Current research
Modeling, design and analysis of PEMFC
Fuel cells are continuous batteries that run on hydrogen or conventional
hydrocarbons. They produce electricity more efficiently and quietly than
conventional fossil fuel burners and have high power densities (in units of
W/cm3). For improved design and control of fuel cells, better
understanding is necessary of fuel cell systems and components by means
of experimentally-validated accurate models of the transport phenomena,
structural and thermal behavior of fuel cells. We have two and three
dimensional transient and steady-state models of PEM fuel cells.
Hydrogen (left) and Oxygen
(right) mass fractions in anode (left) and cathode (right) flow channels and
gas diffusion layers obtained by 3D modeling of a U-section of PEM fuel cell by
COMSOL.
Projects
- Sabanci University Internatl Grant: IACF04-00221 (June
04-June 06)
- TUBITAK 104M136 (June 05- June 08)
- TUBITAK 109M105 (Dec 09 - Dec 12)
Publications
- S. Yesilyurt, "Modeling and Simulations of PEM Fuel Cesll with
Poroelastic Approach for Coupled Liquid Water Transport and Deformation in
the Membrane," Journal
of Fuel Cell Science Technology, 7 (3), 031008-031017, 2010.
- J.B. Siegel, S.B. Bohac,
A.G. Stefanopoulou, S. Yesilyurt, “Nitrogen front evolution in purged
polymer electrolyte membrane fuel cell dead-ended anode,”J.
Electrochem. Soc., 157, B1081, 2010.
- J.B. Siegel, A.G.
Stefanopoulou, S. Yesilyurt, “Reduced complexity models for water
management and anode purge scheduling in DEA operation PEMFCs,” ECS Trans., 33(1), 1583,
2010.
- J.B. Siegel, A.G.
Stefanopoulou, S. Yesilyurt, “Modeling and simulations of PEMFCs operating
with periodically purged dead-ended anode channels,” Eights Int. Fuel Cell Science,
Eng. and Tech. Conf., FuelCell2010, Brooklyn, New York, USA, June 2010.
- J. B. Siegel,
A.G.Stefanopoulou, S. Yesilyurt, “Extracting model parameters and
paradigms from neutron imaging of dead-ended anode operation,” Seventh Int. Fuel Cell
Science, Eng. and Tech. Conf., FuelCell2009, Newport Beach, CA, June 2009.
- J.B. Siegel, A.G.
Stefanopoulou, S. Yesilyurt, “Effects of nitrogen and water accumulation
in the dead-ended anode operation of PEM fuel cells,” In 215th Electrochem. Soc. Meeting,
359, 2009.
- S. Yesilyurt, “Modeling
and simulations of deformation and transport in PEM fuel cells,” Sixth Int. Fuel Cell Science,
Engineering and Technology Conference (FuelCell08), Denver,Colorado, USA, ASME, June
2008.
- S. Yesilyurt, “Three
dimensional simulations of transient response of PEM fuel cells,” ASME Int. Mechanical Eng.
Congress and Exhibition, Seattle,
USA, ASME, November, 2007.
- M.F. Serincan, S.
Yesilyurt, “Transient analysis of Proton Electrolyte Membrane Fuel Cells
(PEMFC) at Startup and Failure”, Fuel
Cells, 7(2), 118-127,
2007.
- M.F. Serincan, S.
Yesilyurt, “Modeling Transients of a Proton Electrolyte Membrane Fuel Cell
(PEMFC),” Proceedings
International Hydrogen Energy Congress and Exhibition IHEC 2005 , Istanbul, Turkey, 13-15 July
2005.
- M.F. Serincan, S.
Yesilyurt, “Modeling Transient Water Transport in a Proton Electrolyte
Membrane Fuel Cells (PEMFC) with Interdigitated Flow Fields,” Proceedings International
Hydrogen Energy Congress and Exhibition IHEC 2005 , Istanbul, Turkey, 13-15 July
2005.
- M.F. Serincan, S.
Yesilyurt,”An Analysis of a Proton Electrolyte Membrane Fuel Cell (PEMFC)
at Start-ups and Failures” Lucerne Fuel Cell Forum 2005, 4-8 July
2005.
Design of Bio-Inspired Micro Swimming Robots for Medical
Tasks
Microscopic
devices that can be used in diagnostic tasks and minimally invasive surgical
applications are the subject of an extremely popular research and development
activities which attract attention from researchers, policy makers, investors
and the public. The success of these devices relies on a multidisciplinary
approach that must bring together biology, mechanics, electronics and materials
research.
We aim to design and demonstrate a biologically-inspired propulsion mechanism
that uses a traveling planar-wave actuator, which does not cause excessive
waste, heat, and mechanical stress within the human body. We have
two and three dimensional models of micropumps that use traveling-plane waves
as a pumping mechanism, and three-dimensional transient model of an autonomous
swimmer that propels itself with the traveling-plane waves on its tail.
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3D swimming capsule and the
pressure field created near the tail (left); pressure (color shade) and flow
field (velocity arrows) created by traveling-plane waves on a thin-film strip
in a 3D rectangular channel (right).
Projects
- Sabanci University Internatl Grant: (Sept 07-Sept 09)
- TUBITAK 111M376 (Jan 12 - Jan 14)
- OPEN POSITIONS: MS/PhD
students
Publications
- A.F. Tabak, S. Yesilyurt, “Validated reduced order
models for simulating trajectories of bio-inspired artificial
micro-swimmers,” Third
Joint US-European Fluids Engineering Summer Meeting and Eighth Int. Conf.
on Nanochannels, Microchannels and Minichannels (FEDSM2010-ICNMM2010), 2010.
- A.F. Tabak, S.Yesilyurt,
“Modeling and simulations of the motion of bio-inspired micro swimming
robots,” NEMB2010: Proc.
of the ASME First Global Congress on Nanoengineering for Medicine and
Biology-2010, 2010.
- M. Koz, S. Yesilyurt,
“Simulation-based analysis of the micropropulsion with rotating corkscrew
motion of flagella,” ASME
2009 Fluids Engineering Div. Summer Mtg., (FEDSM09) Aug. 2-6, 2009, Vail,
Colorado, USA, 2009.
- A.F. Tabak, S.
Yesilyurt, “Simulation-based analysis of flow due to traveling-plane-wave
deformations on elastic thin-film actuators in micropumps”, Microfluidics and
Nanofluidics,vol 4, no 6, pp 489-500, 2008.
- M. Koz, S. Yesilyurt,
“Simulations of microflows induced by rotation of spirals in
microchannels,” Proc. of
SPIE, vol 6886, Microfluidics, BioMEMS, and
Medical Microsystems VI, ed. Wang, Wanjun, Vauchier, Claude, Jan. 2008.
- M. Koz, S. Yesilyurt,
“Simulation-based analysis of a biologically-inspired micropump with a
rotating spiral inside a microchannel,” 6th
Int. Conf. on Nanochannels, Microchannels and Minichannels, Darmstadt, Germany, ASME,
June 2008.
- A. F. Tabak, A. Solak,
E. Y. Erdem, C. Akcan, S. Yesilyurt, "Simulation-based analysis of 3D
flow inside a micropump with passive valves," ASME Int.
Mechanical Eng. Congress and Exhibition, Seattle,
USA, ASME, November,
2007.
- A. F. Tabak, S.
Yesilyurt, "Numerical analysis of planar wave propagation based
micropropulsion system," ASME Int. Mechanical Eng. Congress
and Exhibition, Seattle,
USA, ASME, November,
2007.
- A.F. Tabak, S.
Yesilyurt, "Numerical Analysis of the 3D Flow Induced by
Propagationon of Plane-Wave Deformations on Thin MembraneS Inside
Microchannels", Proceedings
of the 5th International
Conference on Nanochannels, Microchannels & Minichannels, ICNMM2007, Puebla, Mexico, June 18-20,
2007.
- A.F. Tabak, S.
Yesilyurt, “Numerical simulations and analysis of a micropump actuated by
traveling plane waves” SPIE-Photonics
West, MOEMS-MEMS, San
Jose, 20-25 Jan. 2007.
- A.F. Tabak, S.
Yesilyurt, “Numerical Simulations of a Traveling Plane-Wave Actuator for
Microfluidic Applications, Proceedings
of the COMSOL Users Conference, Boston,
October 22-24, 2006, ed. Jeri’Ann Hiller, ISBN 0-9766792-2-1.