Article
Mechanics
Naveen Rohilla, Partha S. Goswami
Summary: This article explores the variation of local isotropy of fluid fluctuations and the decrease of the Kolmogorov constant in particle-laden turbulent channel flows. The author also adopts a new modeling technique using large-eddy simulation (LES) to predict fluid phase statistics without solving simultaneous particle phase equations. This study provides insights into the phenomena of drastic collapse in turbulence intensity.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Yan Xia, Zhaosheng Yu, Zhaowu Lin, Yu Guo
Summary: This study establishes correlations between the interfacial terms and the fluid dissipation rate equation and Reynolds stress equations in particle-laden flows, providing an accurate mathematical model and method for simulating particle-induced turbulence.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Duan Z. Zhang
Summary: This study establishes a relationship between ensemble average and nearest particle statistics to study long-range particle interactions and calculate particle sedimentation velocity. Additionally, it introduces an important particle-fluid-particle stress for general multiphase flows.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Jooyeon Park, Hyungmin Park
Summary: In this study, the effects of counter-rotating vortex pairs on particle dispersion patterns in a particle-laden upward jet with a horizontal crossflow were experimentally investigated. The results showed that the dynamics of the flow, influenced by the velocity ratio and particle Stokes number, play a crucial role in particle dispersion. Counter-rotating vortex pairs above the jet exit were found to significantly affect the movement of particles, with different regimes of particle dispersion identified based on Stokes number and velocity ratio.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Cheng-Hsien Lee
Summary: This study developed a multiphase model with a novel evolution equation to address the issues of shear-induced volume change and pore-pressure feedback in submarine granular flows simulated using an Eulerian-Eulerian two-phase model. The evolution equation effectively describes the relaxation process of static solid pressure and shear-induced volume change, allowing the model to capture phenomena such as time delays in initiating flows and different collapse processes for differently packed columns.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Electrical & Electronic
Nicolas Rasmont, Hussein Al-Rashdan, Gregory Elliott, Joshua Rovey, Laura Villafane
Summary: This paper presents a novel method for measuring the concentration of particles in optically opaque particle-laden flows. The method utilizes millimeter wave interferometry to measure the path-integrated particle concentrations using a fully-integrated FMCW radar. The instrument is capable of high-speed and quantitative measurements in dispersed multiphase flows with higher concentrations than existing optical methods. Calibration and validation experiments demonstrate the effectiveness of the measurement concept.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Mechanics
Holger Grosshans, Claus Bissinger, Mathieu Calero, Miltiadis Papalexandris
Summary: Through direct numerical simulations, we found that under certain density ratios and Coulombic-to-gravitational force ratios, electrostatic forces play a dominant role in the vortical motion of particles, affecting their distribution within the duct.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Meisam Pourali, Nick O. Jaensson, Martin Kroeger
Summary: Translation of a non-spherical particle trapped at a membrane or at a complex interface between fluids is a relevant situation occurring in biological, technological and everyday life systems. The resistance experienced by prolate spheroidal particles at a viscous interface can both rise or decrease with particle size depending on the dimensionless Boussinesq and Marangoni numbers. The distribution of surfactant in the vicinity of the moving spheroid is significantly affected by the particle's immersion depth at a surfactant-laden interface.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Xinchen Zhang, Graham J. Nathan, Zhao F. Tian, Rey C. Chin
Summary: Numerical simulations were used to identify the dominant mechanism driving secondary flow motions in horizontal particle-laden pipe flows. Different flow regimes and their corresponding secondary flow structures were characterized by varying the mass loading. Analysis of forces acting on the fluid phase and particle phase helped explain the secondary flows and their interactions.
JOURNAL OF FLUID MECHANICS
(2022)
Review
Multidisciplinary Sciences
Aleksey Yu. Varaksin, Sergei V. Ryzhkov
Summary: This paper reviews computational-theoretical and experimental works on the flow of bodies in two-phase (dispersed) flows. The motion of particles near bodies of different shapes, as well as the impact of the dispersed phase on resistance and heat transfer, are discussed. The consequences of particle and droplet interaction with the surface of streamlined bodies (erosive destruction, gas-dynamic spraying, icing, glowing) are also analyzed.
Article
Mechanics
S. Beetham, R. O. Fox, J. Capecelatro
Summary: In this study, model closures for multiphase Reynolds-averaged Navier-Stokes (RANS) equations are developed using sparse regression and Eulerian-Lagrangian simulations to ensure accuracy and robustness of the models across different flow conditions. The focus is on capturing the dynamics of gas-particle flows, particularly the generation of particle clusters and interphase momentum exchange, in a compact and algebraic manner.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Darish Jeswin Dhas, Anubhab Roy
Summary: In this paper, the role of shear-induced migration and particle-induced normal stresses in the formation and stability of a particle-laden, gravity-driven shallow flow is studied. Through experiments and analysis, it is found that shear-induced migration leads to viscosity stratification and affects the development of the boundary layer formation in different conditions. It is also observed that increasing bulk particle concentration delays the onset of instability when the associated Peclet number is small, but enhances both modes of instability when the Peclet number is large. Additionally, it is shown that beyond a critical Peclet number, the surface mode becomes unstable even in the absence of fluid inertia.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Kerlyns Martinez Rodriguez, Mireille Bossy, Radu Maftei, Seyedafshin Shekarforush, Christophe Henry
Summary: This article presents a new data-driven spatial decomposition algorithm that allows for the splitting of a domain containing point particles into elementary cells with spatially-uniform distributions of particles. By using statistical information, the algorithm extracts an optimal spatial decomposition, providing more accurate and mesh-independent predictions for studying particle agglomeration.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Mechanics
Sofia Angriman, Amelie Ferran, Florencia Zapata, Pablo J. Cobelli, Martin Obligado, Pablo D. Mininni
Summary: This study investigates the three-dimensional clustering of velocity stagnation points, vorticity nulls, and inertial particles in turbulent flows with different large-scale flow geometries by combining direct numerical simulations and particle tracking velocimetry. The results show that although the flows have different topologies in terms of null clustering, the behavior of particles is similar in all cases, indicating the clustering of Taylor-scale neutrally buoyant particles as inertial particles.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Y. Mezui, M. Obligado, A. Cartellier
Summary: This study revisits the hydrodynamics of bubble columns in the heterogeneous regime. By conducting experiments and analyzing data, the self-organization phenomenon in the heterogeneous regime and the applicability of velocity scaling under different conditions are confirmed. Furthermore, the importance of velocity scaling for coalescing media is discussed.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Zlatko Solomenko, Peter D. M. Spelt, Lennon O. Naraigh, Pascal Alix
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2017)
Article
Computer Science, Interdisciplinary Applications
Zlatko Solomenko, Peter D. M. Spelt, Pascal Alix
JOURNAL OF COMPUTATIONAL PHYSICS
(2017)
Article
Computer Science, Interdisciplinary Applications
M. Capuano, C. Bogey, P. D. M. Spelt
JOURNAL OF COMPUTATIONAL PHYSICS
(2018)
Article
Mechanics
Aurore Loisy, Aurore Naso, Peter D. M. Spelt
JOURNAL OF FLUID MECHANICS
(2018)
Article
Mechanics
A. Titta, M. Le Merrer, F. Detcheverry, P. D. M. Spelt, A. -L. Biance
JOURNAL OF FLUID MECHANICS
(2018)
Article
Mechanics
Lennon O. Naraigh, Peter D. M. Spelt
JOURNAL OF FLUID MECHANICS
(2018)
Article
Multidisciplinary Sciences
Stephen Blowers, Ian Marshall, Michael Thrippleton, Peter Andrews, Bridget Harris, Iain Bethune, Prashant Valluri
SCIENTIFIC REPORTS
(2018)
Article
Chemistry, Multidisciplinary
Yuhong Chen, Alexandros Askounis, Vasileios Koutsos, Prashant Valluri, Yasuyuki Takata, Stephen K. Wilson, Khellil Sefiane
Article
Physics, Applied
Hongyu Zhao, Daniel Orejon, Coinneach Mackenzie-Dover, Prashant Valluri, Martin E. R. Shanahan, Khellil Sefiane
APPLIED PHYSICS LETTERS
(2020)
Article
Mechanics
Erich Essmann, Pei Shui, Stephane Popinet, Stephane Zaleski, Prashant Valluri, Rama Govindarajan
JOURNAL OF FLUID MECHANICS
(2020)
Article
Mechanics
A. G. L. Williams, G. Karapetsas, D. Mamalis, K. Sefiane, O. K. Matar, P. Valluri
Summary: This study investigates the dynamics of thin volatile droplets consisting of binary mixtures on a heated substrate. The developed model accurately predicts spreading and retraction of the droplets, with experiments confirming the preferential evaporation of more volatile components driving superspreading in some cases.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Zhenying Wang, George Karapetsas, Prashant Valluri, Khellil Sefiane, Adam Williams, Yasuyuki Takata
Summary: Studies on the evaporation of multicomponent droplets have revealed complex physical mechanisms such as density-driven flows, phase separation, transient Marangoni flow, and solutal effects. By adding hygroscopic salts, the adhesive properties and direction of water vapor mass flux of the droplet can be controlled. The dynamics of hygroscopic aqueous solution droplets are analyzed, showing competition between capillary, thermal Marangoni, and solutal Marangoni mechanisms during evaporation or vapor absorption.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Julian F. Scott, Zlatko Solomenko, Peter D. M. Spelt
Summary: This study investigates the behavior of a two-dimensional liquid drop attached to a sinusoidally vibrating wall in the presence of gas, focusing on the damping mechanisms of drop oscillations at small Ohnesorge numbers. The study identifies two distinct damping mechanisms, one from viscous dissipation near the contact lines and characterized by a parameter beta, and the other from the boundary layer at the wall of order Oh(1/2). The research shows that the relative importance of these damping mechanisms depends on the contact angle and beta/Oh(1/2), with cases where one mechanism is dominant or both mechanisms have comparable effects.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Physics, Fluids & Plasmas
R. K. Nazareth, G. Karapetsas, K. Sefiane, O. K. Matar, P. Valluri
PHYSICAL REVIEW FLUIDS
(2020)
Article
Mechanics
Aurore Loisy, Aurore Naso, Peter D. M. Spelt
JOURNAL OF FLUID MECHANICS
(2017)