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Keywords: mass transfer
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Journal Articles
Publisher: ASME
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
Publisher: ASME
Article Type: Research-Article
J. Electrochem. En. Conv. Stor. November 2018, 15(4): 041008.
Paper No: JEECS-17-1070
Published Online: May 7, 2018
... regions where y w = | ε | , which would be impossible in reality. Such in-plane gradients do not arise for one-dimensional models. Fig. 3 Typical calculated species distribution in an SOFC cathode where g is a mass transfer coefficient, based on local minimum value wall...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Electrochem. En. Conv. Stor. August 2017, 14(3): 031007.
Paper No: JEECS-16-1160
Published Online: June 21, 2017
... . 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 modeling...
Journal Articles
Journal Articles
Publisher: ASME
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
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. December 2011, 8(6): 061017.
Published Online: September 28, 2011
... , Fundamentals of Heat and Mass Transfer , 3rd ed. , Wiley , New York . V volt ( V ) I current ( A ) T temperature ( ° C , K ) M molar mass of a substance ( mole ) c number of cells...
Journal Articles
Journal Articles
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
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
Journal Articles
Journal Articles
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041010.
Published Online: August 14, 2009
... for the constitutive j MEA relationship for each GDL as described in Eq. 3 are displayed in Table 3 . 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041003.
Published Online: August 11, 2009
... cells is the feeding of the electrode with reactants and the removal of products. proton exchange membrane fuel cell air-breathing cathode porous transports chemically reactive flow current density electrochemical electrodes finite element analysis mass transfer orifices...
Journal Articles
Publisher: ASME
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...