Article
Mechanics
Hui Zhao, Dung Nguyen, Daniel Edgington-Mitchell, Julio Soria, Hai-Feng Liu, Damon Honnery
Summary: This study aims to investigate the largest diameter of falling drop in the up-gas flow. The phenomenon of drop breakup in the airflow, known as secondary atomization, is commonly observed in nature and industry. The critical Weber number is used to determine the beginning of drop breakup. This study explains the different critical Weber numbers for free-fall raindrops breakup and secondary atomization based on the Rayleigh-Taylor instability. The study proposes a theoretical criterion for the largest raindrop size and suggests a map of falling drop size regions to explain the occurrence of super-large raindrops. Additionally, the findings of this study have practical implications for reducing drop entrainment in washing towers.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Thermodynamics
Maxim Piskunov, Jan Breitenbach, J. Benedikt Schmidt, Pavel Strizhak, Cameron Tropea, Ilia Roisman
Summary: The study investigates secondary atomization resulting from the impact of a water-in-oil emulsion drop on a hot sapphire glass surface. It demonstrates that higher emulsion concentrations significantly reduce the size of secondary droplets.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Multidisciplinary Sciences
G. Rigon, B. Albertazzi, T. Pikuz, P. Mabey, V Bouffetier, N. Ozaki, T. Vinci, F. Barbato, E. Falize, Y. Inubushi, N. Kamimura, K. Katagiri, S. Makarov, M. J-E Manuel, K. Miyanishi, S. Pikuz, O. Poujade, K. Sueda, T. Togashi, Y. Umeda, M. Yabashi, T. Yabuuchi, G. Gregori, R. Kodama, A. Casner, M. Koenig
Summary: This study successfully measured the turbulent spectrum in a laser-plasma experiment at the micron scale, providing a platform for the direct comparison of experimental results, theory, and numerical simulations.
NATURE COMMUNICATIONS
(2021)
Article
Mechanics
K. Dhivyaraja, M. Jegan, M. Vadivukkarasan
Summary: A new atomization method, Rayleigh-Taylor instability induced atomization (RTA), is proposed to destabilize an annular liquid sheet ejected from a gas turbine engine injector. The experimental results align well with the theoretical model under certain conditions, providing a new avenue for the development of atomizers.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Mechanics
Yifan Liang, Lars Christian Johansen, Mark Linne
Summary: This paper investigates the influence of swirl number (S) and aerodynamic Weber number (We(A)) on shear-based spray formation. The experimental results show that increasing the swirl number improves atomization and disperses the droplets. However, in certain flow conditions, the droplet diameter is not related to the swirl number.
Article
Mechanics
Rina Nakajima, Kosuke Hayashi
Summary: Experiments were conducted to study the behavior of liquid drops falling through a miscible liquid. It was observed that the drops deform into vortex rings and fragment into smaller drops due to the Rayleigh-Taylor instability. The number of smaller drops was measured for different Archimedes numbers, and the influence of vortex ring interactions on fragmentation was analyzed.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Thermodynamics
Atul Kumar, Hsien-Wen Chen, Shouyin Yang
Summary: This study improved existing models by conducting experiments to determine breakup delay, child droplet dynamics, and the effect of microexplosion. The modeling results are consistent with the experimental results. The study improved the models of microexplosion to facilitate their use in the secondary atomization of multicomponent fuels.
Article
Physics, Multidisciplinary
Bin Liu, Chunhua Zhang, Qin Lou, Hong Liang
Summary: In this paper, the late-time evolution mechanism of 3D single-mode immiscible Rayleigh-Taylor instability (RTI) was numerically studied. It was found that the development of RTI can be divided into four stages, and complex interfacial structures were observed in the turbulent mixing stage. The growth rates of spikes and bubbles were analyzed using five statistical methods, and it was revealed that the spike growth rate increases with the Atwood number, while the bubble growth rate remains steady.
FRONTIERS OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Kazuya U. Kobayashi, Rei Kurita
Summary: This study investigates the gravitationally-driven instability in physical gels and granular systems, finding quantitative similarities between the two. The research shows that the instability is primarily governed by the thickness of the flowable region.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Fluids & Plasmas
Oliver Tolfts, Guillaume Deplus, Nathanael Machicoane
Summary: The breakup of a liquid jet by a surrounding gas jet was investigated using high-speed back-lit imaging. The focus of the study was on the time dynamics and statistics of the liquid jet length. Different inlet velocities were used to obtain a wide range of gas and liquid Reynolds numbers, gas-to-liquid dynamic pressure ratio M, and Weber number. The study covered a variety of scales and explored two breakup regimes by adapting the imaging system's spatial and temporal resolutions. The length distributions of the liquid jet were analyzed and the first two moments were found to be power laws of M, with a constant ratio. The temporal dynamics were studied using autocorrelation functions and showed that the correlation times were controlled by the gas jet, with a secondary influence of the liquid Reynolds number.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Mechanics
Malamas Tsagkaridis, Stelios Rigopoulos, George Papadakis
Summary: The objective of this study is to investigate the interaction between turbulence and coagulation through direct numerical simulation (DNS) coupled with the population balance equation (PBE). The study found that correlations due to turbulent fluctuations of particle number density make a significant contribution to the coagulation process.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Thermodynamics
Maxim Piskunov, Alexandra Semyonova, Alexander Ashikhmin, Vladislav Fedorov, Nikita Khomutov, Sergey Misyura
Summary: The experimental study investigates the unstable equilibrium of an emulsion drop's lamella and rim after colliding with a solid surface at high temperatures, taking into account the emulsion concentration and the presence of a stable boundary vapor layer. It reveals the relationship between the delay time of lamella destabilization and the characteristics of diffusive and convective heat transfer. The study also demonstrates the combined effect of Weber number and emulsion concentration on the critical Rayleigh and Marangoni numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Physics, Fluids & Plasmas
C. R. Weber, D. S. Clark, D. T. Casey, G. N. Hall, O. Jones, O. Landen, A. Pak, V. A. Smalyuk
Summary: In inertial confinement fusion (ICF) implosions, the interface between the cryogenic DT fuel and the ablator is unstable to shock acceleration and constant acceleration. The Rayleigh-Taylor instability (RT) can produce oscillatory motion that stabilizes against the Richtmyer-Meshkov instability (RM) if the constant acceleration is in the direction of lighter material. This characteristic is now being incorporated into newer designs to improve compression while minimizing ablator mixing into the fuel.
Article
Physics, Multidisciplinary
A. Lees, R. Betti, J. P. Knauer, V. Gopalaswamy, D. Patel, K. M. Woo, K. S. Anderson, E. M. Campbell, D. Cao, J. Carroll-Nellenback, R. Epstein, C. Forrest, V. N. Goncharov, D. R. Harding, S. X. Hu, I. V. Igumenshchev, R. T. Janezic, O. M. Mannion, P. B. Radha, S. P. Regan, A. Shvydky, R. C. Shah, W. T. Shmayda, C. Stoeckl, W. Theobald, C. Thomas
Summary: Statistical modeling has improved predictive capability for deuterium-tritium layered cryogenic implosions at the OMEGA laser, revealing dependencies of fusion yield and identifying degradation mechanisms. Adjusted for factors like tritium decay and l = 1 mode, the highest predicted yield in OMEGA cryogenic implosions exceeds 2 x 10^14 fusion reactions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Etienne Jambon-Puillet, Pier Giuseppe Ledda, Francois Gallaire, P-T Brun
Summary: When the substrate is slightly tilted, the conventional growth of pendant drops is unexpectedly reversed, leading to drops that move too fast to grow and shrink. Through experiments and numerical simulations, the transition between the conventional growth regime and the previously unknown decay regime can be rationalized, with the critical inclination angle for the transition quantitatively predicted using analytical treatment of the Landau-Levich meniscus connecting the drop to the film.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Chemical
N. Rimbert, L. Claudotte, P. Gardin, J. Lehmann
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2014)
Article
Mechanics
Romain Guichard, Anne Taniere, Emmanuel Belut, Nicolas Rimbert
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2014)
Article
Physics, Fluids & Plasmas
Nicolas Rimbert
Article
Metallurgy & Metallurgical Engineering
L. Claudotte, N. Rimbert, P. Gardin, M. Simonnet, J. Lehmann, B. Oesterle
STEEL RESEARCH INTERNATIONAL
(2010)
Article
Mechanics
N. Rimbert, S. Castrillon Escobar, R. Meignen, M. Hadj-Achour, M. Gradeck
JOURNAL OF FLUID MECHANICS
(2020)
Article
Environmental Sciences
Gael Cherrier, Emmanuel Belut, Fabien Gerardin, Anne Taniere, Nicolas Rimbert
ATMOSPHERIC ENVIRONMENT
(2017)
Article
Construction & Building Technology
R. Guichard, A. Taniere, E. Belut, N. Rimbert
INTERNATIONAL JOURNAL OF VENTILATION
(2013)
Article
Public, Environmental & Occupational Health
V. Cesard, E. Belut, C. Prevost, A. Taniere, N. Rimbert
ANNALS OF OCCUPATIONAL HYGIENE
(2013)