90 citations · 685 across the 24 of their papers we have counts for
24 papers
Dissipative Particle Dynamics and other particle methods for multiphase fluid flow in fractured and porous media
Paul Meakin, Zhijie Xu
Particle methods are less computationally efficient than grid based numerical solution of the Navier Stokes equation. However, they have important advantages including rigorous mas…
Investigation of countercurrent flow profile and liquid holdup in random packed column with local CFD data
Yucheng Fu, Jie Bao, Rajesh Kumar Singh +2
Liquid holdup and mass transfer area are critical parameters for packed column design and CO2 capture efficiency prediction. In this paper, a framework was established for modeling…
Hydrodynamics of countercurrent flows in a structured packed column: effects of initial wetting and dynamic contact angle
Rajesh Kumar Singh, Jie Bao, Chao Wang +2
Computational countercurrent flow investigation in the structured packed column is a multiscale problem. Multiphase flow studies using volume of fluid (VOF) method in the represent…
Latent Space Simulation for Carbon Capture Design Optimization
Brian Bartoldson, Rui Wang, Yucheng Fu +5
The CO2 capture efficiency in solvent-based carbon capture systems (CCSs) critically depends on the gas-solvent interfacial area (IA), making maximization of IA a foundational chal…
Direct effect of solvent viscosity on the physical mass transfer for wavy film flow in a packed column
Zhijie Xu, Rajesh Kumar Singh, Jie Bao +1
The interphase mass transfer plays a critical role in determining the height of packed column used in the absorption process. In a recent experiment (Song D. Ind. Eng. Chem. Res. 2…
A Stochastic Analysis of Steady and Transient Heat Conduction in Random Media Using a Homogenization Approach
Zhijie Xu
We present a new stochastic analysis for steady and transient one-dimensional heat conduction problem based on the homogenization approach. Thermal conductivity is assumed to be a…
Simulation of Heterogeneous Atom Probe Tip Shapes Evolution during Field Evaporation Using a Level Set Method and Different Evaporation Models
Zhijie Xu, Dongsheng Li, Wei Xu +5
In atom probe tomography (APT), accurate reconstruction of the spatial positions of field evaporated ions from measured detector patterns depends upon a correct understanding of th…
Phonon excitation and energy redistribution in phonon space for energy transport in one-dimensional lattice with nonlinear dispersion
Zhijie Xu
We first propose fundamental solutions of wave propagation in one-dimensional dispersive chain subject to a localized initial perturbation in the displacement. Analytical solutions…
Modeling Selective Intergranular Oxidation of Binary Alloys
Zhijie Xu, Dongsheng Li, Daniel K. Schreiber +2
Intergranular attack of alloys under hydrothermal conditions is a complex problem that depends on metal and oxygen transport kinetics via solid-state and channel-like pathways to a…
Upscaling of Solute Transport in Heterogeneous Media with Non-uniform Flow and Dispersion Fields
Zhijie Xu, Paul Meakin
An analytical and computational model for non-reactive solute transport in periodic heterogeneous media with arbitrary non-uniform flow and dispersion fields within the unit cell o…
Phase field and level set methods for modeling solute precipitation and/or dissolution
Zhijie Xu, Hai Huang, Xiaoyi Li +1
The dynamics of solid-liquid interfaces controlled by solute precipitation and/or dissolution due to the chemical reaction at the interface were computed in two dimensions using a…
Metal Oxidation Kinetics and the Transition from Thin to Thick Films
Zhijie Xu, Kevin M. Rosso, Stephen Bruemmer
We report an investigation of growth kinetics and transition from thin to thick films during metal oxidation. In the thin film limit (< 20 nm), Cabrera and Mott's theory is usually…
A Reduced-Boundary-Function Method for Convective Heat Transfer with Axial Heat Conduction and Viscous Dissipation
Zhijie Xu
We introduce a new method of solution for the convective heat transfer under forced laminar flow that is confined by two parallel plates with a distance of 2a or by a circular tube…
Discrete-element model for the interaction between ocean waves and sea ice
Zhijie Xu, Alexandre M. Tartakovsky, Wenxiao Pan
We present a discrete element method (DEM) model to simulate the mechanical behavior of sea ice in response to ocean waves. The interaction of ocean waves and sea ice can potential…
A Generalized Kinetic Model for Heterogeneous Gas-Solid Reactions
Zhijie Xu, Xin Sun, Mohammad A Khaleel
We present a generalized kinetic model for gas-solid heterogeneous reactions taking place at the interface between two phases. The model studies the reaction kinetics by taking int…
Phase-field modeling of two-dimensional solute precipitation/dissolution: Solid fingers and diffusion-limited precipitation
Zhijie Xu, Paul Meakin
Two-dimensional dendritic growth due to solute precipitation was simulated using a phase-field model reported earlier [Z. Xu and P. Meakin, J. Chem. Phys. 129, 014705 (2008)]. It w…
A Generalized Mathematical Framework for Thermal Oxidation Kinetics
Zhijie Xu, Kevin M. Rosso, Stephen M. Bruemmer
We present a generalized mathematical model for thermal oxidation and the growth kinetics of oxide films. The model expands long-standing classical models by taking into account th…
A dissipative particle dynamics model of biofilm growth
Zhijie Xu, Paul Meakin, Alexandre Tartakovsky +1
A dissipative particle dynamics (DPD) model for the quantitative simulation of biofilm growth controlled by substrate (nutrient) consumption, advective and diffusive substrate tran…
A diffuse-interface model for smoothed particle hydrodynamics
Zhijie Xu, Paul Meakin, Alexandre Tartakovsky
Diffuse-interface theory provides a foundation for the modeling and simulation of microstructure evolution in a very wide range of materials, and for the tracking/capturing of dyna…
A phase field approach to no slip boundary conditions in dissipative particle dynamics and other particle models for fluid flow in geometrically complex confined systems
Zhijie Xu, Paul Meakin
Dissipative particle dynamics (DPD) is an effective mesoscopic particle model with a lower computational cost than molecular dynamics because of the soft potentials that it employs…
Thermally Activated Motion of Dislocations in Fields of Obstacles: Effect of Obstacle Distribution
Zhijie Xu, Catalin Picu
The thermally activated motion of dislocations across fields of obstacles distributed at random and in a correlated manner, in separate models, is studied by means of computer simu…
Method of model reduction and multifidelity models for solute transport in random layered porous media
Zhijie Xu, Alexandre M. Tartakovsky
This work presents a hierarchical model for solute transport in bounded layered porous media with random permeability. The model generalizes the Taylor-Aris dispersion theory to st…
Phase-field modeling of solute precipitation and dissolution
Zhijie Xu, Paul Meakin
A phase-field approach to the dynamics of liquid-solid interfaces that evolve due to precipitation and/or dissolution is presented. For the purpose of illustration and comparison w…
A Consistent Spatially Adaptive Smoothed Particle Hydrodynamics Method for Fluid-Structure Interactions
Wei Hu, Guannan Guo, Xiaozhe Hu +3
A new consistent, spatially adaptive, smoothed particle hydrodynamics (SPH) method for Fluid-Structure Interactions (FSI) is presented. The method combines several attributes that…