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An experimental and numerical investigation of the combustion and heat transfer characteristics of hydrogen-fueled catalytic microreactors

Sui, Ran and Prasianakis, Nikolas and Mantzaras, John and Mallya, Nithin and Theile, Jürgen and Lagrange, Damien and Friess, Martin (2016) An experimental and numerical investigation of the combustion and heat transfer characteristics of hydrogen-fueled catalytic microreactors. Chemical Engineering Science (141), pp. 214-230. Elsevier. ISSN 0009-2509

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Official URL: http://www.elsevier.com/locate/ces

Abstract

The combustion and heat transfer characteristics of a hydrogen-fueled microreactor are investigated experimentally and numerically. The microreactor comprises a 30×30×4 mm3 SiC-block equipped with six 1.5 mm diameter platinum channels. Combustion of fuel-lean H2/air mixtures at equivalence ratios φ=0.25−0.50 and inlet velocities 15–50 m/s is studied at coflow and counterflow configurations. Surface temperatures are measured with an infrared camera, while simulations are carried out with a 3D code that includes conjugate heat transfer, appropriate external heat losses, and detailed hetero-/homogeneous chemistry. Higher mass throughputs reduce the surface temperature spatial non-uniformities, while the onset of gaseous combustion lowers the catalyst surface temperatures and is thus detrimental for power generation applications. Four different channel configurations are tested for optimum temperature uniformity. Counterflow configurations are shown superior to the coflow configuration in attaining better surface temperature uniformities with standard deviations less than 19 K and maximum surface temperatures up to 1311 K. Comparisons of measurements and predictions are very favorable in terms of temperature probability density function (PDF) shapes and higher distribution moments. Counterflow configurations yield narrower PDFs slightly skewed to the low temperatures, while the coflow configuration yields mostly bimodal shapes. Radiation efficiencies increase with increasing inlet velocity and equivalence ratio. Application of the microreactor to power generation systems, in conjunction with thermoelectric devices, appears quite promising given the attained good spatial uniformity and the high values of surface temperatures.

Item URL in elib:https://elib.dlr.de/100838/
Document Type:Article
Title:An experimental and numerical investigation of the combustion and heat transfer characteristics of hydrogen-fueled catalytic microreactors
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sui, RanPaul Scherrer Institute, Combustion Research, CH-5232 Villigen PSI, SwitzerlandUNSPECIFIED
Prasianakis, NikolasPaul Scherrer Institute, Combustion Research, CH-5232 Villigen PSI, SwitzerlandUNSPECIFIED
Mantzaras, JohnPaul Scherrer Institute, Combustion Research, CH-5232 Villigen PSI, SwitzerlandUNSPECIFIED
Mallya, NithinPaul Scherrer Institute, Combustion Research, CH-5232 Villigen PSI, SwitzerlandUNSPECIFIED
Theile, JürgenPaul Scherrer Institute, Combustion Research, CH-5232 Villigen PSI, SwitzerlandUNSPECIFIED
Lagrange, DamienMicrocertec, Pae de Lamirault-Collegien, 22 rue de Lamirault, 77090 Collegien, FranceUNSPECIFIED
Friess, MartinGerman Aerospace Center, Institute of Structures and Design, Pfaffenwaldring 38-40, 70569 Stuttgart, GermanyUNSPECIFIED
Date:2016
Journal or Publication Title:Chemical Engineering Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Page Range:pp. 214-230
Publisher:Elsevier
ISSN:0009-2509
Status:Published
Keywords:Hydrogen-fueled catalytic microreactor; Platinum catalyst; Three-dimensional modeling with conjugate heat transfer; Surface temperature probability density functions; Reactor optimization and radiation efficiency
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:other (old)
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Materials for Energy Technology (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Friess, Dr.rer.nat. Martin
Deposited On:15 Jan 2016 10:48
Last Modified:10 May 2016 23:38

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