Effects of flow unsteadiness and chemical kinetics on the reaction yield in a T-microreactor

2022 ◽  
Author(s):  
A. Mariotti ◽  
M. Antognoli ◽  
C. Galletti ◽  
R. Mauri ◽  
M.V. Salvetti ◽  
...  
Keyword(s):  
Chemical Kinetics ◽  
Reaction Yield ◽  
Flow Unsteadiness

The role of flow features and chemical kinetics on the reaction yield in a T-shaped micro-reactor

2020 ◽  
Vol 396 ◽  
pp. 125223 ◽  
Author(s):  
Alessandro Mariotti ◽  
Matteo Antognoli ◽  
Chiara Galletti ◽  
Roberto Mauri ◽  
Maria Vittoria Salvetti ◽  
...  
Keyword(s):  
Chemical Kinetics ◽  
Reaction Yield ◽  
Flow Features ◽  
Micro Reactor

scholarly journals A Study on the Effect of Flow Unsteadiness on the Yield of a Chemical Reaction in a T Micro-Reactor

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 242 ◽  
Author(s):  
Alessandro Mariotti ◽  
Matteo Antognoli ◽  
Chiara Galletti ◽  
Roberto Mauri ◽  
Maria Vittoria Salvetti ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Laminar Flow ◽  
Chemical Reaction ◽  
Reaction Yield ◽  
Mixing Process ◽  
Strong Decrease ◽  
3 Dimensional ◽  
Flow Unsteadiness ◽  
Simple Geometry ◽  
Micro Reactor

Despite the very simple geometry and the laminar flow, T-shaped microreactors have been found to be characterized by different and complex steady and unsteady flow regimes, depending on the Reynolds number. In particular, flow unsteadiness modifies strongly the mixing process; however, little is known on how this change may affect the yield of a chemical reaction. In the present work, experiments and 3-dimensional numerical simulations are carried out jointly to analyze mixing and reaction in a T-shaped microreactor with the ultimate goal to investigate how flow unsteadiness affects the reaction yield. The onset of the unsteady asymmetric regime enhances the reaction yield by more than 30%; however, a strong decrease of the yield back to values typical of the vortex regime is observed when the flow undergoes a transition to the unsteady symmetric regime.

Refinement of state-resolved models for chemical kinetics using the data of trajectory calculations

2018 ◽  
Vol 19 (3) ◽  
pp. 1-14 ◽  
Author(s):  
Elena V. Kustova ◽  
◽  
Aleksei S. Savelev ◽  
Anastasia A. Lukasheva ◽  
◽  
...  
Keyword(s):  
Chemical Kinetics ◽  
Trajectory Calculations

WET BURNING – THE MODERN TREND IN ENVIRONMENTAL BENIGN FUEL COMBUSTION AND IN SOLUTION TO THE PROBLEM OF SUSTAINABLE DEVELOPMENT OF THE POWER GENERATION

2018 ◽  
pp. 96-117 ◽  
Author(s):  
B. S. Soroka
Keyword(s):  
Numerical Simulation ◽  
Nitrogen Oxides ◽  
Chemical Kinetics ◽  
Fuel Combustion ◽  
Transport Processes ◽  
Cfd Modeling ◽  
Furnace Chamber ◽  
Modern Trend ◽  
Atmospheric Air ◽  
No Formation

The article considers the role and place of water and water vapor in combustion processes with the purpose of reduction the effluents of nitrogen oxides and carbon oxide. We have carried out the complex of theoretical and computational researches on reduction of harmful nitrogen and carbon oxides by gas fuel combustion in dependence on humidity of atmospheric air by two approaches: CFD modeling with attraction of DRM 19 chemical kinetics mechanism of combustion for 19 components along with Bowman’s mechanism used as “postprocessor” to determine the [NO] concentration; different thermodynamic models of predicting the nitrogen oxides NO formation. The numerical simulation of the transport processes for momentum, mass and heat being solved simultaneously in the united equations’ system with the chemical kinetics equations in frame of GRI methane combustion mechanism and NO formation calculated afterwards as “postprocessor” allow calculating the absolute actual [CO] and [NO] concentrations in dependence on combustion operative conditions and on design of furnace facilities. Prediction in frame of thermodynamic equilibrium state for combustion products ensures only evaluation of the relative value of [NO] concentration by wet combustion the gas with humid air regarding that in case of dry air – oxidant. We have developed the methodology and have revealed the results of numerical simulation of impact of the relative humidity of atmospheric air on harmful gases formation. Range of relative air humidity under calculations of atmospheric air under impact on [NO] and [CO] concentrations at the furnace chamber exit makes φ = 0 – 100%. The results of CFD modeling have been verified both by author’s experimental data and due comparing with the trends stated in world literature. We have carried out the complex of the experimental investigations regarding atmospheric air humidification impact on flame structure and environmental characteristics at natural gas combustion with premixed flame formation in open air. The article also proposes the methodology for evaluation of the nitrogen oxides formation in dependence on moisture content of burning mixture. The results of measurements have been used for verification the calculation data. Coincidence of relative change the NO (NOx) yield due humidification the combustion air revealed by means of CFD prediction has confirmed the qualitative and the quantitative correspondence of physical and chemical kinetics mechanisms and the CFD modeling procedures with the processes to be studied. A sharp, more than an order of reduction in NO emissions and simultaneously approximately a two-fold decrease in the CO concentration during combustion of the methane-air mixture under conditions of humidification of the combustion air to a saturation state at a temperature of 325 K.

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