Article
Mechanics
Mohit P. Dalwadi, Radu Cimpeanu, Hilary Ockendon, John Ockendon, Tom Mullin
Summary: Experiments have shown that a horizontal cylinder placed on a vertically moving belt coated with viscous fluid can levitate at a fixed height and rotate around its own axis at a specific belt velocity. By developing a model and utilizing a combination of asymptotic analysis and direct numerical simulation, researchers have successfully established a relationship between the belt speed and cylinder rotation rate, which has been validated against experimental results.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Applied
Riku Kobayashi, Toshihide Nabatame, Takashi Onaya, Akihiko Ohi, Naoki Ikeda, Takahiro Nagata, Kazuhito Tsukagoshi, Atsushi Ogura
Summary: In this study, the characteristics of carbon-doped indium oxide thin-film transistors were investigated by varying the O-2 concentration, revealing that the magnitude and direction of bias stress play a crucial role in the positive threshold voltage shift, regardless of the O-2 concentration.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Mechanics
Anthony Peirce, Emmanuel Detournay
Summary: This paper discusses the construction of tip asymptotes for a hydraulic fracture in a permeable elastic medium. It describes the changing nature of the asymptotic fields during the arrest and recession phases of the fracture after fluid injection has ended. The paper shows that as the fracture deflates, the dominance of the linear elastic fracture mechanics tip asymptote shrinks, giving way to an intermediate asymptote. The front velocity affects the development of a linear asymptote at the fracture tip, with the intermediate asymptote reappearing. These universal multiscale asymptotes are crucial for determining the decaying stress intensity factor, transition from arrest to recession, and front velocity during recession using computational algorithms.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Zhi-Qiao Wang, Emmanuel Detournay
Summary: This paper investigates the motion of a liquid blister trapped between an elastic sheet and a rigid substrate, driven by a frictionless blade. The study aims to evaluate the force applied by the blade on the moving blister, with solutions depending on two controlling numbers. The results show that for small gaps, the force is dominated by viscous dissipation, while for larger gaps, the force depends on both toughness and gap size.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Multidisciplinary Sciences
Asghar Shirani, Yuzhe Li, Osman Levent Eryilmaz, Diana Berman
Summary: The study reveals the anti-wear capability of metal nitride-copper nanocomposite coatings in liquid hydrocarbon environments. The formation of carbon-based protective films at the sliding interface contributes to the significant reduction of wear. Analysis of tribological characteristics under different conditions provides insights into the tribocatalysis mechanism facilitating the formation of zero-wear coatings.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Multidisciplinary
Zhi-Qiao Wang, Emmanuel Detournay
Summary: This paper investigates the dynamics of a liquid blister forced to advance between a thin elastic sheet and a rigid substrate by the dual action of a piston and a flat frictionless sleeve. The study focuses on the dependence of external driving force on blister velocity, fluid viscosity, elastic properties of the sheet, and interface toughness, with a particular emphasis on the Eshelbian nature of the horizontal driving force. The numerical and asymptotic solutions predict the scaled horizontal force on the moving liquid blister and highlight the importance of three key numbers in controlling the solution.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Hirotoshi Yamada, Naoki Morimoto, Hyosuke Mukohara, Tomonori Tojo, Sei-ichi Yano, Eisuke Magome, Takao Morimura, Raman Bekarevich, Kazutaka Mitsuishi
Summary: This study reveals the high moisture sensitivity of LATP conductivity, resulting in its unusual ionic conduction behavior. Moisture enhances grain boundary conductivity, affecting battery performance.
JOURNAL OF POWER SOURCES
(2021)
Article
Engineering, Mechanical
S. Boedo
Summary: This study investigates the impact of surface ellipticity on self-acting partial arc journal bearings under steady load and sinusoidal oscillation, taking into account mass conserving cavitation. The computational efficiency is improved by using a generalized Warner bearing (GWB) formula. The results demonstrate that an elliptical sleeve can significantly improve bearing performance at small oscillation amplitudes commonly found in practical applications, and a fully hydrodynamic lubrication regime can be established through the wearing-in process of the sleeve surface.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Lei Yang, Shaoshan Xin, Jiang Geng, Meiling Guo
Summary: Carbon films with different nanostructures were prepared and micro-textures were introduced on the surface to investigate their tribological properties. The results show that carbon films with specific nanostructures exhibit lower friction coefficients and longer wear life under water lubrication. Amorphous carbon (a-C) films outperform graphene sheet-embedded carbon (GSEC) films due to their low surface roughness, high hardness, and compact structure. The introduced surface texture has a negative effect on a-C film but enhances the wear life of GSEC film by forming a silt-like transfer film. These findings contribute to the understanding of carbon film's tribological behavior in water lubrication.
Article
Materials Science, Multidisciplinary
Sangbin Park, Younghwa Yoon, Sehyun Lee, Taejun Park, Kyunghwan Kim, Jeongsoo Hong
Summary: In this research, hydrophilic surfaces of TiO2 thin film were successfully obtained through thermoinduced and photoinduced methods to reduce the water contact angle, and it was found that crystallinity influences the hydrophilicity and sustainability of the films under sunlight.
Article
Engineering, Mechanical
Yanfei Fang, Hui Xuan, Haoling Ren, Shengjie Fu, Tianliang Lin
Summary: Revealing the interface effect on lubrication is important for designing high performance water-based lubricating friction pairs. A new thin film lubrication numerical model considering the electrical double layer (EDL) effect with an imperfect coating in point contact is proposed and verified. The model shows that the EDL effect can improve the firm formation of lubricated film, while the imperfectly bonded interface and coating thickness affect the von Mises stress.
Article
Engineering, Chemical
Ruizhang Xu, Feng Gao, Yunqi Wu, Lei Ding, Dandan Chen, Tianyu Liu, Yansong Yu, Weiling Zhuo, Zhouyun Chen, Yunchu Zhang, Yiying Sun, Feng Yang, Jinyao Chen, Ya Cao, Jian Kang, Zhuo Zheng, Ming Xiang
Summary: When using support layers with similar surface pore sizes, the hydrophilic support layer can promote the diffusion of aqueous monomers into the organic phase, but is not advantageous for the performance of the polyamide composite membrane.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
Daohui Xiang, Zhiqiang Zhang, Yanbin Chen, Yongwei Hu, Xiaofei Lei
Summary: The study indicates that boron doping can enhance the quality of diamond films, while texture contributes to improved adhesion strength. Under water lubrication, boron-doped grooved textured diamond films exhibit the best wear resistance among the tested samples.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Shengwei Zhang, Zhijun Yan, Ze Liu, Yuanyuan Jiang, Haocheng Sun, Shibo Wu
Summary: A boundary film strength model was proposed to analyze the influence of boundary film on the lubrication state of sliding friction pairs. The model parameters were obtained through fitting the test results. A mixed lubrication model considering boundary film strength was established by coupling the boundary film strength model with other lubrication models. The study of mixed lubrication considering boundary film strength provides theoretical guidance for improving the mechanical energy efficiency of friction pairs.
Article
Engineering, Environmental
Baisong Zhao, Yan-Pu Li, Qingning Wang, Yue Ren, Zi-Li Zheng, Meng-Han Bai, Jia-Cheng Lv, Ka Li, Jia-Zhuang Xu, Zhong-Ming Li, Xingrong Song
Summary: A highly lubricated coating was applied to tracheal tubes to reduce friction-related injuries during endotracheal intubation, providing excellent lubrication through the formation of a hydration layer on the tube surface. In vivo studies on cynomolgus monkeys demonstrated the effectiveness of the coating in alleviating injuries caused by endotracheal intubation.
CHEMICAL ENGINEERING JOURNAL
(2022)
