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1. Brownian Dynamics simulations of shear-induced aggregation of charged colloidal particles in the presence of hydrodynamic interactions

Author:
Turetta Lorenzo; Lattuada Marco
Source:
Journal of colloid and interface science 2022 pp. -
ISSN:
0021-9797
Subject:
Peclet number,   etc   ; energy; hydrodynamics; molecular dynamics;     Show all 4 Subjects
Abstract:
... Hypothesis In spite of the abundant literature on Brownian simulations of the aggregation behavior of colloidal suspensions both under quiescent conditions and in the presence of shear, few works performed simulations including the effect of hydrodynamic interactions. Even fewer works have investigated the effects of shear on the aggregation of electrostatically-stabilized colloidal suspensions. S ...
DOI:
10.1016/j.jcis.2022.05.047

2. Practical drying model for horizontal colloidal films in rapid evaporation processes

Author:
Taehyung Yoo; Byoungjin Chun; Hyun Wook Jung
Source:
Drying technology 2022 v.40 no.3 pp. 516-526
ISSN:
1532-2300
Subject:
Peclet number,   etc   ; diffusivity; evaporation; models; technology;     Show all 5 Subjects
Abstract:
... A practical drying model is developed for horizontal colloidal films with the vertical particle distribution in the film determined by the Peclet number (Pe). The Pe is defined as the ratio between the evaporation speed () and the colloidal diffusion () at the initial wet film thickness (). The model incorporates the effect of Pe on the temporal particle distribution into the collective diffusivit ...
DOI:
10.1080/07373937.2020.1811723

3. Enhanced Electroosmotic Mixing in a Wavy Micromixer Using Surface Charge Heterogeneity

Author:
Sumit Kumar Mehta; Sukumar Pati
Source:
Industrial & engineering chemistry process design and development 2022 v.61 no.7 pp. 2904-2914
ISSN:
1520-5045
Subject:
Peclet number,   etc   ; electric field; electroosmosis; equations; finite element analysis; momentum; process design; zeta potential;     Show all 8 Subjects
Abstract:
... We investigate the flow and mixing characteristics for an electroosmotic flow through a wavy micromixer using surface charge heterogeneity. The Laplace equation for the external electric field, Poisson–Boltzmann equation for potential distribution, and continuity and momentum equations for fluid flow and species transport equation have been solved by imposing the appropriate boundary conditions us ...
DOI:
10.1021/acs.iecr.1c04318

4. Experimental and numerical study of catalytic combustion and pore-scale numerical study of mass diffusion in high porosity fibrous porous media

Author:
Mohammadmehdi Namazi; Mohammadreza Nayebi; Amin Isazadeh; Ali Modarresi; Iman Ghasemi Marzbali; Seyed Mostafa Hosseinalipour
Source:
Energy 2022 v.238 pp. 121831
ISSN:
0360-5442
Subject:
Peclet number,   etc   ; combustion; diffusivity; energy; geometry; heat transfer; methane; permeability; porosity; porous media; temperature;     Show all 11 Subjects
Abstract:
... Pore structure has a significant effect on transport phenomena inside porous media. This effect can be considered in simulations by using suitable transport coefficients. Some correlations are reported in the literature, which can be applied for simple pore geometries. In the present study, a pore-scale simulation approach is presented to determine mass diffusion coefficient considering molecular ...
DOI:
10.1016/j.energy.2021.121831

5. Investigations on cellularization instability of 2-ethylfuran

Author:
Cangsu Xu; Weinan Liu; Francis Oppong; Qianwen Wang; Zuo-Yu Sun; Xiaolu Li
Source:
Renewable energy 2022 v.191 pp. 447-458
ISSN:
0960-1481
Subject:
Peclet number,   etc   ; biofuels; combustion; hydrodynamics; topography;     Show all 5 Subjects
Abstract:
... 2-ethylfuran (2 EF) has potential as a biofuel for combustion devices. To apply it efficiently in combustion devices, it is necessary to study the combustion characteristics such as the intrinsic flame instability of 2 EF. The intrinsic flame instabilities of 2 EF outwardly propagating spherical premixed flames were theoretically and experimentally studied at initial temperatures of 373, 403, and ...
DOI:
10.1016/j.renene.2022.04.068

6. Numerical investigation of the solute dispersion in finite‐length microchannels with the interphase transport

Author:
Wenbo Li; Wenyao Zhang; Fang Qian; Deng Huang; Qiuwang Wang; Cunlu Zhao
Source:
Electrophoresis 2021 v.42 no.3 pp. 257-268
ISSN:
0173-0835
Subject:
Peclet number,   etc   ; electrophoresis; interphase; solutes; statistical analysis;     Show all 5 Subjects
Abstract:
... This paper utilizes a combined approach of the convection‐diffusion theory and the moment analysis to conduct a comprehensive investigation of the solute dispersion under the influence of the interphase transport in finitely long inner coated microchannels. The present work has threefold novel contributions: (1) The 2D solute concentration contours in the stationary phase are calculated for the fi ...
DOI:
10.1002/elps.202000141

7. Colloid transport through a variable-aperture fracture under unfavorable attachment conditions: Characterization with a continuous time random walk model

Author:
Lizhi Zheng; Lichun Wang; Scott C. James; Constantinos V. Chrysikopoulos
Source:
Colloids and surfaces 2022 v.644 pp. 128822
ISSN:
0927-7757
Subject:
Peclet number,   etc   ; Reynolds number; advection; equations; models; prediction;     Show all 6 Subjects
Abstract:
... Although the effects of fracture aperture variability on colloid advection and dispersion are well understood, how aperture variability affects colloid deposition under unfavorable geochemical conditions remains underexplored. To address this knowledge gap, we simulated 6200 cases of colloid transport in variable-aperture fractures with different magnitudes of fracture aperture variability and cor ...
DOI:
10.1016/j.colsurfa.2022.128822

8. Mixing performance analysis of non-cohesive particles in a double paddle blender using DEM and experiments

Author:
Behrooz Jadidi; Mohammadreza Ebrahimi; Farhad Ein-Mozaffari; Ali Lohi
Source:
Powder technology 2022 v.397 pp. 117122
ISSN:
0032-5910
Subject:
Peclet number,   etc   ; angle of repose; equations; impellers; technology; temperature;     Show all 6 Subjects
Abstract:
... Discrete element method (DEM) and statistical analysis were employed to analyze the flow patterns and mixing mechanisms of a double paddle blender. The scarcity of analysis of mixing performance of this kind of blender in literature motivated the authors to conduct this research. The DEM input parameters were calibrated using an experimentally measured dynamic angle of repose. It was found that th ...
DOI:
10.1016/j.powtec.2022.117122

9. Microbial carriers promote and guide pyrene migration in sediments

Author:
Youda Huang; Bin Wang; Yonggang Yang; Shan Yang; Meijun Dong; Meiying Xu
Source:
Journal of hazardous materials 2022 v.424 pp. 127188
ISSN:
0304-3894
Subject:
Peclet number,   etc   ; adsorption; biomechanics; environmental assessment; models; risk; sediment-water interface; sulfides;     Show all 8 Subjects
Abstract:
... Microbial carriers may co-transport polycyclic aromatic hydrocarbons (PAHs), but lack substantial experimental evidence. Cable bacteria use gliding or twitching motility to access sulfide; hence, they could be important microbial carriers in co-transporting PAHs from the sediment-water interface into suboxic zones. In this study, the effect of cable bacteria on pyrene migration was investigated by ...
DOI:
10.1016/j.jhazmat.2021.127188

10. Effect of soil textural characteristics on longitudinal dispersion in saturated porous media

Author:
Mojtaba G. Mahmoodlu; Amir Raoof; Martinus Th. van Genuchten
Source:
Journal of hydrology and hydromechanics 2021 v.69 no.2 pp. 161-170
ISSN:
1338-4333
Subject:
Peclet number,   etc   ; calcium; dispersibility; equations; particle size; porosity; sand; soil; solutes; steady flow;     Show all 10 Subjects
Abstract:
... This study focuses on the effects of soil textural heterogeneity on longitudinal dispersion under saturation conditions. A series of solute transport experiments were carried out using saturated soil columns packed with two filter sands and two mixtures of these sands, having d₅₀ values of 95, 324, 402, and 480 µm, subjected to four different steady flow rates. Values of the dispersion coefficient ...
DOI:
10.2478/johh-2021-0004

11. Hyporheic transverse mixing zones and dispersivity: Laboratory and numerical experiments of hydraulic controls

Author:
Erich T. Hester; Katherine Y. Santizo; Abenezer A. Nida; Mark A. Widdowson
Source:
Journal of contaminant hydrology 2021 v.243 pp. 103885
ISSN:
0169-7722
Subject:
Peclet number,   etc   ; advection; dyes; groundwater; hyporheic zone; sand; solutes; surface water; water quality;     Show all 9 Subjects
Abstract:
... Mixing of surface water and groundwater in shallow sediments is important to biogeochemical cycling and contaminant migration, and is often used to define the hyporheic zone. Yet knowledge of mixing processes in hyporheic zones is supported by surprisingly few rigorous lab or field observations, and differ from those in deeper groundwater by presence of enhanced head gradients, sediment heterogene ...
DOI:
10.1016/j.jconhyd.2021.103885

12. The Role of Mixed Convection and Hydrodynamic Dispersion During CO2 Dissolution in Saline Aquifers: A Numerical Study

Author:
Avihai Tsinober; Ravid Rosenzweig; Holger Class; Rainer Helmig; Uri Shavit
Source:
Water resources research 2022 v.58 no.3 pp. e2021WR030494
ISSN:
0043-1397
Subject:
Peclet number,   etc   ; aqueous solutions; aquifers; carbon dioxide; convection; hydrodynamic dispersion; porous media; research; water;     Show all 9 Subjects
Abstract:
... Dissolution trapping plays a significant role in CO₂ geological storage. When CO₂ dissolves in aquifer brines, the aqueous solution is heavier than the underlying resident brine. This results in convective instability in the form of CO₂‐rich fingers, which accelerates dissolution. It was recently shown that background flow affects CO₂ dissolution by suppressing the development of convective finger ...
DOI:
10.1029/2021WR030494

13. Novel regimes of calcium carbonate dissolution in micron-scale confined spaces

Author:
Jianping Xu; Matthew T. Balhoff
Source:
Advances in water resources 2022 v.164 pp. 104200
ISSN:
0309-1708
Subject:
Peclet number,   etc   ; calcium carbonate; carbon dioxide; carbon sequestration; hydrochloric acid; liquids; oil fields; water;     Show all 8 Subjects
Abstract:
... We report the discovery of novel regimes of calcium carbonate dissolution in micron-scale confined spaces through microfluidic experiments. In the experiments, hydrochloric acid is injected into a microfluidic chamber with pre-deposited calcium carbonate solids. As the acid flow rate is decreased, the dissolution of calcium carbonate transits from a liquid/solid single-phase reactive transport reg ...
DOI:
10.1016/j.advwatres.2022.104200

14. Semi-analytical solution for reactive contaminant transport in a filled-fractured system with intervening rock matrices: Case examples of tritium and uranium

Author:
Abolfazl Rezaei; Mohammad Pirvand
Source:
Journal of hydrology 2022 v.608 pp. 127642
ISSN:
0022-1694
Subject:
Peclet number,   etc   ; advection; dispersibility; groundwater; groundwater contamination; groundwater flow; hydrodynamic dispersion; porosity; remediation; solutes; tritium; uranium;     Show all 12 Subjects
Abstract:
... While fractures are commonly filled in the subsurface, they have received little attention in terms of flow and solute transport. This study presents a semi-analytical solution for a reactive contaminant in a five-layer fracture-matrix groundwater system characterized by a thin rock matrix separating the fractures, which are taken to be filled with sediments. Under conditions of steady groundwater ...
DOI:
10.1016/j.jhydrol.2022.127642

15. Analytical solutions of advection-dispersion-reaction equation with first decay under constant and time-dependent boundary conditions: Mass transfer shape factor effects

Author:
Mahdi Abbasi; Mohammad Madani; Mohammad Sharifi; Alireza Kazemi
Source:
Groundwater for sustainable development 2021 v.15 pp. 100691
ISSN:
2352-801X
Subject:
Peclet number,   etc   ; computer simulation; convection; equations; groundwater; mass transfer; mathematical models; porosity; porous media; solutes; sustainable development;     Show all 11 Subjects
Abstract:
... To describe the combined dispersion and convection mechanisms of solute transport through porous media, one may typically refer to the advection-dispersion equation (ADE). In this study, a generalized analytical solution to the ADE combined with first order decay term is derived for the problem of solute transport through porous media in one-dimensional finite region considering transient boundary ...
DOI:
10.1016/j.gsd.2021.100691

16. Upscaling Reactive Transport Under Hydrodynamic Slip Conditions in Homogeneous Porous Media

Author:
Francisco J. Valdés‐Parada; Didier Lasseux; Stephen Whitaker
Source:
Water resources research 2020 v.56 no.1 pp. e2019WR025954
ISSN:
0043-1397
Subject:
Peclet number,   etc   ; dispersibility; equations; hydrodynamics; porous media; research; water;     Show all 7 Subjects
Abstract:
... Reactive transport of a dilute species in a Newtonian fluid saturating a homogeneous porous medium for slip flow is analyzed in this work. Incompressible Newtonian flow with a first‐order (Navier) slip boundary condition is considered together with a first‐order heterogeneous reaction. Kinetic numbers range up to unity while Knudsen numbers, characteristic of slip‐flow, are smaller than approximat ...
DOI:
10.1029/2019WR025954

17. Brownian sieving enhancement of microcapillary hydrodynamic chromatography. Analysis of the separation performance based on Brenner’s macro-transport theory

Author:
Valentina Biagioni; Alpha L. Sow; Antonio G. Fagiolo; Alessandra Adrover; Stefano Cerbelli
Source:
Journal of chromatography 2021 v.1659 pp. 462652
ISSN:
0021-9673
Subject:
Peclet number,   etc   ; analytical chemistry; chromatography; equations; geometry; hydrodynamics; statistics;     Show all 7 Subjects
Abstract:
... In a recent article [Analytical Chemistry, 93(17), 6808–6816 (2021)], an unconventional device configuration enforcing a Brownian sieving mechanism was proposed as proof of concept for the efficient implementation of microcapillary hydrodynamic chromatography (MHDC). In this article, we perform a thorough analysis of the device geometry and of operating conditions, in order to single out the optim ...
DOI:
10.1016/j.chroma.2021.462652

18. On Solving Groundwater Flow and Transport Models with Algebraic Multigrid Preconditioning

Author:
M. Adil Sbai; A. Larabi
Source:
Ground water 2021 v.59 no.1 pp. 100-108
ISSN:
0017-467X
Subject:
Peclet number,   etc   ; anisotropy; equations; groundwater; groundwater flow; hydrologic models;     Show all 6 Subjects
Abstract:
... Iterative solvers preconditioned with algebraic multigrid have been devised as an optimal technology to speed up the response of large sparse linear systems. In this work, this technique was implemented in the framework of the dual delineation approach. This involves a single groundwater flow linear solution and a pure advective transport solution with different right‐hand sides. The new solver wa ...
DOI:
10.1111/gwat.13016

19. Gas hydrodynamics of a novel MTO high-speed loop reactor: The bypassing and backmixing along with average residence time

Author:
Fenfen Wang; Shihan Ma; Jiajia Wen; Chenglin E.; Chunxi Lu
Source:
Powder technology 2020 v.364 pp. 1062-1075
ISSN:
0032-5910
Subject:
Peclet number,   etc   ; alkenes; cold; fluidized beds; hydrodynamics; methanol; models; powders;     Show all 8 Subjects
Abstract:
... Methanol to olefins (MTO) is an attractive technique. In order to optimize the hydrodynamics of gas-solid phase and the olefins yield and selectivity, a novel MTO high-speed loop reactor (HSLR) is developed. The gas hydrodynamics of bypassing, backmixing and average residence time are explored in a large scale cold model setup. In addition, comparison between the gas backmixing as well as gas resi ...
DOI:
10.1016/j.powtec.2019.09.032

20. A parsimonious approach for large-scale tracer test interpretation

Author:
Vincent Bailly-Comte; Séverin Pistre
Source:
Hydrogeology journal 2021 v.29 no.4 pp. 1539-1550
ISSN:
1431-2174
Subject:
Peclet number,   etc   ; aquifers; dyes; karsts; pollution; spring; tracer techniques; watersheds;     Show all 8 Subjects
Abstract:
... Dye tracing is an efficient method for spring watershed delineation, but is also used in surface waters to assess pollution migration over several kilometers. The aim of this study is to develop a simple and parsimonious approach that accounts for a linear relationship between dispersivity and scale that could be used for the simulation of large-scale transport processes in aquifers. The analysis ...
DOI:
10.1007/s10040-021-02327-x