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
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
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
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
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)
Article
Mechanics
Xiaojing Zheng, Guohua Wang, Wei Zhu
Summary: This study investigates the influence of the interaction between heavy particles (high Stokes number) and the wall on two-phase flows and large-scale turbulent structures. Experimental results confirm that the P-W process significantly affects the size and strength of VLSM.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Hongyou Liu, Yuen Feng, Xiaojing Zheng
Summary: This study conducted experiments on particle-free and particle-laden flows in a horizontal wind tunnel to investigate the effects of collision bounces and impact splashing on turbulence statistics. The findings reveal the importance of particle motions to turbulence and provide further insight into the interactions between particles and turbulence in two-phase flows with erodible surfaces.
JOURNAL OF FLUID MECHANICS
(2022)
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
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
Vasco Duke-Walker, W. Curtis Maxon, Sahir R. Almuhna, Jacob A. McFarland
Summary: In this study, the effects of evaporation and breakup on mixing induced by SDMI were examined through simulations and compared with experimental results. The evaporation model was validated and a new breakup model was presented for low Reynolds number droplets. Simulation results highlighted the importance of breakup parameters on evaporation rate and mixing in SDMI.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Xibo He, Hongyou Liu
Summary: The spatial relationship between turbulent and particle concentration structures is investigated based on the turbulent velocity and particle concentration data obtained synchronously at the Qingtu Lake Observation Array site. The study found that the scale of turbulent motions that have the most significant coherence with particle concentration follows a 1/2 power scaling law with the local height and atmospheric surface layer (ASL) thickness. The study also reveals that large-scale turbulent velocity fluctuations have a significant amplitude modulation effect on particle concentration fluctuations, but the effect is different for small dust particles and large saltating particles. Furthermore, a conceptual model reflecting the relationship between the two is proposed, and a quantitative formulation is derived and found to be in good agreement with the experimental results. These findings and the proposed model contribute insights into particle-turbulence interactions, providing theoretical support for a unified model of turbulence dynamics and particle kinematics.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
M. Shyam Kumar, Manikandan Mathur, S. R. Chakravarthy
Summary: The study investigates the effects of initial droplet field characteristics on the maximum droplet size growth in turbulent air flow. The research found that the turbulence intensity and initial droplet number density play crucial roles in influencing the droplet size growth rate. Increasing the initial droplet number density can enhance droplet collisions and potentially lead to rapid growth of droplet size under certain conditions.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Chemical
J. L. Castillo, S. Martin, D. Rodriguez-Perez, F. J. Higuera, P. L. Garcia-Ybarra
JOURNAL OF AEROSOL SCIENCE
(2018)
Article
Engineering, Chemical
F. J. Higuera
JOURNAL OF AEROSOL SCIENCE
(2018)
Article
Mechanics
F. J. Higuera
JOURNAL OF FLUID MECHANICS
(2018)
Article
Thermodynamics
E. J. Higuera
COMBUSTION AND FLAME
(2019)
Article
Thermodynamics
Gabriel Garcia-Soriano, Sergio Margenat, Francisco J. Higuera, Jose L. Castillo, Pedro L. Garcia-Ybarra
COMBUSTION AND FLAME
(2019)
Article
Mechanics
J. Guerrero, A. J. Hijano, M. A. Lobato, F. J. Higuera, I. G. Loscertales, A. Fernandez-Nieves
Article
Thermodynamics
E. Trottini, F. J. Higuera
Summary: The combustion of an aluminum droplet in an oxidizer atmosphere goes through several stages, characterized by changes in the flame and the development of an oxide cap. Asymmetric combustion is associated with the appearance of an oxygen-rich liquid phase.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Article
Thermodynamics
G. Garcia-Soriano, S. Margenat, F. J. Higuera, J. L. Castillo, P. L. Garcia-Ybarra
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2020)
Article
Engineering, Chemical
M. Khalifehei, F. J. Higuera
JOURNAL OF AEROSOL SCIENCE
(2020)
Article
Engineering, Chemical
F. J. Higuera, Juan Fernandez de la Mora
JOURNAL OF AEROSOL SCIENCE
(2020)
Article
Physics, Fluids & Plasmas
Abel Lopez-Villa, Abraham Medina, E. J. Higuera, Jonatan R. Mac Intyre, Carlos Alberto Perazzo, Juan Manuel Gomba
Article
Thermodynamics
J. M. Tejera, W. O. Irrazabal, F. J. Higuera, A. Linan
COMBUSTION SCIENCE AND TECHNOLOGY
(2018)
Proceedings Paper
Computer Science, Theory & Methods
Ayax Torres, Salomon Peralta, Abraham Medina, Jaime Klapp, Francisco Higuera
HIGH PERFORMANCE COMPUTING CARLA 2016
(2017)
Article
Mechanics
F. J. higuera
JOURNAL OF FLUID MECHANICS
(2017)
Article
Thermodynamics
F. J. Higuera, J. M. Tejera
COMBUSTION AND FLAME
(2017)