Experimental and Model Studies of Various Size Water Droplet Impacting on a Hydrophobic Surface

Abubakar, Abba Abdulhamid; Yilbaş, Bekir Sami; A-Qahtani, M. Hussain; Hassan, Ghassan; Yakubu, Mubarak; Bahatab, Saeed; Adukwu, John A. E.

doi:10.1115/1.4049930

Cited by 13 publications

(2 citation statements)

References 22 publications

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“…It was similar to the results in this test. It has also been proposed by other scholars that increasing the diameter of the droplet increases the diameter of the wetted area on the impact surface ( Abubakar et al., 2021 ). The same phenomenon was also observed in this test, in which the spread area of the droplet impact burr surface increased with the increase of droplet diameter.…”

Section: Discussionmentioning

confidence: 91%

Investigation of factors enhancing droplets spreading on leaves with burrs

Wang,

Xu,

et al. 2023

Front. Plant Sci.

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IntroductionSpread effect is one of the aspects on deposition quality evaluation of pesticide droplets. It could be affected by many factors such as the microstructure of the target plant leaf surface, physical features of the droplets, and the concentration of spray additives.MethodsIn this study, using a high-speed photography system, 2.3% glyphosate ammonium salt solution with different concentration of the additive was applied to investigate the impact process of single droplet deposition on the plant leaf surface with burrs. Effect of droplet sizes and velocities on spreading area and dynamic deposition procedure was analyzed using image processing programs.ResultsThe diffusion factor in the process of droplet spreading was changed over time. The occurrence of bubbles in the droplets was observed in the results. With the bubble generation, the droplet diameter expands and a better diffusion effect is obtained. As a result, better spreading effect was obtained as the droplet diameter was expanded with the generation of bubbles. The significant effects of each physical property of droplets on droplet spreading and the interaction effects between the influencing factors were analyzed. A significant correlation was found between additive concentration, droplet impact velocity, droplet diameters and droplet spreading area. All interactions of concentration:velocity, concentration:diameter, velocity:diameter, and concentration:velocity:diameter had a significant effect on the spreading area of droplets. The study of the factors influencing the process of pesticide droplet impact on the leaf surface contributes to the efficient use of pesticides. Thus, the consumption of pesticides and the resulting impact on the environment can be reduced.

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Section: Discussionmentioning

confidence: 91%

Investigation of factors enhancing droplets spreading on leaves with burrs

Wang,

Xu,

et al. 2023

Front. Plant Sci.

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“…Furthermore, the viscosity of the droplet played a crucial role in its spreading and retracting process. Abubakar et al [12,13] studied the effect of droplet size on impact characteristics on a flat hydrophobic surface. They reported that increasing the size of the droplet results in an enlargement of the wetting diameter on the impacted surface.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Dynamic Collision Behaviors of a Hydrous Ethanol Droplet on a Heated Surface

et al. 2023

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This study uses high-speed imaging to investigate the dynamic collision behavior of a single hydrous ethanol droplet in different water/ethanol ratios on a heated horizontal glass surface. The initial droplet diameter varied from 3.3 to 4.1 mm, and the impact velocity was 0.57 m/s. The study covers a range of surface temperatures (373 K to 553 K) and ethanol mass fractions (0% to 100%) to reveal four regimes of droplet-impinging behaviors, including quiescent surface evaporation, puffing or partial boiling, explosive nuclear boiling, and the Leidenfrost effect. The addition of volatile ethanol to less volatile water shifts the droplet collision behavior toward explosive boiling and the Leidenfrost phenomenon. As the ethanol mass fraction increased from 0% to 100%, the superheat limit temperature decreased by approximately 80 K, while the Leidenfrost temperature decreased by at least 100 K. The dimensionless droplet diameter in the regime of droplet spreading with quiescent surface evaporation is influenced by surface temperature, surface tension, and viscosity. Meanwhile, the dimensionless diameter and height of a droplet in the regime of the Leidenfrost phenomenon are mainly influenced by its surface tension. The study concludes that a single parameter, such as the superheat level, Weber number, or Reynolds number, is difficult to describe droplet collision behavior, and multiple factors would be required to best describe droplet collision behavior and establish empirical correlations. However, it is feasible to predict partial collision behaviors by using one of the single parameters under certain conditions.

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Impact of Two Successive Compound Droplets Undergoing Thermal Convection

Nguyen

2023

Iran J Sci Technol Trans Mech Eng

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Experimental and Model Studies of Various Size Water Droplet Impacting on a Hydrophobic Surface

Cited by 13 publications

References 22 publications

Investigation of factors enhancing droplets spreading on leaves with burrs

Investigation of factors enhancing droplets spreading on leaves with burrs

A Study on the Dynamic Collision Behaviors of a Hydrous Ethanol Droplet on a Heated Surface

Impact of Two Successive Compound Droplets Undergoing Thermal Convection

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