A transport model for polymer electrolytes is presented, according to concentrated solution theory and irreversible thermodynamics. Thermodynamic driving forces are developed, transport qualities are identified and experiments devised. Transport quantity of water in Nafion 117 membrane is decided utilizing a concentration cell. It’s 1.4 for any membrane equilibrated with saturated water vapor at 25C, decreases gradually because the membrane is dehydrated, and falls dramatically toward zero because the water content approaches zero. The relation between transference number, transport number, and electroosmotic drag coefficient is presented, as well as their relevance to water-management is discussed. A mathematical type of transport inside a solid-polymer-electrolyte fuel cell is presented. A 2-dimensional membrane-electrode set up is recognized as. Water management, thermal management, and usage of fuel are examined at length. The membrane separators of those fuel cells require sorbed water to keep conductivity it is therefore essential to manage water content in membranes to make sure efficient operation. Water and thermal management are interrelated. Rate of warmth removal is proven to become a critical parameter at the same time of those fuel cells. Current-current curves are presented for operation on air and reformed methanol. Equations for convective diffusion to some rotating disk are solved numerically for any consolutemore point between your bulk concentration and also the surface. One-perturbation expansion is presented for that condition in which the bulk concentration is almost comparable to the consolute-point composition. Answers are when compared with Levich&#96s solution and analysis. less

Authors: Larger, T.F. Publication Date: 1992-07-01 OSTI Identifier: 10180527 Report Number(s): LBL–32577
ON: DE92041204 DOE Contract Number: AC03-76SF00098 Resource Type: Thesis/Dissertation Resource Relation: Additional Information: TH: Thesis (Ph.D.) PBD: Jul 1992 Research Org: Lawrence Berkeley Lab. CA (U . s . States) Sponsoring Org: USDOE, Washington, Electricity (U . s . States) Country of Publication: U . s . States Language: British Subject: 30 DIRECT ENERGY CONVERSION SOLID ELECTROLYTE FUEL CELLS SOLID ELECTROLYTES WATER MASS TRANSFER DIFFUSION POLYMERS MEMBRANES THERMODYNAMICS MATHEMATICAL MODELS COMPUTER CODES HEAT TRANSFER CONVECTION 300500 FUEL CELLS

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