Article
Mechanics
S. Heitkam, K. Eckert
Summary: This work demonstrates that anisotropic drainage in sheared foam leads to convective instability in very long foam channels, with liquid accumulating on one side of the channel when a critical liquid fraction is exceeded. Experimental and numerical simulations show that the critical liquid fraction is smaller than previously thought by a factor of five.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Laurent Lacaze, Joris Bouteloup, Benjamin Fry, Edouard Izard
Summary: This study investigates the collapse of a granular column in a liquid using numerical simulations, focusing on the influence of Stokes number St and the initial volume fraction phi(i) on the dynamics of the collapse. A dedicated numerical model with a discrete element method is used to provide a comprehensive description of the granular phase in dense granular flows. The research aims to characterize the dynamics of the collapse and its final deposit in relation to (St, phi(i)), as well as to describe the granular rheology and dilatancy effects based on these two dimensionless numbers.
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
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
Lise Ceresiat, Jari Kolehmainen, Ali Ozel
Summary: The study derives the charge transport equation for bidisperse granular flows with contact electrification, and evaluates the revisited hydrodynamic equations and derived charge transport equation through hard-sphere simulations.
JOURNAL OF FLUID MECHANICS
(2021)
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
T. Trewhela, C. Ancey, J. M. N. T. Gray
Summary: Particles of differing sizes are prone to segregation in shear driven flows, affecting industrial processes and hazardous geophysical mass flows. Refractive-index matched oscillatory shear-cell experiments have identified a unifying scaling law for segregation velocity in extreme cases.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
A. Gergely, Cs. Paizs, R. Toetoes, Z. Neda
Summary: Research on convection-driven fluid columns reveals that increasing the nozzle diameter results in decreased oscillation frequency, while increasing the flow rate leads to higher frequency. Anti-phase synchronization and beating phenomena are observed when helium columns of nearby frequencies are placed close to each other.
Article
Mechanics
N. Yadav, S. W. Gepner
Summary: Numerical analysis was used to study Couette-Poiseuille (CP) flow in the presence of longitudinal grooves. It was found that the grooves can modify the flow, decrease the phase speed of unstable waves, and reduce the distance required for nonlinear effects.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
John P. Koulakis, S. Putterman
Summary: The study investigates the driving force of acoustic field on fluid inhomogeneities, showing that above a certain threshold, the acoustic field can induce instability in the fluid. The locations of acoustic velocity antinodes separate regions of convective stability and instability, and the growth of convective modes with different wavenumbers is influenced by inertia and viscosity.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Water Resources
Mojtaba Jandaghian, Abdelkader Krimi, Ahmad Shakibaeinia
Summary: The study presents a three-dimensional particle method based on an Enhanced Weakly-Compressible MPS approach for modeling immersed dense granular flows. By using a generalized rheological model and introducing a modified high-order diffusive term, the accuracy of the multiphase particle methods is improved, and experimental validation is conducted.
ADVANCES IN WATER RESOURCES
(2021)
Article
Mechanics
Huabin Shi, Ping Dong, Xiping Yu, Yan Zhou
Summary: This paper proposes a theoretical formulation for dilatation/contraction in granular flows, considering both frictional and collisional effects. The formulation is verified analytically and numerically, demonstrating its application in studying the collapse of submerged granular columns.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
A. Mishra, G. Mamatsashvili, V. Galindo, F. Stefani
Summary: We investigate the convective and absolute forms of azimuthal magnetorotational instability in a cylindrical Taylor-Couette flow with an imposed azimuthal magnetic field. Our results show that the convective AMRI domain is wider than the absolute AMRI domain, but the absolute instability is more relevant and important for magnetic TC flow experiments. The global AMRI in a TC flow of finite height exhibits a butterfly-type structure, with two dominant absolute AMRI modes giving rise to this pattern in a good agreement with linear analysis.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Fluids & Plasmas
Meng Liu, Christoph R. Muller
Summary: The lift force model for intruders in dense, granular shear flows takes into account granular temperature, pressure differences, and density differences between the intruder and the bed particles. The model accurately predicts and explains the behavior of intruders in shear flows.
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
Engineering, Chemical
Junnan Zhao, Guodong Liu, Wei Li, Xiaolong Yin, Yao Wu, Chunlei Wang, Huilin Lu
CHEMICAL ENGINEERING SCIENCE
(2020)
Article
Engineering, Environmental
Yang Guo, Jincheng Lou, Jae Kyoung Cho, Nils Tilton, Jaehun Chun, Wooyong Um, Xiaolong Yin, Keith B. Neeves, Ning Wu
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Engineering, Chemical
Junnan Zhao, Guodong Liu, Xiaolong Yin, Xiaohui Li, Zhiyong Gao, Huilin Lu
Summary: Spout-fluid beds are widely used in industries for efficient particle and gas contact. A two-fluid model (TFM) was used to study flow structures in spout-fluid bed operation. Results showed that an effective restitution coefficient in TFM improves prediction accuracy significantly, with kinetic motion dominating particle-particle momentum transfer in certain regions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Petroleum
Ye Tian, Chi Zhang, Zhengdong Lei, Xiaolong Yin, Hossein Kazemi, Yu-Shu Wu
Summary: An improved multicomponent diffusion model for fractured reservoirs was proposed to better quantify the transport processes across the fracture/matrix interface. The model was validated with diffusion experiments and showed better match with a fine-grid model compared to the double-porosity model. The simulation of a gas huff 'n' puff well demonstrated that including diffusion can affect the performance, especially for gas recovery and oil rate.
Article
Engineering, Environmental
Jingwei Huang, Xiaolong Yin, Maria Barrufet, John Killough
Summary: This study employed a pseudopotential lattice Boltzmann method to simulate the phase equilibrium of methane in nanopores and investigated the effects of adsorption and fluid-solid force on confined phase behavior. It was found that the density distribution of fluid in nanopores is heterogeneous, and the critical temperature and pressure decrease while the critical density increases as the fluid-solid force increases. Additionally, an increase in fluid-solid force results in a significant decrease in gas density in equilibrium with condensed liquid.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Jingwei Huang, Feng Xiao, Carlos Labra, Jin Sun, Xiaolong Yin
Summary: This study investigates stress-dependent absolute and relative permeabilities in porous media using two methods, revealing the power-law relation between absolute permeability and porosity during compaction, as well as the complex influences on relative permeability from factors such as pore structure, fluid properties, and rock surface characteristics.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Minsu Cha, Naif B. Alqahtani, Xiaolong Yin, Lei Wang, Bowen Yao, Timothy J. Kneafsey, Jennifer L. Miskimins, Yu-Shu Wu
Summary: Cryogenic fracturing involves exposing rock surfaces to cryogenic fluids, which creates large thermal gradients and generates local tensile stress that initiates fractures. Experiments conducted on transparent PMMA specimens show that initial fracture growth is abrupt, with distinct horizontal/radial and vertical fractures separated by specific distances. Fractures resulting from interactions and curvatures can develop into complex shapes, with cryogenic thermal loading inducing curved fractures. Increased borehole pressure during liquid nitrogen flow can lessen fracture tortuosity and promote radial propagation, while higher flow pressure and rate accelerate cooling and fracture propagation.
Article
Engineering, Chemical
Younki Cho, Ryan Lo, Keerthana Krishnan, Xiaolong Yin, Hossein Kazemi
Summary: This paper presents an oscillation-based method for measuring absolute adsorption in porous rocks, taking into account excess adsorption. Experimental results show that accurate absolute adsorption can be obtained by subtracting the added mass of co-accelerated gas outside the sample and assuming no excess adsorption exists inside the sample.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Do Yoon Moh, Hongwei Zhang, Shihao Wang, Xiaolong Yin, Rui Qiao
Summary: The study investigates the soaking step of CO2 Huff-n-Puff in a single, 4 nm-wide calcite pore using molecular dynamics simulations. The results show that CO2 molecules can be adsorbed on pore walls and diffuse along the walls or into the pore's interior as free molecules. The movement of adsorbed and free CO2 molecules inside the pore obeys a specific scaling law, highlighting the importance of surface adsorption in the storage and transport of CO2 in unconventional oil reservoirs.
Article
Energy & Fuels
Ziming Zhu, Chao Fang, Rui Qiao, Yakup Coskuner, Xiaolong Yin, Erdal Ozkan
Summary: In nanoporous rocks, potential size exclusion and fluid-rock interactions can turn the rock into a semi-permeable membrane, hindering the transport of certain molecules. The study found that Niobrara samples exhibit selective hindrance to a liquid hydrocarbon mixture, mainly due to the hindered transport of heavier components.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Xiaohui Li, Guodong Liu, Junnan Zhao, Xiaolong Yin, Huilin Lu
Summary: Particle sedimentation is an important process in various industrial applications. This study uses a combined immersed boundary lattice Boltzmann method and discrete element method to investigate the behavior of two particles during sedimentation. The results show that the phenomenon of drafting-kissing-tumbling (DKT) interaction between two particles mainly occurs when the particles have nearly vertically aligned initial positions. The probability of collision between particles depends on the Reynolds number and the initial angle.
Article
Energy & Fuels
Zihao Li, Qingqi Zhao, Yuntian Teng, Ming Fan, Nino Ripepi, Xiaolong Yin, Cheng Chen
Summary: In this study, the non-monotonic relationship between fracture conductivity and proppant concentration was experimentally validated and investigated. It was found that a relatively low proppant amount can form a partial-monolayer proppant pack, which can achieve similar or even higher fracture conductivity compared to multilayer proppant structures. This finding has important economic implications.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Junnan Zhao, Guodong Liu, Xiaolong Yin, Xinyao Guo, Xiaohui Li, Huilin Lu
Summary: In this study, a new solid stress model is proposed for simulating gas-particle flows in both dilute and dense regimes, taking into account friction and the effect of local solid volume fraction gradient. The model closes solid stress using a modified kinetic theory in the dilute regime and an inertial number model in the dense regime. The transition between dilute and dense regimes is achieved by using a dimensionless parameter chi that is a function of the inertial number Is. Experimental data and discrete particle simulation are used to validate the model. The new model shows improved transition and particle velocity predictions compared to the traditional kinetic-frictional stress model in both spout-fluid bed and bubbling fluidized bed.
Article
Thermodynamics
Walid Mohamed Mahmud, Xiaolong Yin, Mansur Ermila
JOURNAL OF POROUS MEDIA
(2020)
Article
Chemistry, Physical
Do Yoon Moh, Chao Fang, Xiaolong Yin, Rui Qiao
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)