Article
Mechanics
Dongxing Tang, Guo Xiang, Juan Guo, Jianlin Cai, Tianyou Yang, Jiaxu Wang, Yanfeng Han
Summary: In this study, a structural optimization method driven by tribo-dynamic mechanism is proposed for staved water-lubricated bearings. A tribo-dynamic model considering mass conservation cavitation is established and verified through comparison with experimental and numerical results. Numerical simulations identify the optimal stave structure for a specific working operation under heavy load condition, and the influences of key parameters on the optimization results are analyzed. The effects of stave parameters on tribo-dynamic characteristics of SWLBs are also investigated.
Review
Engineering, Multidisciplinary
Haoxuan Zheng, Ying Zheng, Jesse Zhu
Summary: Hydrodynamic cavitation is a promising technology for process intensification, with high energy efficiency, cost-effective operation, ability to induce chemical reactions, and scale-up possibilities. This article provides an extensive review of the fundamentals, design, and applications of hydrodynamic cavitation, including a comparison of stationary and rotational reactors, discussion of design parameters and reactor performance, and evaluation of commercial cavitation reactors. The unique features of hydrodynamic cavitation have been widely applied in various chemical reactions and physical processes, and the roles of radicals and gas bubble implosion are thoroughly discussed.
Article
Thermodynamics
ZhaoCheng Sun, Dong Li, YuFeng Mao, Long Feng, Yue Zhang, Chao Liu
Summary: This paper presents a revised theoretical analysis of hydrodynamics optimization of horizontal-axis tidal turbines, including cavitation effects, based on improved inverse blade element momentum (BEM) theory. The cavitation prediction model and improved inverse BEM theory are combined, and a mathematical model of multi-objective optimization is established to verify the effectiveness of the proposed methodology. The simulation and experimental results revealed that the proposed design method achieves the optimization goal.
Article
Nanoscience & Nanotechnology
Farzad Rokhsar Talabazar, Mohammad Jafarpour, Merve Zuvin, Hongjian Chen, Moein Talebian Gevari, Luis Guillermo Villanueva, Dmitry Grishenkov, Ali Kosar, Morteza Ghorbani
Summary: A new 'cavitation-on-a-chip' device is proposed in this study to reduce the upstream pressure required for hydrodynamic cavitation, with further pressure reduction achieved by using poly(vinyl alcohol) microbubble suspension. Different cavitating flow patterns with various intensities can be observed within the same device, and cavitating flows intensify faster in the proposed device compared to previous studies. This next-generation device has high potential for applications in microfluidic/organ-on-a-chip devices, such as integrated drug release and tissue engineering.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Mathematics, Applied
Lorena Bociu, Sarah Strikwerda
Summary: This paper addresses optimal control problems subject to fluid flows through deformable, porous media, focusing on linear quadratic elliptic-parabolic control problems and proving existence and uniqueness of optimal control. It also derives first order necessary optimality conditions and has important biological and biomechanical applications, such as modeling the lamina cribrosa in the eye and its relation to ocular neurodegenerative diseases like glaucoma. The study and results are also applicable to poroelastic modeling of cartilages, bones, and engineered tissues.
APPLICABLE ANALYSIS
(2022)
Article
Acoustics
Zahra Abbas-Shiroodi, Mohammad-Taghi Sadeghi, Soroush Baradaran
Summary: This work aims to design and optimize a cavitating device based on hydrodynamic cavitation using CFD simulation and experimental approaches. The results show that the designed Venturi can achieve maximum cavitation zone and highest decolorization rate under optimal geometrical configuration.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Physics, Fluids & Plasmas
Yadong Zhang, Ao Zhou, Xiong Lin, Kaixiang Li, Zhiqiang Sun
Summary: In this article, an electromagnetic coil catapult for water rescue is designed and developed. The single-stage coil launcher scheme is adopted to save costs and improve reliability. Two launch modes, armature-load integrated launch (ALIL) and armature-load separated launch (ALSL), are compared and it is found that ALSL mode improves the muzzle speed and allows for armature recovery and reuse.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Haobo Cao, Guoliang Hou, Zhiqiang Fu, Junkai Ma, Yulong An, Huidi Zhou, Jianmin Chen
Summary: An anti-cavitation erosion (CE) coating with single face-centered cubic (FCC) structure was designed to absorb both mechanical impact energy and thermal energy released by bubble collapse, effectively avoiding excessive crystal defects and exhibiting a CE resistance 2 times better than the classical coating.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zilin Ran, Wenxing Ma, Chunbao Liu
Summary: The study focuses on suppressing stator cavitation in hydrodynamic torque converters (HTCs) through slotting methods. The results show that wider slots can reduce cavitation risk but decrease hydrodynamic performance, while slotting one side of the suction side completely suppresses stator cavitation.
APPLIED SCIENCES-BASEL
(2022)
Article
Nanoscience & Nanotechnology
Wei Zhang, Wei Jiang, Chao Zhang, Xuezhi Qin, Huanxi Zheng, Wanghuai Xu, Miaomiao Cui, Bin Wang, Jianing Wu, Zuankai Wang
Summary: This study reports a previously unexplored solid repellency on a honeybee's comb and describes its mechanism. It demonstrates that the comb's stiffness gradient allows for the immediate ejection of particles, offering potential applications in the development of bioinspired stiffness-gradient materials and catapult-based actuators.
NATURE NANOTECHNOLOGY
(2023)
Article
Mathematics, Applied
Arbaz Khan, Pietro Zanotti
Summary: This article investigates the system of partial differential equations derived from the time discretization of the two-field formulation of Biot's model using the backward Euler scheme. The authors address the robustness issue in the discretization process by observing the problem's uniform stability in a suitable nonsymmetric variational setting. They propose a novel nonconforming discretization utilizing Crouzeix-Raviart and discontinuous elements and prove its quasi-optimality and robustness in a parameter-dependent norm.
MATHEMATICS OF COMPUTATION
(2022)
Article
Engineering, Marine
Hu Qixiang, Yang Yang, Shi Weidong, Cao Weidong, Shi Yansheng
Summary: The study found that under overload conditions of a centrifugal pump, vapor is likely to first emerge from the tongue of the volute rather than at the leading edge of the blades, resulting in different flow distribution in each passage. The minimum flow rate appears in the upstream channel, and cavitation at the tongue compresses the flow area, causing a significant increase in flow rate at the impeller outlet.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Andrew Akerson, Blaise Bourdin, Kaushik Bhattacharya
Summary: With recent advances in responsive materials and fabrication techniques, integrated functional structures composed of structural and active materials can now be constructed. This study investigates the robust design of such structures through topology optimization, exploring different objective functions and their resulting designs.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Engineering, Geological
Shogo Hirota, Tomochika Tokunaga
Summary: Mudstones are found to act as semipermeable membranes that induce osmotic flow and pressure changes, resulting in deformation. A numerical model was developed to describe these coupled processes by considering the nonlinear concentration-dependent semipermeable membrane properties. The model was applied to laboratory-scale experiments and successfully explained the deformation behavior.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Mechanical
Said Sobhi, Mohamed El Khlifi, Mohamed Nabhani
Summary: The study investigates the effects of cavitation and couple stress on the squeeze film behavior between an anisotropic poroelastic rigid disc and a sinusoidally oscillating rigid disc. The non-Newtonian Reynolds equation coupled with modified Darcy's law is derived based on the microcontinuum theory and numerical algorithm. The results show that couple stress, oscillating amplitude, percolation additives, permeability and anisotropic permeability have significant effects on the squeeze film characteristics. The findings of this study have practical implications in the design of bearings, wet clutches, and non-contact mechanical seals.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Musaddaq Azeem, Adrien Guerin, Thomas Dumais, Luis Caminos, Raymond E. Goldstein, Adriana I. Pesci, Juan de Dios Rivera, Maria Josefina Torres, Jakub Wiener, Jose Luis Campos, Jacques Dumais
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Physical
Simon Gravelle, Jacques Dumais
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Multidisciplinary Sciences
Pascal S. Raux, Simon Gravelle, Jacques Dumais
NATURE COMMUNICATIONS
(2020)
Article
Engineering, Mechanical
Jesus Sanchez-Rodriguez, Christophe Raufaste, Mederic Argentina
JOURNAL OF FLUIDS AND STRUCTURES
(2020)
Article
Physics, Applied
Franck Celestini, Joachim Mathiesen, Mederic Argentina, Christophe Raufaste
PHYSICAL REVIEW APPLIED
(2020)
Article
Mechanics
N. O. Rojas
Summary: The research shows that when a newborn breathes for the first time, a peeling bubble of air is generated along with a series of complex physical processes, including changes in bubble speed and the formation of interface wavenumbers.
Article
Physics, Fluids & Plasmas
David Gross, Yann Roux, Christophe Raufaste, Argentina Mederic
Summary: This article examines the importance of vortex-induced drag on propulsion in fish swimming, showing that in the turbulent regime, the combination of pressure and vortex-induced drags sets the Strouhal number between 0.2 and 0.4, while in the laminar regime, vortex-induced drag can be neglected in most cases. If not, a significant amplification of the drag force is needed to match biological data for a two-dimensional swimmer.
PHYSICAL REVIEW FLUIDS
(2021)
Review
Plant Sciences
Jacques Dumais
Summary: All kingdoms of life have evolved tip-growing cells that are able to mine their environment or deliver cargo to remote targets. The interactions between wall mechanics and cell hydraulics are complex and require quantitative models to understand. Turgor pressure, a central variable in the morphogenetic process, has been a controversial topic for over 50 years.
Article
Physics, Multidisciplinary
J. Sanchez-Rodriguez, F. Celestini, C. Raufaste, M. Argentina
Summary: In this study, a new approach for driving bioinspired fish swimming locomotion is proposed. Utilizing proprioceptive sensing information, control of body position, motion, and acceleration is achieved through a feedback loop. Experimental results demonstrate that the instability generated by this mechanism can drive swimming locomotion effectively.
PHYSICAL REVIEW LETTERS
(2021)
Review
Biochemistry & Molecular Biology
Denis Doyen, Mallorie Poet, Gisele Jarretou, Didier F. Pisani, Michel Tauc, Marc Cougnon, Mederic Argentina, Yann Bouret, Laurent Counillon
Summary: The article discusses the importance of intracellular pH and the molecular mechanisms that affect and regulate it. Through mathematical modeling, the cellular response to acidification, the impact of different transporters and intracellular buffering are explored. The article highlights the significance of modeling in studying biological questions such as functional redundancy and natural selection.
FRONTIERS IN MOLECULAR BIOSCIENCES
(2022)
Article
Education, Scientific Disciplines
Christophe D'Angelo, Laurence Viennot, Mederic Argentina, Franck Celestini, Christophe Raufaste
Summary: This article aims to explore how to facilitate the understanding of collision processes among university students. Firstly, the results of a questionnaire show that students' understanding of the dissipation of kinetic energy is poor. Secondly, a simple model is used to contextualize the rebound of inhomogeneous projectiles. Finally, recent research on bilayered projectiles is utilized to emphasize the influence of body structure on the restitution of kinetic energy after rebound.
EUROPEAN JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Sardor Israilov, Li Fu, Jesus Sanchez-Rodriguez, Franco Fusco, Guillaume Allibert, Christophe Raufaste, Mederic Argentina
Summary: Machine learning is a new paradigm in control theory, but often lacks intuition compared to classical model-based methods, especially for reinforcement learning. In this article, a general framework is proposed to reproduce successful experiments and simulations using the inverted pendulum as a benchmark. Two algorithms, basic Q-Learning and Deep Q-Networks (DQN), are introduced to provide a comprehensive understanding of the approach and its implementation on real systems.
Article
Multidisciplinary Sciences
Jesus Sanchez-Rodriguez, Christophe Raufaste, Mederic Argentina
Summary: In this article, scaling laws for undulatory swimmers are proposed, relating beat frequency to length considering muscle biology and fluid interaction. The results support the idea that frequency tuning is the primary means by which a swimmer selects its speed, and highlight the influence of size on frequency regulation.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Fluids & Plasmas
Guillaume Giombini, Joachim Mathiesen, Christophe D'Angelo, Mederic Argentina, Christophe Raufaste, Franck Celestini
Summary: Elasticity can be used to accelerate objects and improve mechanical energy transfer efficiency by tuning the properties of elastic elements. Adding a soft layer matched to the ejection frequency of a rigid projectile can significantly enhance throwing efficiency.
Article
Physics, Fluids & Plasmas
Christophe D'Angelo, Laurence Viennot, Mederic Argentina, Franck Celestini, Christophe Raufaste
Summary: This study investigates the coefficient of restitution of composite objects and finds that for rather elastic materials, this coefficient is not a simple function of mass ratio and exhibits significant variations. The impact dynamics can be characterized by the ratios of four timescales, including the contact duration and elastic wave propagation in the soft layer. Describing these projectiles requires consideration of both Hertzian theory of contact and elastic waves described by Saint-Venant's approach.