Article
Astronomy & Astrophysics
T. Ohmura, K. Ono, H. Sakemi, Y. Tashima, R. Omae, M. Machida
Summary: The researchers proposed a new scenario in which the SS 433 jets themselves form the W50/SS 433 system. Through magnetohydrodynamics simulations, they found that when the propagating jet is lighter than the surrounding medium, the shocked plasma flows back from the jet tip to the core, resulting in a spherical morphology.
ASTROPHYSICAL JOURNAL
(2021)
Article
Mechanics
Xingyu Ma, Xuan Gong, Nan Jiang
Summary: We experimentally investigate the pulsating circular jet flow at moderate Reynolds numbers using time-resolved particle image velocimetry. The study shows that the pulsation effect modulates the entire potential core and the axisymmetric shear layer, forming larger-scale vortices with phase correlation. The pulsation increases turbulent mixing and extends fluid entrainment in the radial direction. Analysis of the dynamic modes reveals inhibition of low-frequency off-the-axis helical structures and strengthening of the axisymmetric jet column mode. Vortex formation mainly occurs during the deceleration phase, while a shock-like wave front is formed during acceleration.
Article
Biochemistry & Molecular Biology
Da Yeon Cheong, Wonseok Lee, Insu Park, Jinsung Park, Gyudo Lee
Summary: In this study, the nucleation and formation process of lysozyme amyloid fibrils were observed using a microfluidic system. It was found that the lag phase of amyloid nucleation and growth can be reduced by using smaller droplet volumes. Furthermore, a peculiar phenomenon of high amyloid formation at the edge of droplets was discovered, and it was observed that fibrils synthesized in nanoliter droplets are shorter and thicker compared to those synthesized via conventional heating method.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Mechanics
Philipp Weiss, Sthavishtha R. Bhopalam, Daniel W. Meyer, Patrick Jenny
Summary: This paper investigates the clustering and evaporation of droplets in reactive turbulence using direct numerical simulations. The mass loading and Stokes numbers play a crucial role in determining the behavior of droplet aggregation and flame structures in this turbulent environment.
Article
Materials Science, Multidisciplinary
Renan L. Biagio, Rodolfo T. Souza, Luiz R. Evangelista, Rafael S. Zola
Summary: The paper successfully achieved different organizations of CLC droplets by performing thermal quenches under several combinations of elastic constants and anchoring energy as chirality is increased. This method provides a faster and easier simulation approach compared to traditional methods, allowing for the study of complex arrangement of layered structures in soft condensed matter systems such as CLCs in curved geometries.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
William Janke, Lukas Hoeltkemeier, Angelika Kuehnle, Thomas Speck
Summary: Kinetic Monte Carlo simulations are used to study the growth of buckyball C-60 molecules on CaF2 substrates. By adjusting free diffusion parameters, the experimentally observed cluster densities and sizes can be well reproduced.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Physical
Hengming Zhang, Shasha Liu, Xueyu Wang, Shideng Yuan, Shiling Yuan
Summary: The molecular structure of emulsified oil droplets was investigated using molecular dynamics simulation. The simulation results revealed that the stacking structure of asphaltene and resin molecules forms the netlike structure of the oil droplet. Introduction of nonionic surfactants alters the hydrophilicity of the oil droplet surface and disrupts the stacking structure inside the droplet, resulting in reduced viscosity of the emulsified heavy oil.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Environmental Sciences
Ilaria Anna Maria Marino, Marcello Schiavina, Giorgio Aglieri, Stanislao Bevilacqua, Elisa Boscari, Leonardo Congiu, Sara Faggion, Claudia Kruschel, Chiara Papetti, Tomaso Patarnello, Marta Paterno, Emanuela Voutsinas, Lorenzo Zane, Paco Melia
Summary: Studies on the connectivity of the marbled crab in the Adriatic and Ionian basins revealed that the observed genetic homogeneity is mainly due to regional metapopulation dynamics rather than direct exchange among marine protected areas (MPAs). The study highlights the importance of considering appropriate dispersal features, habitat suitability, reproductive timing and duration when assessing genetic connectivity between MPAs or areas deserving protection.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Aerospace
Gen Zhu, Jiang Li, Kang Li, Shihui Cheng, Zhipeng He
Summary: The impact and aggregation of multiple alumina droplets on the inner wall of the solid rocket motor were studied. It was found that the aggregated droplet would rotate when two droplets aggregate, and when three droplets aggregate, the aggregated droplet is more likely to adhere to the wall. The rebound and adhesion characteristics of the aggregated droplet are of great significance for slag deposition and two-phase flow prediction in the motor.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Kai Zhang, Hao Li, Lei Xin, Pengchang Li, Weixiang Sun
Summary: This study investigates the phenomenon of small Wenzel droplets being engulfed by large Cassie droplets and verifies this hypothesis through experiments and simulations. The results show that engulfing small Wenzel droplets does not reduce the velocity of large Cassie droplets. The effects of the number and distribution of small Wenzel droplets on the motion state and velocity of large Cassie droplets are also examined.
APPLIED SURFACE SCIENCE
(2023)
Article
Thermodynamics
Marc Salvadori, Achyut Panchal, Suresh Menon
Summary: The use of liquid fuel in rotating detonation engines (RDE) has been evaluated through numerical simulations. It was found that injecting kerosene through the air plenum stabilizes the RDE operation when a pure gaseous H2 RDE cannot sustain detonation propagation. The injection of kerosene droplets aids in their evaporation and proper mixing of the vaporized mixture, allowing for continuous and stable propagation.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Astronomy & Astrophysics
Abhishek S. Maniyar, Athanasia Gkogkou, William R. Coulton, Zack Li, Guilaine Lagache, Anthony R. Pullen
Summary: High resolution cosmic microwave background (CMB) experiments have allowed precise measurements of CMB temperature power spectrum at small scales. This paper explores the presence of extragalactic CO molecular rotational line emissions in CMB maps and their contribution to the power spectrum. The results show that the CO emissions need to be considered in CMB auto-power spectrum and cross-correlation studies.
Article
Energy & Fuels
Bo Liao, Jintang Wang, Jinsheng Sun, Kaihe Lv, Lei Liu, Qi Wang, Ren Wang, Xindi Lv, Yudou Wang, Zhangxin Chen
Summary: Studying the synergism effect of different hydrate inhibitors on methane hydrate formation is crucial for developing new gas hydrate inhibitors and drilling and completion fluid systems.
Article
Engineering, Aerospace
Ruben Meireles, Leandro Magalhaes, Andre Silva, Jorge Barata
Summary: This paper presents a tool developed in-house for modeling free-falling water droplet cooling processes, utilizing a two-way coupling model and stochastic separated flow technique. The study focuses on the interactions between water droplets and carrier fluid at different humidity ratios, with consideration for heat and mass transfer coefficients and vibrations.
Article
Mechanics
Runze Duan, Heng Zhang, Liang Tian, Enyu Wang, Teng Liu, Ruolin Zhao, Liansheng Liu
Summary: Liquid level height, dropper inner diameter, and glycerin mass fraction have impact on droplet formation, while the optimal frequency for eliminating satellite droplets increases with the rise of liquid level height and dropper inner diameter. Longitudinal disturbance results in a decrease in the diameter and generation period of the main droplets.
Article
Biochemical Research Methods
Benjamin S. Hanson, Shinji Iida, Daniel J. Read, Oliver G. Harlen, Genji Kurisu, Haruki Nakamura, Sarah A. Harris
Summary: This study introduces a novel approach using FFEA algorithm to study the mechanics of cytoplasmic dynein, demonstrating that the continuum representation obtained from atomistic MD simulations is sufficient to capture its principal dynamic properties.
Article
Geochemistry & Geophysics
Daniel H. M. Richards, Samuel S. Pegler, Sandra Piazolo, Oliver G. Harlen
Summary: A new continuum model has been developed to accurately and efficiently predict the evolution of ice crystal fabric. By constraining model parameters with experimental data, the model shows good agreement with observations.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Physics, Applied
H. Gonzalez, J. Arcenegui, F. J. Garcia de Bollullos, J. R. Castrejon-Pita, A. A. Castrejon-Pita
Summary: Inspired by Savart's work, the study focuses on the self-stimulated dynamics of a capillary jet. A feedback loop controls surface perturbations of the jet, establishing phase-locked stimulation regimes for stability. The linear theory combining transfer functions of each stage explains the observed features.
PHYSICAL REVIEW APPLIED
(2021)
Article
Thermodynamics
Fabian Denner, Fabien Evrard, Alfonso Arturo Castrejon-Pita, Jose Rafael Castrejon-Pita, Berend van Wachem
Summary: This study analyses the capillary breakup of a liquid jet under large excitation amplitudes relevant to inkjet printing using numerical simulations. The results show the reversal of breakup length and inversion of breakup modes, both related to the formation of vortex rings and local flow obstruction inside the jet. An empirical similarity model for the breakup length reversal is proposed, allowing accurate prediction of jet behavior in practical situations, especially continuous inkjet printing.
FLOW TURBULENCE AND COMBUSTION
(2022)
Article
Mechanics
Khaled H. A. Al-Ghaithi, Oliver G. Harlen, Nikil Kapur, Mark C. T. Wilson
Summary: As inkjet technology advances to produce smaller droplets, the study explores the deposition of micro-droplets onto scratches of commensurate size, identifying seven equilibrium morphologies influenced by inertial spreading, contact-line pinning, imbibition, and capillary flow. Theoretical estimates align with numerical results from a three-dimensional multiphase lattice Boltzmann model, with discussions on the impacts of Reynolds number, Weber number, and contact angles for printing applications. Negative and positive implications for printing are discussed and illustrated through multiple-droplet simulations.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Karrar H. Al-Dirawi, Khaled H. A. Al-Ghaithi, Thomas C. Sykes, J. Rafael Castrejon-Pita, Andrew E. Bayly
Summary: Binary droplet collisions can result in coalescence or stretching separation, with the transition between these outcomes dependent on high Weber numbers and impact parameters. The effect of viscosity on this transition is revealed in an experimental study, showing an inertial behavior over a wide range of Ohnesorge numbers. Compelling evidence is provided to show that stretching separation only occurs when the length of the coalesced droplet exceeds a critical multiple of the original droplet diameters.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
E. Antonopoulou, O. G. Harlen, M. Rump, T. Segers, M. A. Walkley
Summary: The study investigated the impact of surfactants on inkjet printing, revealing that rapid jetting processes result in concentration gradients of surfactants and delay or prevent the separation between the head drop and the ligament, thereby inhibiting the formation of satellite drops.
Article
Chemistry, Multidisciplinary
Molly S. C. Gravett, Ryan C. Cocking, Alistair P. Curd, Oliver Harlen, Joanna Leng, Stephen P. Muench, Michelle Peckham, Daniel J. Read, Jarvellis F. Rogers, Robert C. Welch, Sarah A. Harris
Summary: Rapid advances in experimental biophysical techniques are generating a wealth of information about cellular cytoskeleton and its motors, but the need for new computational tools to integrate these data is essential. This article discusses the experimental advances and computational tools, proposing how to successfully combine emerging experimental data on cytoskeletal motors.
WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE
(2022)
Article
Mechanics
John Hinch, Oliver Harlen
Summary: The study examines Oldroyd's 1950 paper on rheological equations, introducing upper and lower convected time-derivatives, and the Oldroyd-A and Oldroyd-B model fluids. The choice between the A and B models is discussed based on micro-structural studies, suggesting something in between is appropriate. Finally, refinements are explored in terms of the elastic-dumbbell model.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2021)
Article
Chemistry, Physical
Thomas C. Sykes, Ben D. Fudge, Miguel A. Quetzeri-Santiago, J. Rafael Castrejon-Pita, Alfonso A. Castrejon-Pita
Summary: This study investigates the splashing behavior of millimetric droplets on convex and concave surfaces, and finds that the tendency of droplets to splash is proportional to the reciprocal of the substrate's radius of curvature, with it being harder for droplets to splash on small spheres.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Mechanics
C. R. Constante-Amores, J. Chergui, S. Shin, D. Juric, J. R. Castrejon-Pita, A. A. Castrejon-Pita
Summary: In this study, the effect of insoluble surfactants on the retracting dynamics of thin water sheets is investigated using an interface-tracking/level-set method. It is found that the surfactant concentration can delay or prevent the breakup of the sheet edge, revealing the significant role of Marangoni stresses in the retracting dynamics.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
P. A. Allen, R. M. Dorrell, O. G. Harlen, R. E. Thomas, W. D. McCaffrey
Summary: This paper investigates the effects of density and viscosity stratification in the lock-exchange configuration. The results show that viscosity stratification can only be neglected when the viscosity ratio is small, and the initial turbidity current composition can enhance its self-sustaining or accelerating ability at intermediate viscosity ratios.
Article
Mechanics
C. R. Constante-Amores, L. Kahouadji, S. Shin, J. Chergui, D. Juric, J. R. Castrejon-Pita, O. K. Matar, A. A. Castrejon-Pita
Summary: We investigate the influence of insoluble surfactants on the impact of surfactant-free droplets onto surfactant-laden thin liquid films using a three-dimensional numerical simulation approach. Our results show that the presence of surfactants affects the late stages of the dynamics by delaying the end-pinching mechanisms, resulting in longer ligaments. We also demonstrate that the addition of surfactants leads to surface rigidification and retards the flow dynamics.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Thomas C. Sykes, Radu Cimpeanu, Ben D. Fudge, J. Rafael Castrejon-Pita, Alfonso A. Castrejon-Pita
Summary: When a fast droplet impacts a pool of the same fluid, the depth of the pool is revealed to be a critical factor in the formation of ejecta sheets. On deeper pools, the sheets fold inwards, while on shallower pools, they develop into outward-propagating lamellae. This transition is caused by a confinement effect of the pool base on the impact-induced pressure, which restricts flow into the ejecta sheet from the droplet.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
K. L. Meza-Alarcon, M. A. Quetzeri-Santiago, M. A. Neri-Flores, J. Antonio del Rio, J. R. Castrejon-Pita
Summary: In this study, the behavior and spreading dynamics of molten metallic alloy droplets were investigated. The impact behavior of five different solders was analyzed in terms of material and impact conditions. The results showed that the impact behavior could be well described by the splashing ratio and the maximum dynamic spreading contact angle. This study provides useful criteria for selecting the soldering injection speed and droplet size in industrial applications to prevent splashing during soldering or molten metal jetting.
