Article
Mechanics
Akhil Varma, Anubhab Roy, Baburaj A. Puthenveettil
Summary: In the wetting or dewetting of a solid substrate by a liquid, the dynamics of the contact line motion are governed by the local Reynolds number rho, which determines whether the flow is dominated by viscous forces or inertia. Traditional contact line models assuming Stokes flow and neglecting inertia may be inaccurate in describing hydrodynamic flow fields, particularly at higher speeds or further distances from the contact line. Incorporating inertia through regular perturbation expansion near the Stokes solution can result in singularity-free, inertia-corrected flow functions that deviate significantly from Stokes solution in the visco-inertial regime. Although inertia has a considerable effect on hydrodynamic flow fields, it appears to have little to no influence on dynamic contact angles.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
Kimberly A. Bernetski, Hee Tae An, Kara L. Maki, Michael J. Schertzer
Summary: Characterizing the electrowetting force by its rms value allows for more accurate prediction of advancing contact angles and reduction of contact angle hysteresis in AC electrowetting.
MICROFLUIDICS AND NANOFLUIDICS
(2022)
Article
Chemistry, Multidisciplinary
Jinhong Yang, Quanzi Yuan
Summary: This paper presents a new type of instability called the pagoda instability (PI) that occurs when inserting a soluble fiber into a liquid. The coupling of dissolution and wetting leads to special phenomena and the final shapes of the fibers are summarized using a phase diagram. The use of optimized fibers can reduce the influence of capillary force during atomic force microscopy measurements in humid environments by 70%.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Mechanics
M. Elena Diaz, Ramon L. Cerro
Summary: The theoretical model of a moving contact line for a dewetting flow takes into account the effect of molecular forces and combines streamline functions in molecular and macroscopic domains to resolve a hydrodynamic paradox caused by a purely viscous model.
Article
Energy & Fuels
Jiancai Zheng, Nina Wang, Decheng Wan, Sergei Strijhak
Summary: With the economic considerations, wind turbine blades are becoming longer and more flexible, necessitating research on the influence of aerodynamic and elastic structure coupling. The coupled aeroelastic performance of wind turbine blades was analyzed using the elastic actuator line model and the Euler-Bernoulli beam theory. The findings showed that considering blade deformations decreased aerodynamic power and thrust, with the interference effect on thrust being more pronounced. The far wake region was also affected, causing a delay in the tip vortex interference phenomenon.
Article
Chemistry, Physical
Pablo F. Ibanez-Ibanez, Francisco J. Montes Ruiz-Cabello, Miguel A. Cabrerizo-Vilchez, Miguel A. Rodriguez-Valverde
Summary: The study demonstrates that the characterization of contact angle hysteresis on soft surfaces is sensitive to the measurement protocol and may have adventitious time-dependencies. The slow spontaneous relaxation of water drops on elastic surfaces may affect the observed values of contact angle hysteresis. The wetting properties of elastic surfaces should be properly examined with reliable values of contact angle measured after drop relaxation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Biology
Jane S. MacDonald, Yves Bourgault, Frithjof Lutscher
Summary: The study presented a mathematical tool to investigate population dynamics within moving habitats and distinguish populations at high and low risk of extinction. The model considered factors such as shifting speeds, habitat preference, and revealed mechanisms supporting population persistence at different speeds.
MATHEMATICAL BIOSCIENCES
(2021)
Article
Engineering, Marine
Hao Tang, Zhao-Li Tian, Xin-Yang Ju, Ji-Tuan Feng, Yun-Long Liu, A-Man Zhang
Summary: This study investigates the transient fluid dynamics of explosions near a free surface through experiments and numerical simulations. The problem is classified into cavities and bubbles based on whether the explosion is exposed to the air. Explosions above the free surface generate hemispherical cavities that evolve into W-shaped ones. The simulations reveal that the distance parameter dominates the bubble's bursting and that the explosive equivalent and distance parameter compete to determine the cavity's closure. In addition, the impact pressure characteristics generated by the explosion near the free surface are also analyzed.
Article
Engineering, Civil
Simona Di Nino
Summary: An in-plane finite element model of infilled frame systems is developed, focusing on the contact/separation conditions at the frame-infill interface. The model is validated through comparisons with experimental and numerical findings. Parametric analyses are conducted to determine interpolation formulae estimating frame-infill contact lengths and global stiffness in the elastic regime.
ENGINEERING STRUCTURES
(2022)
Article
Robotics
Andrew P. Sabelhaus, Rohan K. Mehta, Anthony T. Wertz, Carmel Majidi
Summary: This article presents a framework for detecting and modeling the actuator states of untethered soft robots. The framework includes compact and robust sensors and uses a neural network model to accurately predict the robot's motion.
FRONTIERS IN ROBOTICS AND AI
(2022)
Article
Engineering, Ocean
Haojie Zhang, Zhen Guo, Lizhong Wang, Shengjie Rui, Ronghua Zhu, Xunkui Zhang
Summary: This paper proposes a new numerical model for dynamically installed anchors (DIAs) with attached mooring lines, which can consider the forces acting on anchors and mooring lines. A total of 176 numerical simulations were conducted to analyze the anchor installation under different mooring line configurations, and the results showed that the presence of mooring lines significantly reduces the penetration depth of the anchor. The research findings provide guidance for a better understanding of the working principle of dynamically installed anchors.
APPLIED OCEAN RESEARCH
(2023)
Review
Energy & Fuels
PawelMadejski, Tomasz Kus, Piotr Michalak, Michal Karch, Navaneethan Subramanian
Summary: Direct contact heat exchangers are widely used in various fields due to their small size, low cost, and simple construction. This paper provides a comprehensive review of experimental and numerical studies on direct condensation processes and direct contact condensers at the laboratory scale.
Article
Engineering, Mechanical
Xiaodong He, Sen Wang, Zhiwei Zheng, Xiuchang Huang, Xinsheng Wei, Yong Wang, Hongxing Hua
Summary: This study investigated a damping strategy using a friction ring damper for an industrial flywheel through numerical and experimental analysis. The results showed that the friction ring damper effectively reduced the vibration amplitude of the flywheel. The analysis also revealed that the friction contact interface provided damping in the combined stick-slip state.
NONLINEAR DYNAMICS
(2023)
Article
Physics, Fluids & Plasmas
Haibo Zhao, Xing Han, Jiayu Li, Wei Li, Tao Huang, Peng Yu, Liqiu Wang
Summary: This study numerically investigates the oblique impact of a droplet on a horizontal solid surface. The impact velocity, both in magnitude and direction, is varied to analyze its effect on spreading area and droplet kinetics. It is found that the normal impact velocity is the main factor influencing the temporal variation of spreading area. The influence of the normal Weber number on the restitution coefficients is also examined, and it is observed that the tangential restitution coefficient varies around a constant value.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Engineering, Civil
Joseph Chilvers, Lei Yang, Xiaoshan Lin, Y. X. Zhang
Summary: This study experimentally and numerically evaluated the blast response of hybrid-fibre engineered cementitious composite (HFECC) panels for the first time, showing excellent blast resistance and potential application prospects.
ENGINEERING STRUCTURES
(2022)