Article
Physics, Applied
E. Ruiz-Gutierrez, P. J. Baker, A. M. J. Edwards, M. Newton, I. C. Sage, R. Ledesma-Aguilar, G. McHale, C. Brown
Summary: This study demonstrates the formation of thin, rectangular shaped films of electrically insulating liquid on curved and flexible liquid repellent substrates using dielectrophoresis forces. The experimental threshold voltage for film formation is found to have a monotonic dependence on the substrate curvature. By considering the balance of stresses acting on the films, the researchers develop an analytical theoretical expression that is in excellent quantitative agreement with the experimental measurements. The results and the demonstrated programmable wettability on curved and flexible substrates provide foundations for various applications such as imaging, displays, and biochemical analysis.
APPLIED PHYSICS LETTERS
(2022)
Article
Mechanics
M. Rank, A. Voigt
Summary: This study investigates the influence of varying Gaussian curvature on anomalous vortex-network active turbulence on general surfaces using a numerical approach for a covariant generalized Navier-Stokes equation. The simulation results indicate an alignment of vortex chains with minimal curvature lines of the surface and a dependency of this turbulence regime on the sign and gradient of local Gaussian curvature.
Article
Engineering, Aerospace
Hui Wu, Weifang Chen, Zhongzheng Jiang
Summary: The velocity slip and temperature jump for a two-dimensional rough plate under hypersonic conditions were analyzed using the DSMC method. The effects of relative roughness height on the slip coefficients were discussed, and a new slip model for rough surfaces was established. The modified slip model improves the accuracy of macroscopic properties, especially the heat transfer coefficient.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Physics, Multidisciplinary
Yinan Dong, Roya Zandi, Alex Travesset
Summary: This letter addresses the problem of characterizing the structure of an elastic network constrained to a frozen curved surface. It proposes a new approach based on nonlinear elasticity without using any approximation. The results show agreement with linear elasticity beyond its strict range of applicability. The implications for virus assembly are also discussed.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Dorsa Sadat Rabizadeh, Majid Abbasalizadeh
Summary: This study aims to investigate the acting mechanism of superhydrophobic surfaces and the factors affecting their performance and efficiency in a three-dimensional flow field. The hydrodynamic performance of a conventional microchannel is numerically assessed with smooth walls and superhydrophobic surfaces at different flow rates. The results show that superhydrophobic surfaces slightly increase the pressure drop in the microchannel, but the increase is not significant. The overall acting mechanism of superhydrophobic surfaces in microchannels is determined by factors such as vortices, periodicity of cavities, and pressure difference.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Kaiwen Li, Zhanpo Han, Lidan Wang, Jiaqing Wang, Chuanwei Zhang, Jiahao Lin, Shiyu Luo, Li Peng, Wenzhang Fang, Yingjun Liu, Ziliang Wu, Yeqiang Tang, Chao Gao, Zhen Xu
Summary: Assembling two-dimensional sheets into three-dimensional forms allows for the creation of materials with rich functionalities. In this study, the wrinkling behaviors of graphene oxide sheets on curved surfaces were investigated, revealing a selection rule for wrinkling modes based on the curvature mismatch between the sheets and target surfaces. This research provides a general and quantitative description framework for wrinkling modulation of 2D materials and has implications for precise fabrication of particles and functional coatings.
Article
Chemistry, Physical
Kaiwen Li, Zhanpo Han, Lidan Wang, Jiaqing Wang, Chuanwei Zhang, Jiahao Lin, Shiyu Luo, Li Peng, Wenzhang Fang, Yingjun Liu, Ziliang Wu, Yeqiang Tang, Chao Gao, Zhen Xu
Summary: Assembling two-dimensional sheets into three-dimensional structures is a promising material design method. This research investigates the wrinkling behaviors of graphene oxide sheets assembled onto curved surfaces, revealing the selection rule of wrinkling modes and providing a quantitative description method that can guide the precise fabrication of particles and functional coatings.
Article
Engineering, Mechanical
Pearson A. Wyder-Hodge, Egor Larionov, Dinesh K. Pai
Summary: The article proposes a method to estimate the orientation of a measured surface during friction measurements using a custom-made hand-held tribometer. The method takes into account the position and orientation of the tribometer relative to the shape of the surface, and allows for lightweight tribometers to be built with cheaper materials without sacrificing accuracy.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Physics, Applied
Chenwei Wei, Mengjia Cen, Hsiang-Chen Chui, Tun Cao
Summary: This study introduces a device based on TO technique that can control the propagation direction of surface waves by manipulating the refractive index, providing a new approach to manipulate surface wave propagation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Samuel Bell, Shao-Zhen Lin, Jean-Francois Rupprecht, Jacques Prost
Summary: Cell monolayers are important model systems in the study of tissue biophysics, and the role of curvature in monolayer motion is not well understood. This study presents a hydrodynamic theory for the motion of an apical-basal asymmetric active nematic gel on a curved surface, demonstrating that curvature can qualitatively change the flow pattern of the monolayer.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mathematics
Antonia Jabbour, Stephane Sabourau
Summary: We prove that every local supremum of the systole over the space of Riemannian metrics of curvature at most -1 on a given nonsimply connected closed surface is attained by a hyperbolic metric. As an application, we also present a partial extension of this result to 3-manifolds.
MATHEMATISCHE ANNALEN
(2023)
Article
Multidisciplinary Sciences
Zhaoguo Xue, Tianqi Jin, Shiwei Xu, Ke Bai, Qi He, Fan Zhang, Xu Cheng, Ziyao Ji, Wenbo Pang, Zhangming Shen, Honglie Song, Yumeng Shuai, Yihui Zhang
Summary: In this article, an ordered assembly strategy is introduced to transform 2D thin films into complex 3D structures on various curved surfaces using predefined mechanical loadings and prestretch techniques. The experimental results demonstrate the effectiveness of this method on different curved substrates, and the assembly structures can be accurately captured by mechanics modeling.
Article
Thermodynamics
M. K. Nayak, S. Shaw, Hassan Waqas, O. D. Makinde, Metib Alghamdi, Taseer Muhammad
Summary: This study discusses a comparative study on the three-dimensional Casson nanofluid with nonlinear radiative MHD flow and heat transfer aspects between two parallel stretching/shrinking surfaces. Mathematical models for momentum and temperature are established with nanoparticles distributed in Pure Water, and models like Maxwell-Garnett and Patel are used for thermal conductivity augmentation. Different parameters have varied effects on the heat transfer rate.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Ya-Wen Chang, Ricardo Cruz-Acuna, Michael Tennenbaum, Alexandros A. Fragkopoulos, Andres J. Garcia, Alberto Fernandez-Nieves
Summary: This study investigates the impact of out-of-plane curvature on cell proliferation and finds that proliferation is not dependent on curvature but rather on cell density. The study also introduces an imaging processing methodology for characterizing curved surfaces and quantifying cell proliferation.
FRONTIERS IN PHYSICS
(2022)
Article
Thermodynamics
Chuchen Yue, Qingwen Dai, Wei Huang, Xiaolei Wang
Summary: This study reports on droplets bouncing on curved surfaces with elevated temperatures, confirming the bouncing and depositing phenomena of different lubricant droplets. The influence of initial diameter, tangential velocity, and surface roughness on the impact dynamics of silicone oil droplets on wetted curved surfaces is investigated, with emphasis on the temperature dependence of the bouncing phenomenon. Bouncing and depositing thresholds under various conditions are summarized, with surface roughness having the most significant negative effect on the bounceable velocity range, followed by initial diameter and tangential velocity. A theoretical model and force analysis are established to explain the bouncing mechanism, while modified Bond numbers and Ohnesorge numbers are introduced to predict the bouncing thresholds. This work provides sufficient experimental and theoretical insights into manipulating droplets bouncing on wetted and curved surfaces with elevated temperatures.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
