An Atomization Model of Air Spraying Using the Volume-of-Fluid Method and Large Eddy Simulation

Yan, Chuanwei; Chen, Shiming; Chen, Wenzhuo; Hu, Jun; Jiang, Junze

doi:10.3390/coatings11111400

Cited by 6 publications

(10 citation statements)

References 23 publications

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“…A previously mentioned study [9] selected large eddy simulations for spray turbulence prediction. However, it are found that its computational volume rises sharply with an increase in the number of paint droplets, and thus they considered it not suitable for carrying out the paint atomization simulation with variable parameters.…”

Section: Discussion On Turbulence Modelsmentioning

confidence: 99%

“…Moreover, the spatial distribution characteristics of droplet size was obtained through coupling the method of volume of fluid with the discrete phase model (VOF-DPM). Chen et al [9] established an air spray atomization model based on a large eddy simulation and carried out 2D spray atomization simulations. In order to explore the initial atomization liquid film breaking mechanism of the centrifugal nozzles of a rocket motor, Xiang [79] carried out an numerical simulation to explore the initial atomization liquid film breaking mechanism of the centrifugal nozzle based on the VOF and LES method, and a comparison of the high-speed photographic images with the simulation results shows acceptable errors.…”

Section: Research On Atomization Characteristics and Mechanismsmentioning

confidence: 99%

“…The spraying methods include air spraying [8][9][10], electrostatic spraying [11,12], plasma spraying [13][14][15], high-pressure airless spraying [16,17], etc. Airless spraying, owing to its unique spraying principle, always features excellent film quality, spraying efficiency, coating adhesion and environmental friendliness, and it is capable of achieving high-viscosity, high solid component and thick-coat spraying.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

Wu,

Chen,

Liu

et al. 2023

Coatings

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The special surface appearance of complex surfaces restricts the coating film quality of spraying. The study of the atomization and film formation characteristics of typical complex surfaces, as well as the spraying mechanism, is essential for planning the spraying robotic trajectory and improving the spraying efficiency. In this paper, modeling and characteristics of the atomization and film formation process, based on CFD numerical simulations in previous studies, are systematically reviewed, focusing especially on airless spraying. In addition, the advantages and disadvantages of the existing research from the perspective of numerical models and methods are discussed. Finally, a further research direction for spraying on complex surface is prospected. Overall, a comprehensive and up-to-date review of spray atomization and film formation characteristics is considered valuable to practitioners and researchers in these fields, and will facilitate the further application of robotic spraying in the mechanical, automotive, marine, aerospace, petrochemical and other industries.

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Section: Discussion On Turbulence Modelsmentioning

confidence: 99%

Section: Research On Atomization Characteristics and Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

Wu,

Chen,

Liu

et al. 2023

Coatings

Self Cite

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show abstract

“…The research on the film formation model is mainly based on the method of computational fluid dynamics (CFD) now. According to the different treatment methods of paint droplets, there are the Eulerian-Eulerian approach [8][9][10] and the Eulerian-Lagrangian approach [11]. The Eulerian-Lagrangian approach takes the mass, momentum, energy, and compositional exchange between discrete and continuous phases through the physical properties of individual droplets into account.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Characteristics of Airless Spray Film Formation

Yang

Chen

et al. 2022

Coatings

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Based on the computational fluid dynamics (CFD) theory, this paper proposes a film formation model and a numerical simulation method that can be used in thickness prediction of airless spraying robots. The spraying flow field and the film formation process in the airless spraying process were simulated by the Eulerian–Eulerian approach, and the airless spraying film formation model including the paint expansion model and the wall hitting model was established. To verify the correctness of the model, numerical simulations of static spraying and dynamic spraying were carried out on the plane and arc surfaces. The simulation results showed that the width of the spraying flow field on the far wall increased linearly with the longitudinal distance in the major-axis direction. The busbar spraying on the outer surface of the arc surface showed the similar characteristics to the plane in the major-axis direction. Besides, the annular spraying was similar to the plane spraying in the minor-axis direction, but the inner surface spraying was completely opposite. When spraying the outer surface, the film thickness increased with the increase of the inner diameter but was smaller than that of the plane spraying, while the inner surface spraying was completely opposite. In the spraying experiment, the plane dynamic spraying and the arc plane inner and outer surface translation spraying were selected for verification. The experimental results were in good agreement with the simulation results, indicating that the film formation model of airless spraying established in this paper is basically correct. As a result, this model can be used for thickness prediction of spraying robots.

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“…The droplet-wall impact model can be categorized into four modes: adhesion, rebound, wall-attached jet, and splashing [37,38]. The Weber number can be used as a basis for judging the impact model, and the Weber number is calculated as:…”

mentioning

confidence: 99%

An Original UV Adhesive Watermelon Grafting Method, the Grafting Device, and Experimental Verification

Zhang,

Kong,

et al. 2024

Horticulturae

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This study is aimed at traditional vegetable grafting using a large number of plastic clips, which cannot be recycled in time and cause serious pollution within the planting environment. This paper proposes a new grafting method based on a UV adhesive instead of plastic clips. First of all, a UV adhesive spray grafting device was designed. The structure includes seedling adsorption positioning mechanisms, a butt joint mechanism, a handling mechanism, a spray valve, a UV curing lamp, etc., to facilitate the adhesive spraying. For the rootstock and scion, a horizontal, lateral seedling and negative pressure adsorption and positioning method is adopted, with fluid dynamics simulation of the diameter and quantity of the adsorption holes in the rootstock adsorption mechanism carried out using Fluent 2022 R1 software and completion of the optimization of the parameters of the adsorption and positioning mechanism. The fluid volume method is used to simulate the adsorption and positioning mechanism. For optimization, the volume of fluid method (VOF) and the discrete particle method (DPM) are used in a coupled simulation of the UV adhesive spraying process, and the value range of the spraying influencing factors is determined: the selected glue pressure, atomization pressure, and spraying height for three-factor, three-level orthogonal simulation. A grafting test is also verification, deriving the significance ranking of their impact on the success rate of the grafting: atomization pressure > spraying height > glue pressure. Under the condition of a 0.25 Mpa atomization pressure, a 0.15 Mpa glue supply pressure, and a 10 mm spraying height, the grafting success rate for watermelon was 100%, the effective spraying rate was 83.03%, the healing success rate was 94.5%, and the length of the film was 7.86 mm. The results of the study can provide a research basis for the research and development of new types of spraying and grafting robot technology.

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An Atomization Model of Air Spraying Using the Volume-of-Fluid Method and Large Eddy Simulation

Cited by 6 publications

References 23 publications

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

Modeling and Characteristics of Airless Spray Film Formation

An Original UV Adhesive Watermelon Grafting Method, the Grafting Device, and Experimental Verification

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