Damköhler numbers
View article: Numerical Simulation for Bioconvection Radiative Peristaltic Flow of Eyring‐Powell Nanomaterial
Numerical Simulation for Bioconvection Radiative Peristaltic Flow of Eyring‐Powell Nanomaterial Open
Improving heat transfer in biomedical liquid flows plays a crucial role in enhancing the performance of medical devices, targeted drug delivery systems, and thermal treatment techniques. This research tackles the drawbacks of traditional f…
View article: Parametrizing the mixing by clear air turbulence in the chemistry climate model EMAC and its respective radiative impact
Parametrizing the mixing by clear air turbulence in the chemistry climate model EMAC and its respective radiative impact Open
The Earth’s radiation budget is found to be sensitive to changes in the upper troposphere/lower stratosphere(UTLS) chemical composition. Stratosphere-troposphere exchange is the major process that influences the UTLS chemical composition w…
View article: Flame Stabilisation Mechanism for Single and Multiple Jets in Cross-flow Using the Conditional Moment Closure
Flame Stabilisation Mechanism for Single and Multiple Jets in Cross-flow Using the Conditional Moment Closure Open
View article: Extinction of Opposed Flame Spread and Regression Burning of Thick Solid Fuels
Extinction of Opposed Flame Spread and Regression Burning of Thick Solid Fuels Open
There are several flammability markers associated with solid combustible materials, although extinction is a critical one once a fire has ignited. The determination of the extinction of a material is often based on the oxygen volume fracti…
View article: Minimum Ignition Energy Density of Premixed NH<sub>3</sub>–H<sub>2</sub> Counterflow Flames
Minimum Ignition Energy Density of Premixed NH<sub>3</sub>–H<sub>2</sub> Counterflow Flames Open
To provide more insight into the spark ignition process of ammonia under complex conditions, this study numerically investigates the effects of spark width (δw), spark duration (τs), pressure, hydrogen (H2)…
View article: On the Generation of Entropy Waves in the Dilution Zone of a Rich-Quench-Lean Combustion Chamber
On the Generation of Entropy Waves in the Dilution Zone of a Rich-Quench-Lean Combustion Chamber Open
Entropy waves are responsible for the generation of indirect combustion noise and risk to enhance combustion instabilities. Their prediction and modeling, especially in non-premixed flames, is challenging which gives the necessity of exper…
View article: Hydrophilic OrganicCompound Migration in Biochar-AmendedStormwater Filters with Dynamic Conditions and Varied Background DissolvedOrganic Carbon Contents
Hydrophilic OrganicCompound Migration in Biochar-AmendedStormwater Filters with Dynamic Conditions and Varied Background DissolvedOrganic Carbon Contents Open
Urban stormwater runoff carries dissolved, hydrophilic urban pollutants into surface waters and aquifers, impairing human and aquatic health and threatening beneficial stormwater uses, such as augmentation of drinking water supplies. Black…
View article: Particle-ResolvedCFD Simulation of Diluted CatalyticFixed Bed Reactors for Formaldehyde Production
Particle-ResolvedCFD Simulation of Diluted CatalyticFixed Bed Reactors for Formaldehyde Production Open
In catalytic fixed bed reactors for highly exothermic reactions, the bed is often diluted with inert particles to prevent thermal runaway and to distribute the reaction more homogeneously along the reactor length. The partial oxidation of …
View article: Direct Observations of Solute Dispersion in Rocks With Distinct Degree of Sub‐Micron Porosity
Direct Observations of Solute Dispersion in Rocks With Distinct Degree of Sub‐Micron Porosity Open
The transport of chemical species in rocks is affected by their structural heterogeneity to yield a wide spectrum of local solute concentrations. To quantify such imperfect mixing, advanced methodologies are needed that augment the traditi…
View article: SULFIDE TEXTURES AND ORE GRADES IN MINERALIZED CARBONATES DEPEND ON PÉCLET AND DAMKÖHLER NUMBERS
SULFIDE TEXTURES AND ORE GRADES IN MINERALIZED CARBONATES DEPEND ON PÉCLET AND DAMKÖHLER NUMBERS Open
Clastic-dominated (CD-type) deposits contain a significant proportion of the global resources of Zn, Pb, and Ag, and include some of the largest deposits that formed through subseafloor replacement. Mineralization textures in these deposit…
View article: A new single-step mechanism for hydrogen combustion
A new single-step mechanism for hydrogen combustion Open
International audience
View article: Sensitivity Analysis of One-Dimensional Multiphysics Simulation of CO<sub>2</sub> Electrolysis Cell
Sensitivity Analysis of One-Dimensional Multiphysics Simulation of CO<sub>2</sub> Electrolysis Cell Open
Electrochemical (EC) carbon dioxide (CO2) reduction, where CO2 is converted to value-added products such as fuel precursors, plays a key role in helping the world's energy system reach net-zero carbon emissions. Simul…
View article: Evaluation of numerical modeling and combustion characteristics of hydrogen oxy-fuel combustion in a semi-industrial furnace
Evaluation of numerical modeling and combustion characteristics of hydrogen oxy-fuel combustion in a semi-industrial furnace Open
The use of hydrogen (H2) in oxy-fuel combustion (OFC) systems is a promising concept for future high-temperature industries. However, the current literature lacks a comprehensive study on the numerical modeling aspects and the relevant fla…
View article: Modified Reacting Solver: A Simplified Approach for Capturing the Molecular and Flow Diffusivities for the Nonpremixed MILD Flames
Modified Reacting Solver: A Simplified Approach for Capturing the Molecular and Flow Diffusivities for the Nonpremixed MILD Flames Open
The present study investigates the applicability of the inlet boundary species Lewis number (combined effect of molecular and flow diffusion) for the nonpremixed moderate and intense low oxygen dilution (MILD) flames. A modified reactive s…
View article: Mathematical modelling of a slow flameless combustion of a two-dimensional paper
Mathematical modelling of a slow flameless combustion of a two-dimensional paper Open
We present a mathematical model for the slow combustion (smoldering) of a two-dimensional sheet of paper. We describe the evolution of the char region, and we investigate the effects of an orthogonal air flow on the shape of the combustion…
View article: Magnetized Flow of Maxwell Fluid over a Slippery Stretching Reactive Surface with Thermophoretic Deposition
Magnetized Flow of Maxwell Fluid over a Slippery Stretching Reactive Surface with Thermophoretic Deposition Open
This manuscript investigated mathematically magnetized Maxwell fluid over slippery stretching reactive surface with thermophoretic deposition. Similarity transformation was used to recast partial differential equations modeling flow proble…
View article: A Generalised Series Model for the LES of Premixed and Non-Premixed Turbulent Combustion
A Generalised Series Model for the LES of Premixed and Non-Premixed Turbulent Combustion Open
In this study, the generality and prediction accuracy of a generalised series model for the large eddy simulation of premixed and non-premixed turbulent combustion is explored. The model is based on the Taylor series expansion of the chemi…
View article: Isolating effects of large and small scale turbulence on thermodiffusively unstable premixed hydrogen flames
Isolating effects of large and small scale turbulence on thermodiffusively unstable premixed hydrogen flames Open
Lean turbulent premixed hydrogen/air flames have substantially increased flame speeds, commonly attributed to differential diffusion effects. In this work, the effect of turbulence on lean hydrogen combustion is studied through Direct Nume…
View article: A Generalised Series Model for LES of Premixed and Non-Premixed Turbulent Combustion
A Generalised Series Model for LES of Premixed and Non-Premixed Turbulent Combustion Open
In this study, the generality and prediction accuracy of a generalised series model for large eddy simulation of premixed and non-premixed turbulent combustion is explored. The model is based on Taylor series expansion of the chemical sour…
View article: Understanding the effects of forced and bubble-induced convection in transport-limited organic electrosynthesis
Understanding the effects of forced and bubble-induced convection in transport-limited organic electrosynthesis Open
Organic electrosynthesis offers a sustainable path to decarbonize the chemical industry by integrating renewable energy into chemical manufacturing. However, achieving the selectivity and energy efficiency required for industrial applicati…
View article: Implications of Reynolds Averaging for Reactive Tracers in Turbulent Flows
Implications of Reynolds Averaging for Reactive Tracers in Turbulent Flows Open
RANS simulations have been broadly used to investigate turbulence in the oceans and atmosphere. Within these environments there are a multitude of tracers undergoing reactions (e.g., phytoplankton growth, chemical reactions). The distribut…
View article: Implications of Reynolds Averaging for Reactive Tracers in Turbulent Flows
Implications of Reynolds Averaging for Reactive Tracers in Turbulent Flows Open
RANS simulations have been broadly used to investigate turbulence in the oceans and atmosphere. Within these environments there are a multitude of tracers undergoing reactions (eg. phytoplankton growth, chemical reactions). The distributio…
View article: Numerical investigation on the use of Dimethyl Ether (DME) as an alternative fuel for compression-ignition engines
Numerical investigation on the use of Dimethyl Ether (DME) as an alternative fuel for compression-ignition engines Open
View article: Mist Generation Behavior in Ultrasonic Atomizer for Aerosol Jet Printing
Mist Generation Behavior in Ultrasonic Atomizer for Aerosol Jet Printing Open
Continuous ultrasonic atomization in a closed chamber is expected to generate a mist with an equilibrium droplet concentration and size distribution. Such a mist of microdroplets with controllable mist density has been used for Aerosol Jet…
View article: Brief research report optimization of catalyst porosity arrangements for hydrogen production in microchannel reactors by methanol reforming
Brief research report optimization of catalyst porosity arrangements for hydrogen production in microchannel reactors by methanol reforming Open
Optimization of catalyst porosity arrangements is carried out for hydrogen production through computational modeling of a thermally integrated microchannel reactor. The reactor has parallel flow channels for conducting simultaneous oxidati…
View article: Mass transfer in catalytic depolymerization: External effectiveness factors and serendipitous processivity in stagnant and stirred melts
Mass transfer in catalytic depolymerization: External effectiveness factors and serendipitous processivity in stagnant and stirred melts Open
View article: Numerical modeling of reactive flow in porous media at the pore scale
Numerical modeling of reactive flow in porous media at the pore scale Open
Different numerical algorithms for the solution of a class of unsteady convection‐diffusion‐reaction (CDR) equations are presented and compared in this paper. The fully implicit in time discretizations are usually preferred because they ar…
View article: Modelling challenges of volume-averaged combustion in inert porous media
Modelling challenges of volume-averaged combustion in inert porous media Open
View article: Effects of Spatiotemporal Upscaling on Predictions of Reactive Transport in Porous Media
Effects of Spatiotemporal Upscaling on Predictions of Reactive Transport in Porous Media Open
The typical temporal resolution used in modern simulations significantly exceeds characteristic time scales at which the system is driven. This is especially so when systems are simulated over time-scales that are much longer than the typi…
View article: Multiscale simulation on electrochemical CO<sub>2</sub>reduction in gas-diffusion-electrode-based flow electrolyzer
Multiscale simulation on electrochemical CO<sub>2</sub>reduction in gas-diffusion-electrode-based flow electrolyzer Open
To respond to the goal of "carbon peaking and carbon neutrality", this paper establishes a multiphysics macroscopic model of a flow electrolyzer based on a gas diffusion electrode in the context of electrocatalytic CO 2 reduction and combi…