Ahmed F. Ghoniem
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Efficient Computation of Radiative Heat Recovery from Porous Ceramic Monoliths for Efficient Solar Thermochemical Fuel Production Open
Solar thermochemical hydrogen (STCH) produced by heat-driven water-splitting is a promising route for producing green hydrogen and other zero-emission synfuels. However, the efficiency of STCH must be dramatically increased for it to make …
Methane Assisted Chemical Looping Water Splitting Performance of Sr2FeMo0.6Ni0.4O6-δ Double Perovskite for Solar Fuels Production Open
In this work, we performed a preliminary investigation on the redox behaviour of Sr2FeMo0.6Ni0.4O6-δ (SFMN) double perovskite in H2-H2O and CH4-H2O redox cycles in order to explore the potential use of this oxide as an Oxygen Carrier (OC) …
Impact of Oxygen Enrichment and CO2-H2O Dilution on Stability and Pollutant Emissions of Non-Premixed Swirling Turbulent Flames Open
The aim of this work is to investigate the effect of exhaust gas recirculation (EGR: water vapor and CO 2 ), with and without O 2 enrichment, on non-premixed turbulent flames stabilized on a swirl burner. The motivations include CO 2 captu…
Swirl-counter-swirl microjets for thermoacoustic instability suppression Open
Combustor. The combustor includes an axially symmetric tube along with means for introducing fuel and air into the tube. A swirler is disposed within the tube to impart rotation in a first direction to the air/fuel mixture. A plurality of …
Partitioning of a wide bubbling fluidized bed with vertical internals to improve local mixing and bed material circulation Open
Industrial scale fluidized bed reactors are characterized by limited mixing rates, either local or global, especially when using low-pressure drop gas distributors to reduce operational costs. In this work, partitioning of wide beds using …
Kinetics mechanism of inert and oxidative torrefaction of biomass Open
Torrefaction of biomass is a promising pre-treatment process capable of substantially improving the properties of raw biomass for its use as a solid biofuel, among many other potential applications. Oxygen-lean torrefaction can effectively…
View article: Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes
Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes Open
Mixed ionic‐electronic conducting (MIEC) membranes have gained growing interest recently for various promising environmental and energy applications, such as H 2 and O 2 production, CO 2 reduction, O 2 and H 2 separation, CO 2 separation, …
Impact of a Centerbody on the Unsteady Flow Dynamics of a Swirl Nozzle: Intermittency of Precessing Vortex Core Oscillations Open
The precessing vortex core (PVC) is a self-excited flow oscillation state occurring in swirl nozzles. This is caused by the presence of a marginally unstable hydrodynamic helical mode that induces precession of the vortex breakdown bubble …
The Impact of Critical Operational Parameters on the Performance of the Aluminum Anode Baking Furnace Open
Minimizing energy consumption and reducing pollutant emissions during the carbon anode baking process are critically important for the aluminum industry. The present study investigates the effects of oxidizer inlet temperature, inlet oxyge…
Effective Start-Up and Shutdown Strategies for Continuously Operated Biomass Torrefaction Reactor Open
In this study, we analyze experimental time series temperature data and infer the transient behaviors of the test reactor, as well as how it changes with reactor scaling.We show that the thermal mass of the reactor has a significant part t…
Characterization of aggregate behaviors of torrefied biomass as a function of reaction severity Open
Several studies have shown that torrefaction can improve various characteristics of biomass, including grindability, flowability, and energy density, at least at the microscopic level. Furthermore, the improvements are often represented as…
New concepts for large-scale integration of biomass gasification with concentrated solar energy for renewable energy carriers Open
The interest and possibilities of conducting steam gasification of biomass (SGB) assisted by concentrated solar energy (CSE) at high temperature as external heat source for applications at large scale is studied.First the different options…
Design and cost analysis of perovskite oxygen permeable membrane reactors for hydrogen and syngas co-production Open
Dense oxygen permeable membrane supported water splitting is a potential technology for high purity hydrogen production.It utilizes thermochemical energy to split water to hydrogen with the membrane separating the products so that the wate…
In situ catalyst exsolution on perovskite oxides for the production of CO and synthesis gas in ceramic membrane reactors Open
This work demonstrates and assesses the concept of in situ catalyst exsolution in ceramic membrane reactors for the co-production of carbon monoxide (CO) and syngas through carbon dioxide (CO[subscript 2]) splitting and methane (CH[subscri…
Helical vortex core dynamics and flame interaction in turbulent premixed swirl combustion: A combined experimental and large eddy simulation investigation Open
In this study, a combined experimental and Large Eddy Simulation (LES) investigation is performed to identify the vortical structures, their dynamics, and interaction with a turbulent premixed flame in a swirl-stabilized combustor. Our non…
Multi-objective Optimization of Aluminum Anode Baking Process Employing a Response Surface Methodology Open
In the aluminum anode baking furnace, the operational parameters have a significant influence on the furnace performance and the resulting anode quality. For this furnace, an important parameter is the fire-cycle, which determines the prod…
<i>In situ</i> catalyst exsolution on perovskite oxides for the production of CO and synthesis gas in ceramic membrane reactors Open
In situ exsolution of nickel nano-particles on both sides of ceramic membrane reactors to accelerate the co-production of CO and synthesis gas through CO2 splitting and CH4 partial oxidation, respectively.
Ultra-lean hydrogen-enriched oscillating flames behind a heat conducting bluff-body: Anomalous and normal blow–off Open
This paper presents a numerical study of ultra-lean hydrogen-methane flames stabilized behind a rectangular, highly conducting metallic bluff body acting as a flame holder. Using high fidelity numerical simulations, we show that lean inver…
Role of hydrodynamic shear layer stability in driving combustion instability in a premixed propane-air backward-facing step combustor Open
With numerical methods and analysis of existing experimental results we show that combustion instability in a backward-facing step combustor can be maintained either with weak coupling between acoustic and hydrodynamic modes (semi-open loo…