Spherical volume elements scheme for calculating van der Waals force between irregular particles and rough surfaces

Han, Xiang; Xiao, Guangzong; Chen, Xinlin; Xiong, Wei; Yang, K.C; Luo, Hui

doi:10.1016/j.cjph.2021.01.016

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…Researchers have been able to understand the adhesion mechanism of gecko feet and have promoted the development of biomimetic adhesion materials [4][5][6]. Based on the van der Waals force contact principle, biomimetic adhesive materials may exhibit stable contact performance in complex environments [7,8]. The van der Waals force exists in the molecules on the surface of various objects without any requirements regarding the environment, so it is employed by animals such as geckos to adhere to the surfaces of various objects [9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Simulation and Parameter Analysis of Contact Mechanics for Mimicking Geckos’ Foot Setae Array

Lin¹,

Yue

et al. 2022

Crystals

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According to the dynamic characteristics of the adhesion desorption process between gecko-like polyurethane setae and the contact surface, the microcontact principle of an elastic sphere and plane is established based on the Johnson–Kendall–Robert model. On this basis, combined with the cantilever beam model, microscale adhesive contact models in the case of a single and an array of setae are obtained. The contact process is numerically simulated and verified by the adhesion desorption test. After that, the effects of external preload, the elastic modulus of setae material, the surface energy, and the surface roughness on the contact force and depth during the dynamic contact process of setae are studied. The results show that the error between the simulation and test is 15.9%, and the simulation model could reflect the real contact procedure. With the increase in preload, the push-off force of the setae array would grow and remain basically constant after reaching saturation. Increasing the elastic modulus of setae material would reduce the contact depth, but have little effect on the maximum push-off force; with the increase in the surface energy of the contact object, both the push-off force between the objects and the contact depth during desorption would increase. With the increase in wall roughness, the push-off force curve of the setae array becomes smoother, but the maximum push-off force would decrease. By exploring the dynamic mechanical characteristics of the micro angle of setae, the corresponding theoretical basis is provided for the numerical simulation of the adsorption force of macro materials.

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Section: Introductionmentioning

confidence: 99%

Dynamic Simulation and Parameter Analysis of Contact Mechanics for Mimicking Geckos’ Foot Setae Array

Lin¹,

Yue

et al. 2022

Crystals

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show abstract

“…Several models have been proposed to calculate the adhesion force that can affect the flowability of the fine particles [19][20][21][22][23]. Those models were simplified models, only dealing with the adhesion between two particles with a single small particle in between.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Calculational Study on Effects of Flow Additive on Flowability of Fine Coating Particles

et al. 2022

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A method of encapsulation of inorganic additives with organic materials was developed to improve the fine power flowability and film quality for powder coating. The flowability tests angle of repose (AOR) and avalanche angle (AVA) were conducted for the coating samples to characterize the effectiveness of the encapsulated additives on group C fine powder flowability. The results show that both AOR and AVA are significantly affected by the encapsulating materials, the encapsulating material weight percentage, as well as the total loading ratios of additives added in fine powders. Polyester shows the best performance on the modification of the additive due to the high similarity to host powder coating. AOR/AVA first decreases and then decreases with the encapsulating material weight. An optimum percentage exists at approximately 10%. A similar trend is observed with the additive loading ratio, and the minimal AOR/AVA is obtained at additive loading ratios between 0.5% and 0.8%. The effective surface area coefficient (η) was introduced to improve the adhesion force model to determine the optimum additive loading ratio for various host particle and additive particle sizes, which agrees well with the experimental results.

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Gas-solid reaction induced particle collision and aggregation

Liu

Shen

Zhou

et al. 2022

Combustion and Flame

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Spherical volume elements scheme for calculating van der Waals force between irregular particles and rough surfaces

Cited by 5 publications

References 29 publications

Dynamic Simulation and Parameter Analysis of Contact Mechanics for Mimicking Geckos’ Foot Setae Array

Dynamic Simulation and Parameter Analysis of Contact Mechanics for Mimicking Geckos’ Foot Setae Array

Experimental and Calculational Study on Effects of Flow Additive on Flowability of Fine Coating Particles

Gas-solid reaction induced particle collision and aggregation

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