Article
Thermodynamics
Xue Li, Brandon Murray, Shankar Narayan
Summary: In this study, the evaporation process of water droplets on a thin quartz substrate is analyzed using a numerical model. The model considers mass and heat transfer, as well as interfacial force balance, and agrees well with experimental results. The study highlights the importance of surface wettability in evaporation dynamics.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Saravanan Balusamy, Sayak Banerjee, Kirti Chandra Sahu
Summary: The spreading of respiratory diseases like COVID-19 from contaminated surfaces is largely influenced by the drying time of virus-containing droplets, which is affected by environmental conditions and physical properties. Respiratory droplets contain salt, protein, and surfactant in addition to water, which are expected to impact evaporation significantly.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
Adnan Khan, Shi-Ting Zhang, Qian-Ping Li, Hao Zhang, Yu-Qiao Wang, Xiao-Dong Niu
Summary: This study introduces a novel numerical representation of a permanent magnet, which overcomes previous limitations and allows for introducing a magnetic field of desired strength at any location. By simulating benchmark phenomena and investigating the influence of magnetic fields on droplet spreading, the validity of the proposed method is demonstrated.
Article
Thermodynamics
Shangpei Dai, Xuhong Jia, Xiaoyu Zhang, Jing Tang, Junhao Ma, Quanyi Liu, Yulong Zhu
Summary: This study experimentally investigated the evaporation behavior of different fuel droplets on hot surfaces, revealing various thermal patterns and heat transfer mechanisms. The results showed that the evaporation rate of droplets is largely determined by the saturation vapor pressure.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
Shilpi Chatterjee, Abhiram Hens, Kartik Chandra Ghanta, Gautam Biswas
Summary: The study shows that external electric field and surface temperature significantly affect the dynamics of ionic nanodroplets on a solid surface. Hydration effects resist droplet deformation, while a vertical electric field can lead to the formation of nanobridge/column structures.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Mechanics
Arnov Paul, Purbarun Dhar
Summary: This article reports on the analysis of evaporation kinetics of sessile droplets on generic curved surfaces, showing how the nature and magnitude of curvature influence evaporation behavior. Experimental validation of the analytical model indicates that on convex surfaces, evaporation rates increase due to augmented vapor diffusion domain, while on concave surfaces rates decrease due to droplet confinement. The model also addresses the fact that on concave surfaces, evaporation rate is not directly governed by substrate curvature, contrary to previous literature discussions.
Article
Engineering, Chemical
Du Tuan Tran, Nhat-Khuong Nguyen, Pradip Singha, Nam-Trung Nguyen, Chin Hong Ooi
Summary: A simple and easy-to-use elliptic model approach is proposed in this study to generate theoretical droplet profiles and determine critical parameters with only three specific points needed. Fitting coefficients are introduced to accurately determine the contact angle and surface tension of a droplet. Results show that this method is in excellent agreement with the Young-Laplace equation and can accurately approximate liquid droplet profiles.
Article
Chemistry, Physical
Binita Pathak, John Christy
Summary: A colloidal droplet is important in spray-drying applications and understanding the dynamics involved is crucial for controlling the final structures obtained. By studying the protein concentration in milk droplets, we found that capillary forces and inter-particle interaction dominate the particle deposition. Buckling instability and cavitated structures can occur when the protein concentration exceeds a certain threshold. Maintaining hydrophobicity is important for initiating buckling instability. Our study provides physical insights into the dynamics of desiccating droplets and has implications for spray-based industries.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Mechanics
Truong V. Vu, Binh D. Pham, Nang X. Ho, Hung V. Vu
Summary: This study presents a numerical analysis of the solidification process of a forced convection droplet on a cooling surface. The study found that an increase in the temperature of the forced flow leads to slower solidification, while increasing the flow strength shortens the solidification process. Other parameters such as the capillary number and droplet morphology also affect the solidification process.
Article
Chemistry, Physical
Bo Hou, Chunya Wu, Xiguang Li, Junjie Huang, Mingjun Chen
Summary: This study analyzed the forces and critical conditions on static sessile droplets deposited on hydrophobic micropillar-structured surfaces, proposing a new force-balance model which showed better agreement with experimental results compared to classical models. Integration of depinning mechanisms into the model allows for reliable estimations of critical conditions for the C-W transition during evaporation, providing appropriate geometric parameters for achieving high hydrophobic stability.
APPLIED SURFACE SCIENCE
(2021)
Review
Mechanics
Stephen K. Wilson, Hannah-May D'Ambrosio
Summary: The evaporation of a sessile droplet of liquid is a complex and multifaceted fundamental topic. It has drawn significant multidisciplinary research efforts in recent decades due to its key role in numerous physical and biological processes. This review focuses on the insights gained from simple mathematical models and discusses potential future directions in the field.
ANNUAL REVIEW OF FLUID MECHANICS
(2023)
Article
Mechanics
Zhaoyuan Meng, Yubing Zhu, Jiguang Hao, Gengkai Hu, J. M. Floryan
Summary: This study investigates the residual diameter of a droplet impacting a cold surface at a low temperature using high-speed photography. It is found that below a certain threshold temperature, the droplet freezes near its maximum spreading diameter, creating a pancake shape. However, above the threshold temperature, the droplet retracts before freezing. The threshold temperature decreases with increasing Weber number.
Article
Thermodynamics
Hatim Machrafi, Pierre Dauby
Summary: This study develops a comprehensive axisymmetric transient model to describe the injection and evaporation process of a sessile droplet. The model is validated against experimental data in both Earth and microgravity conditions. It is found that the injected volume affects the evaporation rate, but its influence is weaker under microgravity conditions compared to Earth conditions. It is also revealed that uncertainties involving the injection are not an obstacle to model the evaporation of sessile droplets in most cases.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Mengying Fan, Fengyun Duan, Tianqi Wang, Mingming Kang, Bin Zeng, Jian Xu, Ryan Anderson, Wei Du, Lifeng Zhang
Summary: This study used computational fluid dynamics to investigate the impact of gas diffusion layer pore shape and distance between pores on water droplet growth and coalescence in proton exchange membrane fuel cells.
Article
Chemistry, Physical
Minhyeok Kuk, Jeongsu Pyeon, Hyoungsoo Kim
Summary: Our study demonstrates that the evaporation flux is primarily influenced by the geometry and composition of the droplet under diffusion-limited conditions. Previous research has mainly focused on the evaporation from liquid to gas phase, neglecting the impact of evaporated vapors on the process. We hypothesize that vapor with significantly different molecular weight from the ambient gas can alter the evaporation flux.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Polymer Science
Christian Narvaez-Munoz, Pavel Ryzhakov, Jordi Pons-Prats
Summary: This study aims to determine the optimal operating parameters for the fabrication of well-shaped PVP particles through a combination of experimental and numerical approaches, with a focus on the role of PVP solution viscosity. The established scaling law approximates the optimal combination of parameters, ensuring the formation of spherical particles within a stability island. Particle size prediction as a function of flow rate is demonstrated through power scaling relationships within the optimal parameters range.
Article
Mechanics
Elaf Mahrous, R. Valery Roy, Alex Jarauta, Marc Secanell
Summary: This study presents a numerical model based on the particle finite element method for predicting the sliding motion of liquid drops on surfaces. The inclusion of the retention force effect near the drop's contact line is found to be essential for obtaining realistic spatiotemporal evolution of the drop. The proposed model, validated using experimental data, shows mesh-independent numerical results that are in good agreement with experiments.
Article
Mathematics, Applied
P. B. Ryzhakov, J. Marti, N. Dialami
Summary: A finite element-based model for analyzing incompressible flows in flexible channels is presented in this work. The model treats the fluid-solid interaction problem in a monolithic way, using an arbitrary Lagrangian/Eulerian framework. The governing equations for both sub-domains are solved on a single moving grid, with the mesh-moving strategy and the constitutive equation coefficients as the distinguishing factors. The unified formulation of the governing equations and the use of a semi-Lagrangian interface mesh-motion algorithm result in a coupled problem formulated in terms of a unique kinematic variable. The model exhibits high convergence rates when used with an algebraic multigrid linear solver.
JOURNAL OF SCIENTIFIC COMPUTING
(2022)
Article
Engineering, Multidisciplinary
Mohammad R. Hashemi, Riccardo Rossi, Pavel B. Ryzhakov
Summary: In this paper, the BFECC methodology is used to improve solvers for the advection equation. The algorithm enforces a discrete maximum principle and improves accuracy by introducing controlled anti-diffusivity. The proposed methodology is assessed using benchmark tests on structured and unstructured meshes.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Marine
P. Ryzhakov, F. Hermosilla, P. -a. Ubach, E. Onate
Summary: Excessive erosion of sand beaches is a serious global issue, especially in the Mediterranean region. This study investigates the feasibility of using inflatable structures to improve sediment transport control. A preliminary design is proposed and tested in various storm scenarios, showing promising results.
Article
Mechanics
Elaf Mahrous, R. Valery Roy, Alex Jarauta, Marc Secanell
Summary: This paper proposes a new three-dimensional droplet dynamics model and solves it numerically. The results are compared with experimental data and show that the model can accurately predict droplet spreading and sliding behavior.
Article
Chemistry, Multidisciplinary
Marti Coma, Navid Monshi Tousi, Jordi Pons-Prats, Gabriel Bugeda, Josep M. Bergada
Summary: This article introduces a hybrid optimization method that combines genetic algorithms and gradient-based methods to overcome their respective drawbacks. The hybrid method outperforms the individual methods in terms of convergence speed and robustness on an optimization problem.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Riccardo Tosi, Marc Nunez, Jordi Pons-Prats, Javier Principe, Riccardo Rossi
Summary: This work focuses on reducing the computation time for statistical estimators of chaotic incompressible flows by using parallelization and applying convergence criteria. The error analysis identifies initialization bias and statistical error and proposes methods to minimize them. The method is evaluated in predicting the drag force on high rise buildings and specifically applied to the CAARC building.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Economics
Jordi Pons-Prats, Tanja Zivojinovic, Jovana Kuljanin
Summary: This paper provides an in-depth qualitative analysis of relevant aspects of UAM development and implementation, focusing on assessing the current status and prospects of the most important UAM areas. It also discusses the main challenges and multidisciplinary constraints towards the successful application of this concept.
TRANSPORTATION RESEARCH PART E-LOGISTICS AND TRANSPORTATION REVIEW
(2022)
Article
Polymer Science
Christian Narvaez-Munoz, Camilo Zamora-Ledezma, Pavel Ryzhakov, Jordi Pons-Prats, Jeevithan Elango, Carlos Mena, Freddy Navarrete, Victor Morales-Florez, Rafael Cano-Crespo, Luis Javier Segura
Summary: This work presents an original procedure for manufacturing glass-fiber epoxy reinforced nanocomposites with improved mechanical properties and reduced roughness. The results suggest that these nanocomposites would be suitable for use in the aeronautics and automotive industries.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Mechanics
Christian Narvaez-Munoz, Mohammad R. Hashemi, Pavel B. Ryzhakov, Jordi Pons-Prats
Summary: In this work, a numerical model for simulating two-phase electrohydrodynamic (EHD) problems with accurate representation of surface tension and jump in electric material properties is proposed. The model uses a finite element method with special shape functions to capture discontinuities in fluid pressure and electric potential gradient. The phase interface is treated as a zero-thickness boundary, allowing the electric force to be modeled as an interfacial force. The proposed methodology is tested and shown to be applicable to non-symmetric three-dimensional cases, providing a basis for enriched finite element methods for a wide range of EHD problems.
Article
Mathematics
Xavier Martinez, Jordi Pons-Prats, Francesc Turon, Marti Coma, Lucia Gratiela Barbu, Gabriel Bugeda
Summary: Composite materials are extensively used in transport structures for their weight reduction advantages and flexibility in adapting to application requirements. Numerical models and tools for predicting performance are crucial in designing efficient structures. The authors propose a multi-objective, multi-scale optimization procedure for optimal structure and material design. This approach is applied to an aircraft overhead locker made with bio-based sandwich laminate. By coupling a genetic algorithm with a structural multi-scale numerical model, optimal designs are obtained for single-objective and multi-objective optimization cases. The results highlight the importance of considering both macro-structural and micro-structural configurations for achieving optimal composite structures.
Article
Computer Science, Hardware & Architecture
Jacob Cortes, Dario Di Martino, David Duran, Josep Lopez, Jordi Pons-Prats, Jesus Sanchez
Summary: This article introduces several improvements to two specific fault tree analysis methods, aiming to enhance computational performance. The results show that both methods have been highly optimized and a new DE solution has been achieved, which can compete with the MCS approach in terms of time resources and precision.
IEEE TRANSACTIONS ON RELIABILITY
(2023)
Editorial Material
Engineering, Marine
Pavel B. Ryzhakov, Julio Marti, Mohammad R. Hashemi
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
