive Anti-Icing Performances of the Same Superhydrophobic Surfaces under Static Freezing, Dynamic Supercooled-Droplet Impinging, and Icing Wind Tunnel Tests

Numerical investigation of the freezing property of impinging water droplets on inclined cold superhydrophobic surfaces

3D numerical simulation of flap geometry optimization around the cylinder to collection of split up droplet

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