CSME Conference Proceedings (May 27-30, 2018)
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Browsing CSME Conference Proceedings (May 27-30, 2018) by Author "20880f0324c2401624d97b8570a09f05"
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Item Open Access Gas-Liquid Phenomena With Dynamic Contact Angles In The Cathode Of A Parallel Proton Exchange Membrane Fuel Cell(CSME-SCGM, May-18) Wang, Xichen; Zhou, Biao; Jiang, MengchengAmong the numerical studies on liquid water transport in Proton Exchange Membrane Fuel Cells (PEMFCs), the static contact angle (SCA) model is generally used, while the dynamic contact angle (DCA) model is only applied on the simulation of droplet behaviors with simple geometries like a single microchannel. In this study, the DCA model is employed to study the gas-liquid phenomena inside the cathode of PEMFC with parallel flow field design, i.e., Parallel-DCA model. The water emerging and transport processes are simulated based on this Parallel-DCA model using the volume of fluid (VOF) method. The numerical results are also compared to those from the Parallel-SCA model with the same computational domain and operating conditions.Item Open Access Numerical Simulation Of Gas-Liquid Phenomena In The Cathode Of A Stirred Tank Reactor Proton Exchange Membrane Fuel Cell(CSME-SCGM, May-18) Wang, Xichen; Zhou, Biao; Jiang, MengchengLiquid water management is still a critical issue in the improvement of proton exchange membrane fuel cell (PEMFC) performance. In this work, for the first time, the liquid water behavior and transport inside the cathode of a PEMFC with a stirred tank reactor (STR) design, rather than the conventional PEMFC flow channel design, are numerically studied. The volume of fluid (VOF) method is employed in the simulation to track the gas-liquid interface. The capability of STR-PEMFC to reduce the liquid water flooding is also investigated and verified from the simulation, showing the potential of this channel-less type fuel cell in the further development.Item Open Access Numerical Study Of Inlet Gas Velocity Effects On Droplet Behaviors In Microchannel(CSME-SCGM, May-18) Jiang, Mengcheng; Zhou, BiaoIn this study, the numerical simulation of liquid water behaviors inside a single straight microchannel is conducted using Volume of fluid (VOF) method and dynamic contact angle (DCA) model. Two different gas inlet velocities are considered in the simulation to investigate the gas velocity effects on the droplet behaviors. The general process of the liquid water evolvement inside the channel are presented and discussed. The results indicate that the water droplet will form into long slug flow under lower gas inlet velocity and thin film flow under higher gas inlet velocity.