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Keywords: mass transfer
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Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2020, 17(4): 041010.
Paper No: JEECS-19-1135
Published Online: April 8, 2020
... mass transfer coefficients through limiting current measurements. Finally, we combine these findings to develop power law relations between relevant dimensional and dimensionless quantities and to calculate extensive mass transfer coefficients. These studies reveal nuanced relationships between...
Includes: Supplementary data
Journal Articles
Article Type: Research-Article
J. Electrochem. En. Conv. Stor. November 2018, 15(4): 041008.
Paper No: JEECS-17-1070
Published Online: May 7, 2018
... density is increased. For this reason, it can be observed that performance in terms of electric potential decreases at high current density due to oxygen starvation (mass transfer limitation). An additional polarization curve is therefore provided under differential conditions with λ...
Journal Articles
Article Type: Research-Article
J. Electrochem. En. Conv. Stor. August 2017, 14(3): 031007.
Paper No: JEECS-16-1160
Published Online: June 21, 2017
... of fuel cells. 1 Corresponding author. Manuscript received December 10, 2016; final manuscript received April 20, 2017; published online June 21, 2017. Assoc. Editor: Matthew Mench. 10 12 2016 20 04 2017 PEM fuel cells cathode channel wavy surface mass transfer numerical...
Journal Articles
Article Type: Research-Article
J. Electrochem. En. Conv. Stor. December 2012, 9(6): 061004.
Published Online: October 22, 2012
... on the investigation of effects of geometrical and operating parameters on the concentration polarization, which is useful for the manufacture and operation of the SOFC. lattice Boltzmann method multicomponent porous media mass transfer solid oxide fuel cell It is also clear from Fig. 5...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. February 2012, 9(1): 011012.
Published Online: December 22, 2011
... of a Direct Methanol Fuel Cell,” J. Fuel Cell Sci. Technol., 1 (1), pp. 43–48), was improved by: (1) including methanol transport from the anode flow channel to the backing layer using a mass transfer resistance and (2) accounting for the unreacted methanol transport through the cathode. The model was able...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. February 2012, 9(1): 011005.
Published Online: December 19, 2011
... zero arises from the competing heat and mass transfer dynamics, and is determined by the structural parameters and membrane properties. A sensitivity study is presented and shows that structural and material property optimization can be used with the control system design to mitigate the non-minimum...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. December 2011, 8(6): 061017.
Published Online: September 28, 2011
.... The estimated percentage cost of each of the major components of the fuel cell is shown in the following chart, Fig. 1 [( 1 )]. fuel cell modular design mass flow rate water production heat transfer cooling mass transfer proton exchange membrane fuel cells 06 02 2011 30 06...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. December 2011, 8(6): 061016.
Published Online: September 28, 2011
... for a commercial system. In a stack, heat and mass transfer, which affects the performance, is altered by manifold structures. Therefore, this paper studied three kinds of manifold designs using numerical analyses. Governing equations and electrochemical reaction models were calculated simultaneously to conduct...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. December 2011, 8(6): 061003.
Published Online: September 23, 2011
... to measure the dynamic response of electrodes. Mass transfer behavior was analyzed using equations for diffusion in finite lengths of thin film electrolytes covering the catalyst surface area. Electrode structure parameters were measured using SEM images of the cross section of the membrane electrode...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. October 2011, 8(5): 051022.
Published Online: July 12, 2011
...Joonguen Park; Joongmyeon Bae This paper studies the heat and mass transfer characteristics in a steam reforming reactor using numerical simulation and investigates the operating parameters for effective hydrogen production. Simultaneous analysis of governing equations and chemical reaction...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. February 2011, 8(1): 011013.
Published Online: November 4, 2010
... transport for Nafion ® 21 x membranes will be presented. A mass-transfer coefficient for the interfacial resistance is calculated from experimental data using different permeation cells. This coefficient is shown to depend exponentially on relative humidity or water activity. The interfacial resistance does...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. February 2011, 8(1): 011005.
Published Online: November 1, 2010
...-Scale SOFC for Intermediate Temperature Operation ,” Electrochem. Commun. 1388-2481 , 10 ( 9 ), pp. 1381 – 1383 . 10.1016/j.elecom.2008.07.013 Greene , E. S. , Chiu , W. K. S. , and Medeiros , M. G. , 2006 , “ Mass Transfer in Graded Microstructure Solid Oxide Fuel Cell...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. October 2010, 7(5): 051018.
Published Online: July 20, 2010
...Joonguen Park; Shinku Lee; Sunyoung Kim; Joongmyeon Bae This paper discusses a numerical analysis of the heat and mass transfer characteristics in an autothermal methane reformer. Assuming local thermal equilibrium between the bulk gas and the surface of the catalyst, a one-medium approach...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. October 2010, 7(5): 051004.
Published Online: July 14, 2010
... takes account of momentum, heat, and mass transfer in and around the cell, including the effects of radiation, internal reforming, and electrochemical reactions. The biogas, which is fed into the reformer with steam, is assumed to be composed of methane ( CH 4 ) and carbon dioxide ( CO 2 ) . The results...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. June 2010, 7(3): 031017.
Published Online: March 16, 2010
..., it is necessary to couple the heat and mass transfer to accurately model the species conversion of the reformate stream. The reactions in the SOFC contribute much less to the temperature distribution than in the reformer and therefore the heat transfer in the SOFC is not necessary to model. A packed bed reactor...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. February 2010, 7(1): 011022.
Published Online: November 11, 2009
... of this system. For the analysis, we develop a detailed control-oriented model of the system that captures the heat and mass transfer, chemical kinetics, and electrochemical phenomena. We express the dynamics of the reformer and the fuel cell in state-space form. By applying coordinate transformations...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041010.
Published Online: August 14, 2009
... GDL material were more significant and likely due to mass transport limitations. 16 06 2007 29 11 2007 14 08 2009 current density diffusion mass transfer proton exchange membrane fuel cells The ribbon fuel cell relies on the gas diffusion layer (GDL) to conduct...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041011.
Published Online: August 14, 2009
... voltage undershoot following a decrease in load demand. On the other hand, due to their faster dynamics the mass transfer and electrochemistry processes are assumed instantaneous. The hybridizing device, whose main purpose is to assist the SOFC system (i.e., stack and ancillaries) during transient...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041005.
Published Online: August 11, 2009
... transfer and electrical contact resistance. Existing research for analyzing the assembly pressure effects is mostly experimental. This paper develops a sequential approach to study the pressure effects by combining the mechanical and electrochemical phenomena in fuel cells. The model integrates gas mass...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041003.
Published Online: August 11, 2009
... , “ Heat/Mass Transfer in Porous Electrode of a Fuel Cell ,” Int. J. Heat Mass Transfer , 49 , pp. 2315 – 2327 . 0017-9310 Hwang , J. J. , 2006 , “ Thermal-Electrochemical Modeling of a PEM Fuel Cell ,” J. Electrochem. Soc. 0013-4651 10.1149/1.2137652 , 153 ( 2 ), pp. A216 – A224...