A5009219802- Groundwater flow and contamination studies
- Advanced Mathematical Modeling in Engineering
- Heat and Mass Transfer in Porous Media
- Lattice Boltzmann Simulation Studies
- Enhanced Oil Recovery Techniques
- Fluid Dynamics and Turbulent Flows
- Soil and Unsaturated Flow
- CO2 Sequestration and Geologic Interactions
- Composite Material Mechanics
- Electrostatics and Colloid Interactions
- Fecal contamination and water quality
- Particle Dynamics in Fluid Flows
- Stellar, planetary, and galactic studies
- Bacterial biofilms and quorum sensing
- Microfluidic and Bio-sensing Technologies
- Numerical methods in inverse problems
- Radioactive element chemistry and processing
- Astronomy and Astrophysical Research
- Geophysical and Geoelectrical Methods
- Wastewater Treatment and Nitrogen Removal
- NMR spectroscopy and applications
- Hydraulic Fracturing and Reservoir Analysis
- Granular flow and fluidized beds
- Advanced Thermodynamics and Statistical Mechanics
- Hydrocarbon exploration and reservoir analysis
Oregon State University
2015-2024
Keysight Technologies (United Kingdom)
2020
University of Michigan
2020
Corvallis Environmental Center
2020
California University of Pennsylvania
2012
Universidad Autónoma Metropolitana
2010-2011
Los Alamos National Laboratory
2010
University of California, Davis
1998-2003
U.S. Army Corp of Engineers Waterways Experiment Station
2002
Savannah Technical College
2002
Anion-exchange membrane water electrolysis (AEMWE) suffers from low performance compared with mainstream techniques. Attempts at improvement have been confined to the development of membranes and electrodes. Here, in quest increasing AEMWE, a well-designed liquid/gas-diffusion layer (LGDL), termed as NiMPL-PTL, was developed by introducing nickel-based microporous layers (MPLs) on top porous transport (PTL). The tortuosity this NiMPL-PTL reduced capillary pressure bubble point, which led...
Turbulent flows in porous media occur a wide variety of applications, from catalysis packed beds to heat exchange nuclear reactor vessels. In this review, we summarize the current state literature on methods model such flows. We focus range Reynolds numbers, covering inertial regime through asymptotic turbulent regime. The review emphasizes both numerical modeling and development averaged (spatially filtered) balances over representative volumes media. For pore scale, examine recent...
A numerical model based on smoothed particle hydrodynamics (SPH) was used to simulate reactive transport and mineral precipitation in porous fractured media. The stability accuracy of the SPH‐based verified by comparing its results with analytical finite element solutions. also performing simulations different time steps number particles (different resolutions). study effects Damkohler Peclet numbers pore‐scale heterogeneity character estimate effective reaction coefficients mass transfer...
Advective skew dispersion is a natural Markov process defined by diffusion with drift across an interface of jump discontinuity in piecewise constant coefficient. In the absence drift, this may be represented as function α-skew Brownian motion for uniquely determined value α=α∗; see Ramirez et al. [Multiscale Model. Simul. 5 (2006) 786–801]. present paper, analysis extended to case nonzero drift. A determination (joint) distributions key functionals standard together some associated...
A new method to resolve biofilms in three dimensions porous media using high‐resolution synchrotron‐based X‐ray computed microtomography (CMT) has been developed. Imaging without disturbing the natural spatial arrangement of medium and associated biofilm a challenging task, primarily because generally preclude conventional imaging via optical microscopy; tomography offers potential alternative. Using silver‐coated microspheres for contrast, we were able differentiate between biomass...
Search Bar to Enter New Query quick field: Author First Abstract Year Fulltext Select a field or operator abstract only acknowledgements affiliation arXiv category author count bibcode bibliographic group bib abbrev, e.g. ApJ body of article data archive collection citation doctype doi entdate first fulltext identifier inst keyword object orcid page property publication full name date published title volume year citations() pos() references() reviews() similar() topn() trending() useful()...
Abstract In this study we describe a scheme for numerically calculating the effective diffusivity of cellular systems such as biofilms and tissues. This work extends previous studies in which developed macroscale representations transport equations based on subcellular‐scale reaction processes. A finite‐difference model is used to predict system basis geometry parameters. The predicted complex three‐dimensional structure that laboratory observations biofilm, these numerical predictions are...
A stochastic‐convective reactive (SCR) transport method is developed for one‐dimensional steady in physically heterogeneous media with nonlinear degradation. The free of perturbation amplitude limitations and circumvents the difficulty scale dependence phenomenological parameters by avoiding volume‐averaged specifications diffusive/dispersive fluxes. system conceptualized as an ensemble independent convective‐reactive streamlines, each characterized a randomized convective velocity (or...
The representation of subsurface flow and reactive transport as an ensemble one‐dimensional stream tubes is extended to account for nonlinear biodegradation with coupled microbial growth. Stochastic‐convective reaction (SCR) model derived bioreaction a single solute by class microorganisms dynamic A new global variable, the integral degraded per unit length system traversed, accounts degradation. Dimensionless scaling method characteristics are used reduce model, written convecting reactor...
Carbon dioxide concentrations were measured at various depths and times in the unsaturated zones of two hydraulically geochemically contrasting field sites, one southeastern Washington state, other south central Saskatchewan. In situ CO 2 production rates calculated from a mass balance that accounted for diffusive fluxes partitioning into an advecting aqueous phase. Production compared with (1) microbial abundance (2) subsurface temperature to determine whether could be expressed as simple...
In this work, we use the method of volume averaging to determine effective dispersion tensor for a heterogeneous porous medium; closure averaged equation is obtained by solution concentration deviation over periodic unit cell. Our purpose show how with can be rectified results other upscaling methods under particular conditions. Although rectification something that generally believed true, there has been very little research explores issue explicitly. We certain limiting (but mild)...
In this work we develop the macroscale transport equation for dispersion of a nonreactive chemical species, with particular focus on influence inertial contributions at moderate Reynolds numbers. Our starting point is continuum level description written subpore scale. Volume averaging used to upscale these equations solute balance that applies Darcy We fully transient version ancillary closure problem predicts total tensor, and solve using finite Fourier transforms. The result effort...
The transport and biodegradation of an organic compound (quinoline) were studied in a meter‐scale system layered porous media. A two‐dimensional laboratory experiment was conducted saturated with two hydraulic layers ratio conductivities 1:13. solution containing dissolved quinoline injected as front at one end the system, aqueous‐phase concentrations quinoline, its first degradation product (2‐hydroxyquinoline), oxygen monitored over time several spatial locations. Results from set...