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Research Papers

Manufacturing of High-Temperature Polymer Electrolyte Membranes—Part II: Implementation and System Model Validation

[+] Author and Article Information
Tequila A. L. Harris

 Georgia Institute of Technology, Atlanta, GA 30332

Daniel F. Walczyk

 Rensselaer Polytechnic Institute, Troy, NY 12180

Mathias M. Weber

 BASF Fuel Cell, Frankfurt 65926, Germany

J. Fuel Cell Sci. Technol 7(1), 011008 (Oct 07, 2009) (8 pages) doi:10.1115/1.3119057 History: Received July 14, 2007; Revised August 02, 2008; Published October 07, 2009

In this paper, a complex system of theoretical models, which predicts flow rate as a function of pressure drop, formulated previously by Harris (2007, “Manufacturing of High-Temperature Polymer Electrolyte Membranes—Part I: System Design and Modeling,” ASME J. Fuel Cell Sci. Technol., 7, p. 011007), are validated through a case study. Specifically, the flow behavior of a power law polymer electrolyte membrane solution, as it flows through a novel manufacturing system, is investigated. It is found that a strategic design methodology can be used to develop a complete manufacturing system to fabricate a defect free film. Moreover, the casting method offers significant improvements for the thickness uniformity of the membrane film, compared with film that is fabricated using scaled laboratory processes. The pressure losses predicted throughout the system are validated accordingly, not only from experimental results but also from computational fluid dynamics modeling.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Schematic and (b) pictures of a simplified 30 cm slot die casting system and (c) with the slot die covered by a thermal jacket used for system model validation

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Figure 2

Illustration of several key system variables relative to the (a) slot die exit and (b) the substrate and slot die

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Figure 3

Volumetric flow rate with respect to pressure for a filtered casting system

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Figure 4

Volumetric flow rate experiments for IV 5.3 using six bottles of solution

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Figure 5

Top view of the casting process illustrating the thickness measurement points along the length and width

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Figure 6

Thickness profile for PBI/PA membrane solution of IV 4.75 at 120°C

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Figure 7

Heating oil flow pattern into the (a) front side and (b) back side of the 30 cm slot die

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Figure 8

Predicted casting input pressure for 30 cm slot die using PBI/PA membrane of IV 4.75

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Figure 9

Predicted casting input pressure for 25 cm slot die under various casting conditions using PBI/PA membrane of IV 5.3

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Figure 10

Analytical flow behavior of the PBI/PA membrane solution of IV 4.75 at 120°C

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Figure 11

Pressure drop through the pressure vessel and a pipe

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