A 3D CFD study of homogeneous-catalytic combustion of hydrogen in a spiral microreactor

Yedala, Neha; Raghu, Aswathy K.; Kaisare, Niket S.

doi:10.1016/j.combustflame.2019.05.022

Cited by 28 publications

(10 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the chemical element “M” can be chosen any particle that removes excess energy from the resulting low‐active radical HO2. At low levels of temperature and pressure, these reactions basically bring to disconnection in the reaction chains 38 . All the chemical equations and reaction chain parameters are written in the CHEMKIN chemical mechanism file format and imported into ANSYS Fluent into the EDC calculation model.…”

Section: Computational Experiments On Combustion Of the Hydrogen‐oxyg...mentioning

confidence: 99%

Experimental and theoretical study of combustion efficiency of hydrogen‐oxygen mixture at pressure of 0.25 to 6.0 MPa

Aminov

Egorov

2022

Intl J of Energy Research

View full text Add to dashboard Cite

The paper presents the new results of experimental and theoretical studies of combustion processes in hydrogen-oxygen mixtures. Considered the impact of pressure in the combustion chamber on the efficiency of hydrogen fuel combustion. Experimental research results showed that the hydrogen content on the exit from the first and second sections of the experimental combustion chamber was 5.674% mass and 0.719% mass, respectively, at the pressure of 1.0 MPa. The proposed pressure range extension is based on computational experiments relating mathematical modeling of the processes occurring in the experimental setup, in particular, for the pressure in the combustion chamber and flame tube ranging from 0.25 to 6.0 MPa. The obtained results were verified. The accuracy in estimating the temperature of combustion products found due to the computational and physical experiments is in the range of 98.89%-102.37% at the outlet of the first section, and is in the range of 97.38%-97.86% at the outlet of the second section. Meanwhile, the accuracy in estimating the hydrogen underburning is in the range of 100.37%-101.53% at the outlet of the first section, and is in the range of 98.81%-99.05% at the outlet from the second section. Computational experiments show that an increase in the combustion products pressure leads to an increase in the combustion products temperature at the exit from the first section was within 1264 C-1713 C range, and on the exit from the second section was within 937 C-1386 C. It is shown that the recombination rate achieved in the experimental setup and computational experiments was 10.718 to 10.814 kg/(kgÁs) at the pressure from 0.25 to 6.0 MPa. In this case, the minimum time necessary to complete recombination of combustion products was 0.5478 to 0.55 s under given conditions of external cooling. The pressure range in the combustion chamber does not significantly affect the mass fraction unreacted hydrogen.

show abstract

Section: Computational Experiments On Combustion Of the Hydrogen‐oxyg...mentioning

confidence: 99%

Experimental and theoretical study of combustion efficiency of hydrogen‐oxygen mixture at pressure of 0.25 to 6.0 MPa

Aminov

Egorov

2022

Intl J of Energy Research

View full text Add to dashboard Cite

show abstract

“…This grid was found to provide grid-independent results and was used for further simulations. Since the model parameters and detailed procedure are presented in our previous works, , they are skipped here for brevity.…”

Section: Catalytic Microreactormentioning

confidence: 99%

Modeling of Thermal Integration of a Catalytic Microcombustor with a Thermoelectric for Power Generation Applications

Yedala

Kaisare

2021

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Power generation from coupled devices employing combustion in microreactors is generating interest for portable or decentralized energy demands. We develop a model framework to predict the performance of an integrated catalytic microreactor−thermoelectric generator (TEG) device, using CFD. A strategy for modeling a standalone TEG module is proposed and validated first, followed by thermally integrating it with a microreactor. The concepts of 1D global energy conservation with lumped treatment of the electrical properties are used to develop the TEG model. Multiple thermocouples, consisting of p-and n-type semiconductors connected in series, are modeled as a single block. The properties of the Seebeck coefficient, internal resistance, and thermal conductance are aggregated for the entire block and estimated as polynomial functions of temperature. These parameters can be estimated from manufacturer data. The source terms for Seebeck, Peltier, Thomson, and Joule's effects are incorporated into the energy conservation equation to model the TEG at steady state. The TEG model is validated with experiments in the literature. The catalytic combustion of hydrogen in a microreactor is validated independently and is subsequently used for modeling a catalytic microreactor integrated with a TEG module for power generation. The power extracted by various load resistances from the coupled device, at multiple values of inlet flow rates, is calculated and shows a good comparison with experimental data in the literature.

show abstract

“…The reaction mixture flowing in the channel can exchange heat with adjacent channels in co‐current mode. Spiral reactor was found to exhibit excess enthalpy and better stability compared with a straight channel reactor when applied for highly exothermic combustion reactions of propane 31 and hydrogen 32 . In this work, we analyze the operability of this reactor for the moderately exothermic Sabatier reaction.…”

Section: Introductionmentioning

confidence: 99%

A compact heat recirculating spiral geometry for thermal integration for Sabatier reaction in microreactor

Raghu

Kaisare

2022

AIChE Journal

Self Cite

View full text Add to dashboard Cite

Sabatier reaction, the catalytic reduction of CO 2 to methane, is a reversible and exothermic reaction that produces CO as a by-product. We use two-dimensional computational fluid dynamics (CFD) simulations to analyze the performance of a three-turn spiral microreactor, useful for portable or modular applications. Spiral reactor has inlet at the center followed by three turns that spirals outwards. It allows thermal integration via cocurrent self-coupling of Sabatier reaction, which enables utilizing the exothermic heat of methanation for preheating of the cold reactants by hot products. Due to compact nature of the geometry, heat released spreads out in the reactor causing an overall moderation of temperature. A favorable cooling effect is achieved in spiral geometry without using external cooling or feed dilution, merely by the property of reactor configuration.

show abstract

A 3D CFD study of homogeneous-catalytic combustion of hydrogen in a spiral microreactor

Cited by 28 publications

References 47 publications

Experimental and theoretical study of combustion efficiency of hydrogen‐oxygen mixture at pressure of 0.25 to 6.0 MPa

Experimental and theoretical study of combustion efficiency of hydrogen‐oxygen mixture at pressure of 0.25 to 6.0 MPa

Modeling of Thermal Integration of a Catalytic Microcombustor with a Thermoelectric for Power Generation Applications

A compact heat recirculating spiral geometry for thermal integration for Sabatier reaction in microreactor

Contact Info

Product

Resources

About