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Randall S. Gemmen
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Proceedings Papers

Application of a New CFD Analysis Tool for SOFC Technology

Michael T. Prinkey, Randall S. Gemmen, William A. Rogers
Proc. ASME. IMECE2001, Heat Transfer: Volume 4 — Combustion and Energy Systems, 291-300, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/HTD-24270
https://doi.org/10.1115/IMECE2001/HTD-24270
View Paper titled, Application of a New CFD Analysis Tool for SOFC Technology
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Topics: Computational fluid dynamics, Solid oxide fuel cells, Fuel cells, Overvoltage, Geometry, Electric potential, Electrochemistry, Flow (Dynamics), Steady state, Temperature
Proceedings Papers

Analysis for the Effect of Inverter Ripple Current on Fuel Cell Operating Condition

Randall S. Gemmen
Proc. ASME. IMECE2001, Heat Transfer: Volume 4 — Combustion and Energy Systems, 279-289, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/HTD-24269
https://doi.org/10.1115/IMECE2001/HTD-24269
View Paper titled, Analysis for the Effect of Inverter Ripple Current on Fuel Cell Operating Condition
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Topics: Fuel cells, Stress, Electrodes, Boundary-value problems, Diffusion (Physics), Dynamic models, Dynamics (Mechanics), Modeling, Transients (Dynamics)
Proceedings Papers

Transient Modeling Results of a Methane-Steam Prereformer

Eric A. Liese, Randall S. Gemmen
Proc. ASME. IMECE2000, Advanced Energy Systems, 277-282, November 5–10, 2000
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2000-1319
https://doi.org/10.1115/IMECE2000-1319
View Paper titled, Transient Modeling Results of a Methane-Steam Prereformer
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Topics: Methane, Modeling, Steam, Transients (Dynamics), Catalysts, Flow (Dynamics), Heat, Particulate matter, Temperature, Geometry
Proceedings Papers

Achieving Improved Cycle Efficiency via Pressure Gain Combustors

Randall S. Gemmen, Michael C. Janus, George A. Richards, Thomas S. Norton, William A. Rogers
Proc. ASME. GT1995, Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations, V003T06A007, June 5–8, 1995
Publisher: American Society of Mechanical Engineers
Paper No: 95-GT-063
https://doi.org/10.1115/95-GT-063
View Paper titled, Achieving Improved Cycle Efficiency via Pressure Gain Combustors
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Topics: Combustion chambers, Cycles, Pressure, Combustion systems, Gas turbines, Emissions, Nitrogen oxides, Pollution
Proceedings Papers

Technical Development Issues and Dynamic Modeling of Gas Turbine and Fuel Cell Hybrid Systems

Eric A. Liese, Randall S. Gemmen, Faryar Jabbari, Jacob Brouwer
Proc. ASME. GT1999, Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations, V002T02A062, June 7–10, 1999
Publisher: American Society of Mechanical Engineers
Paper No: 99-GT-360
https://doi.org/10.1115/99-GT-360
View Paper titled, Technical Development Issues and Dynamic Modeling of Gas Turbine and Fuel Cell Hybrid Systems
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Topics: Dynamic modeling, Fuel cells, Gas turbines, Reliability, Simulation, Steam, Dynamic models, Fuels, Methane, Safety
Proceedings Papers

Development of Dynamic Modeling Tools for Solid Oxide and Molten Carbonate Hybrid Fuel Cell Gas Turbine Systems

Randall S. Gemmen, Eric Liese, Jose G. Rivera, Faryar Jabbari, Jacob Brouwer
Proc. ASME. GT2000, Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations, V002T02A068, May 8–11, 2000
Publisher: American Society of Mechanical Engineers
Paper No: 2000-GT-0554
https://doi.org/10.1115/2000-GT-0554
View Paper titled, Development of Dynamic Modeling Tools for Solid Oxide and Molten Carbonate Hybrid Fuel Cell Gas Turbine Systems
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Topics: Dynamic modeling, Fuel cells, Gas turbines, Solid oxide fuel cells, Reliability, Simulation, Dynamic models, Dynamic response, Molten carbonate fuel cells, Steady state
Proceedings Papers

Performance Comparison of Internal Reforming Against External Reforming in a SOFC, Gas Turbine Hybrid System

Eric A. Liese, Randall S. Gemmen
Proc. ASME. GT2003, Volume 3: Turbo Expo 2003, 305-310, June 16–19, 2003
Publisher: American Society of Mechanical Engineers
Paper No: GT2003-38566
https://doi.org/10.1115/GT2003-38566
View Paper titled, Performance Comparison of Internal Reforming Against External Reforming in a SOFC, Gas Turbine Hybrid System
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Topics: Gas turbines, Solid oxide fuel cells, Fuel cells, Air flow, Cooling, Flow (Dynamics), Waste heat
Proceedings Papers

Inter-Laboratory Dynamic Modeling of a Carbonate Fuel Cell for Hybrid Application

Rory A. Roberts, Faryar Jabbari, Jacob Brouwer, Randall S. Gemmen, Eric A. Liese
Proc. ASME. GT2003, Volume 2: Turbo Expo 2003, 565-572, June 16–19, 2003
Publisher: American Society of Mechanical Engineers
Paper No: GT2003-38774
https://doi.org/10.1115/GT2003-38774
View Paper titled, Inter-Laboratory Dynamic Modeling of a Carbonate Fuel Cell for Hybrid Application
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Topics: Dynamic modeling, Fuel cells, Dynamic response, Simulation, Gas turbines, Reliability, Computer software, Design, Dynamic models, Flow (Dynamics)
Proceedings Papers

Dynamic Modeling Results of a 1MW Molten Carbonate Fuel Cell/Gas Turbine Power System

Eric Liese, Randall S. Gemmen
Proc. ASME. GT2002, Volume 2: Turbo Expo 2002, Parts A and B, 341-349, June 3–6, 2002
Publisher: American Society of Mechanical Engineers
Paper No: GT2002-30110
https://doi.org/10.1115/GT2002-30110
View Paper titled, Dynamic Modeling Results of a 1MW Molten Carbonate Fuel Cell/Gas Turbine Power System
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Topics: Dynamic modeling, Gas turbines, Molten carbonate fuel cells, Power systems (Machinery), Air flow, Anodes, Dynamic systems, Fuel cells, Fuels, Hybrid power systems
Proceedings Papers

Validation and Application of a CFD-Based Model for Solid Oxide Fuel Cells and Stacks

William A. Rogers, Randall S. Gemmen, Christopher Johnson, Michael Prinkey, Mehrdad Shahnam
Proc. ASME. FUELCELL2003, 1st International Fuel Cell Science, Engineering and Technology Conference, 517-520, April 21–23, 2003
Publisher: American Society of Mechanical Engineers
Paper No: FUELCELL2003-1762
https://doi.org/10.1115/FUELCELL2003-1762
View Paper titled, Validation and Application of a CFD-Based Model for Solid Oxide Fuel Cells and Stacks
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Topics: Computational fluid dynamics, Solid oxide fuel cells, Flow (Dynamics), Fuel cells, Electrodes, Electrolytes, Anodes, Chemistry, Collaboration, Computer software
Proceedings Papers

Assessing the Impact of Inverter Current-Ripple on SOFC Performance

Randall S. Gemmen, Parviz Famouri, Christopher Johnson
Proc. ASME. FUELCELL2003, 1st International Fuel Cell Science, Engineering and Technology Conference, 385-393, April 21–23, 2003
Publisher: American Society of Mechanical Engineers
Paper No: FUELCELL2003-1744
https://doi.org/10.1115/FUELCELL2003-1744
View Paper titled, Assessing the Impact of Inverter Current-Ripple on SOFC Performance
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Topics: Solid oxide fuel cells, Fuel cells, Electrodes, Stress, Boundary-value problems, Dynamics (Mechanics), Electrolytes, Steady state, Transients (Dynamics)
Proceedings Papers

Dynamic Simulation of Carbonate Fuel Cell-Gas Turbine Hybrid Systems

Rory A. Roberts, Jack Brouwer, Eric Liese, Randall S. Gemmen
Proc. ASME. GT2004, Volume 7: Turbo Expo 2004, 389-397, June 14–17, 2004
Publisher: American Society of Mechanical Engineers
Paper No: GT2004-53653
https://doi.org/10.1115/GT2004-53653
View Paper titled, Dynamic Simulation of Carbonate Fuel Cell-Gas Turbine Hybrid Systems
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Topics: Design, Dynamic analysis, Emissions, Flexible systems, Fossil fuels, Fuel cells, Fuels, Gas turbines, Molten carbonate fuel cells, Simulation
Proceedings Papers

Fuel Cell Performance Improvements Using Cell-to-Cell Flow Distribution Control

J. Peter Hensel, Randall S. Gemmen, Brian J. Hetzer, Jimmy D. Thornton, Jeffrey S. Vipperman, William W. Clark, A. Fatih Ayhan
Proc. ASME. FUELCELL2004, 2nd International Conference on Fuel Cell Science, Engineering and Technology, 283-290, June 14–16, 2004
Publisher: American Society of Mechanical Engineers
Paper No: FUELCELL2004-2482
https://doi.org/10.1115/FUELCELL2004-2482
View Paper titled, Fuel Cell Performance Improvements Using Cell-to-Cell Flow Distribution Control
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Topics: Flow (Dynamics), Fuel cells, Fuels, Needle valves, Proton exchange membrane fuel cells, Stress, Valves
Proceedings Papers

Dynamics of Solid Oxide Fuel Cell Operation

Randall S. Gemmen, Christopher D. Johnson
Proc. ASME. FUELCELL2004, 2nd International Conference on Fuel Cell Science, Engineering and Technology, 229-238, June 14–16, 2004
Publisher: American Society of Mechanical Engineers
Paper No: FUELCELL2004-2475
https://doi.org/10.1115/FUELCELL2004-2475
View Paper titled, Dynamics of Solid Oxide Fuel Cell Operation
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Topics: Dynamics (Mechanics), Solid oxide fuel cells, Stress, Cross-flow, Flow (Dynamics), Fuel cells, Geometry, Reliability, Transients (Dynamics)
Proceedings Papers

Development of Controls for Dynamic Operation of Carbonate Fuel Cell-Gas Turbine Hybrid Systems

Rory A. Roberts, Jack Brouwer, Eric Liese, Randall S. Gemmen
Proc. ASME. GT2005, Volume 5: Turbo Expo 2005, 325-331, June 6–9, 2005
Publisher: American Society of Mechanical Engineers
Paper No: GT2005-68774
https://doi.org/10.1115/GT2005-68774
View Paper titled, Development of Controls for Dynamic Operation of Carbonate Fuel Cell-Gas Turbine Hybrid Systems
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Topics: Fuels, Gas turbines, Molten carbonate fuel cells, Simulation, Turbines, Fuel cells, Emissions, Flow (Dynamics), Temperature, Compressors
Proceedings Papers

A Dynamic Bulk SOFC Model Used in a Hybrid Turbine Controls Test Facility

Eric A. Liese, Randall S. Gemmen, Thomas P. Smith, Comas L. Haynes
Proc. ASME. GT2006, Volume 4: Cycle Innovations; Electric Power; Industrial and Cogeneration; Manufacturing Materials and Metallurgy, 117-126, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-90383
https://doi.org/10.1115/GT2006-90383
View Paper titled, A Dynamic Bulk SOFC Model Used in a Hybrid Turbine Controls Test Facility
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Topics: Solid oxide fuel cells, Test facilities, Turbines, Fuel cells, Control equipment, Dynamic models, Fuels, Gas turbines, Pressure, Valves
Proceedings Papers

Thermal Gradient Induced Current Recirculation on Load Change in Solid Oxide Fuel Cells

Randall S. Gemmen, Christopher D. Johnson
Proc. ASME. FUELCELL2006, ASME 2006 Fourth International Conference on Fuel Cell Science, Engineering and Technology, Parts A and B, 691-699, June 19–21, 2006
Publisher: American Society of Mechanical Engineers
Paper No: FUELCELL2006-97187
https://doi.org/10.1115/FUELCELL2006-97187
View Paper titled, Thermal Gradient Induced Current Recirculation on Load Change in Solid Oxide Fuel Cells
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Topics: Solid oxide fuel cells, Stress, Temperature gradient, Anodes, Flow (Dynamics), Cross-flow, Durability, Fuel cells, Transients (Dynamics)
Proceedings Papers

A Modular Approach to Fuel Cell Modeling: Analysis of a SOFC Cathode

Ismail B. Celik, Randall S. Gemmen, Suryanarayana R. Pakalapati
Proc. ASME. IMECE2002, Advanced Energy Systems, 155-163, November 17–22, 2002
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2002-33181
https://doi.org/10.1115/IMECE2002-33181
View Paper titled, A Modular Approach to Fuel Cell Modeling: Analysis of a SOFC Cathode
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Topics: Fuel cells, Modeling analysis, Solid oxide fuel cells, Modeling, Current density, Electric fields, Electric potential, Manufacturing, Oxygen, Resolution (Optics)
Proceedings Papers

Fuel Cell Gas Turbine Hybrid Simulation Facility Design

David Tucker, Eric Liese, John VanOsdol, Larry Lawson, Randall S. Gemmen
Proc. ASME. IMECE2002, Advanced Energy Systems, 183-190, November 17–22, 2002
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2002-33207
https://doi.org/10.1115/IMECE2002-33207
View Paper titled, Fuel Cell Gas Turbine Hybrid Simulation Facility Design
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Topics: Design, Fuel cells, Gas turbines, Simulation, Transients (Dynamics), Stress, Steady state, Dynamics (Mechanics), Risk, Test facilities
Proceedings Papers

A Novel Piezoelectrically Actuated Microvalve for Flow Control in a PEM Fuel Cell

Jeffrey S. Vipperman, A. Fatih Ayhan, William W. Clark, Jimmy D. Thornton, Randall S. Gemmen
Proc. ASME. IMECE2002, Microelectromechanical Systems, 497-505, November 17–22, 2002
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2002-39320
https://doi.org/10.1115/IMECE2002-39320
View Paper titled, A Novel Piezoelectrically Actuated Microvalve for Flow Control in a PEM Fuel Cell
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Topics: Axial flow, Design, Flow (Dynamics), Flow control, Fuel cell applications, Fuel cells, Geometry, Manufacturing, Matlab, Proton exchange membrane fuel cells