Optimization of a new flow design for solid oxide cells using computational fluid dynamics modelling

Jakob Dragsbæk Duhn, Anker Degn Jensen, Stig Wedel, Christian Wix

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Design of a gas distributor to distribute gas flow into parallel channels for Solid Oxide Cells (SOC) is optimized, with respect to flow distribution, using Computational Fluid Dynamics (CFD) modelling. The CFD model is based on a 3d geometric model and the optimized structural parameters include the width of the channels in the gas distributor and the area in front of the parallel channels. The flow of the optimized design is found to have a flow uniformity index value of 0.978. The effects of deviations from the assumptions used in the modelling (isothermal and non-reacting flow) are evaluated and it is found that a temperature gradient along the parallel channels does not affect the flow uniformity, whereas a temperature difference between the channels does. The impact of the flow distribution on the maximum obtainable conversion during operation is also investigated and the obtainable overall conversion is found to be directly proportional to the flow uniformity. Finally the effect of manufacturing errors is investigated. The design is shown to be robust towards deviations from design dimensions of at least ±0.1 mm which is well within obtainable tolerances.
Original languageEnglish
JournalJournal of Power Sources
Volume336
Pages (from-to)261-271
ISSN0378-7753
DOIs
Publication statusPublished - 2016

Keywords

  • Solid oxide cell
  • Flow distribution
  • Fuel utilization rate
  • Planar fuel cells
  • Geometry optimization
  • Parallel channels

Cite this

@article{b753925db4194d90aca68e9b81d07cae,
title = "Optimization of a new flow design for solid oxide cells using computational fluid dynamics modelling",
abstract = "Design of a gas distributor to distribute gas flow into parallel channels for Solid Oxide Cells (SOC) is optimized, with respect to flow distribution, using Computational Fluid Dynamics (CFD) modelling. The CFD model is based on a 3d geometric model and the optimized structural parameters include the width of the channels in the gas distributor and the area in front of the parallel channels. The flow of the optimized design is found to have a flow uniformity index value of 0.978. The effects of deviations from the assumptions used in the modelling (isothermal and non-reacting flow) are evaluated and it is found that a temperature gradient along the parallel channels does not affect the flow uniformity, whereas a temperature difference between the channels does. The impact of the flow distribution on the maximum obtainable conversion during operation is also investigated and the obtainable overall conversion is found to be directly proportional to the flow uniformity. Finally the effect of manufacturing errors is investigated. The design is shown to be robust towards deviations from design dimensions of at least ±0.1 mm which is well within obtainable tolerances.",
keywords = "Solid oxide cell, Flow distribution, Fuel utilization rate, Planar fuel cells, Geometry optimization, Parallel channels",
author = "Duhn, {Jakob Dragsb{\ae}k} and Jensen, {Anker Degn} and Stig Wedel and Christian Wix",
year = "2016",
doi = "10.1016/j.jpowsour.2016.10.060",
language = "English",
volume = "336",
pages = "261--271",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

}

Optimization of a new flow design for solid oxide cells using computational fluid dynamics modelling. / Duhn, Jakob Dragsbæk; Jensen, Anker Degn; Wedel, Stig; Wix, Christian.

In: Journal of Power Sources, Vol. 336, 2016, p. 261-271.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Optimization of a new flow design for solid oxide cells using computational fluid dynamics modelling

AU - Duhn, Jakob Dragsbæk

AU - Jensen, Anker Degn

AU - Wedel, Stig

AU - Wix, Christian

PY - 2016

Y1 - 2016

N2 - Design of a gas distributor to distribute gas flow into parallel channels for Solid Oxide Cells (SOC) is optimized, with respect to flow distribution, using Computational Fluid Dynamics (CFD) modelling. The CFD model is based on a 3d geometric model and the optimized structural parameters include the width of the channels in the gas distributor and the area in front of the parallel channels. The flow of the optimized design is found to have a flow uniformity index value of 0.978. The effects of deviations from the assumptions used in the modelling (isothermal and non-reacting flow) are evaluated and it is found that a temperature gradient along the parallel channels does not affect the flow uniformity, whereas a temperature difference between the channels does. The impact of the flow distribution on the maximum obtainable conversion during operation is also investigated and the obtainable overall conversion is found to be directly proportional to the flow uniformity. Finally the effect of manufacturing errors is investigated. The design is shown to be robust towards deviations from design dimensions of at least ±0.1 mm which is well within obtainable tolerances.

AB - Design of a gas distributor to distribute gas flow into parallel channels for Solid Oxide Cells (SOC) is optimized, with respect to flow distribution, using Computational Fluid Dynamics (CFD) modelling. The CFD model is based on a 3d geometric model and the optimized structural parameters include the width of the channels in the gas distributor and the area in front of the parallel channels. The flow of the optimized design is found to have a flow uniformity index value of 0.978. The effects of deviations from the assumptions used in the modelling (isothermal and non-reacting flow) are evaluated and it is found that a temperature gradient along the parallel channels does not affect the flow uniformity, whereas a temperature difference between the channels does. The impact of the flow distribution on the maximum obtainable conversion during operation is also investigated and the obtainable overall conversion is found to be directly proportional to the flow uniformity. Finally the effect of manufacturing errors is investigated. The design is shown to be robust towards deviations from design dimensions of at least ±0.1 mm which is well within obtainable tolerances.

KW - Solid oxide cell

KW - Flow distribution

KW - Fuel utilization rate

KW - Planar fuel cells

KW - Geometry optimization

KW - Parallel channels

U2 - 10.1016/j.jpowsour.2016.10.060

DO - 10.1016/j.jpowsour.2016.10.060

M3 - Journal article

VL - 336

SP - 261

EP - 271

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -