Numerical study of a novel micro-diaphragm flow channel with piezoelectric device for proton exchange membrane fuel cells

Previous studies have shown that the amplitude of the vibration of a piezoelectric (PZT) device produces an oscillating flow that changes the chamber volume along with a curvature variation of the diaphragm. In this study, an actuating micro-diaphragm with piezoelectric effects is utilized as an air-flow channel in proton exchange membrane fuel cell (PEMFC) systems, called PZT-PEMFC. This newly designed gas pump, with a piezoelectric actuation structure, can feed air into the system of an air-breathing PEMFC. When the actuator moves outward to increase the cathode channel volume, the air is sucked into the chamber; moving inward decreases the channel's volume and thereby compresses air into the catalyst layer and enhancing the chemical reaction. The air-standard PZT-PEMFC cycle is proposed to describe an air-breathing PZT-PEMFC. A novel design for PZT-PEMFCs has been proposed and a three-dimensional, transitional model has been successfully built to account for its major phenomena and performance. Moreover, at high frequencies, PZT actuation leads to a more stable current output, more drained water, higher sucked air, higher hydrogen consumption, and also overcomes concentration losses.

[1]  Sadik Kakac,et al.  Two‐dimensional model for proton exchange membrane fuel cells , 1998 .

[2]  C. M. Rangel,et al.  High performance PEMFC stack with open-cathode at ambient pressure and temperature conditions , 2007 .

[3]  Shanhai Ge,et al.  A mathematical model for PEMFC in different flow modes , 2003 .

[4]  Dieter Brüggemann,et al.  Concentration and ohmic losses in free-breathing PEMFC , 2007 .

[5]  In-Hwan Oh,et al.  Effects of cathode open area and relative humidity on the performance of air-breathing polymer electrolyte membrane fuel cells , 2006 .

[6]  In-Hwan Oh,et al.  A study on cathode structure and water transport in air-breathing PEM fuel cells , 2006 .

[7]  G. Stemme,et al.  A valveless diffuser/nozzle-based fluid pump , 1993 .

[8]  Ranga Pitchumani,et al.  Numerical studies on an air-breathing proton exchange membrane (PEM) fuel cell stack , 2007 .

[9]  Hiroaki Suzuki,et al.  Integrated microfluidic system with electrochemically actuated on-chip pumps and valves , 2003 .

[10]  Anders Olsson,et al.  Numerical and experimental studies of flat-walled diffuser elements for valve-less micropumps , 2000 .

[11]  Neil M. White,et al.  A novel micromachined pump based on thick-film piezoelectric actuation , 1997, Proceedings of International Solid State Sensors and Actuators Conference (Transducers '97).

[12]  A. Glass,et al.  Applications Of Ferroelectrics , 2001 .

[13]  Thomas F. Fuller,et al.  Experimental Determination of the Transport Number of Water in Nafion 117 Membrane , 1992 .

[14]  Anders Olsson,et al.  Diffuser-element design investigation for valve-less pumps , 1996 .

[15]  Xianguo Li,et al.  Review of bipolar plates in PEM fuel cells: Flow-field designs , 2005 .

[16]  J. Maier,et al.  Electroosmotic drag in polymer electrolyte membranes: an electrophoretic NMR study , 1999 .

[17]  Shimshon Gottesfeld,et al.  The Water Content Dependence of Electro-Osmotic Drag in Proton-Conducting Polymer Electrolytes , 1995 .

[18]  P. Bergveld,et al.  A plastic micropump constructed with conventional techniques and materials , 1999 .

[19]  Bo Li,et al.  Development of large flow rate, robust, passive micro check valves for compact piezoelectrically actuated pumps , 2005 .

[20]  Minggao Ouyang,et al.  Three-dimensional heat and mass transfer analysis in an air-breathing proton exchange membrane fuel cell , 2007 .

[21]  H. Kahn,et al.  Thin-film shape-memory alloy actuated micropumps , 1998 .

[22]  T. Nguyen,et al.  An Along‐the‐Channel Model for Proton Exchange Membrane Fuel Cells , 1998 .

[23]  Olivier Français,et al.  Analytical static modelling and optimization of electrostatic micropumps , 1997 .

[24]  Zhaoying Zhou,et al.  Study on a PZT-actuated diaphragm pump for air supply for micro fuel cells , 2006 .

[25]  Shanhai Ge,et al.  Experimental determination of electro-osmotic drag coefficient in Nafion membrane for fuel cells , 2006 .