scholarly journals Experimental Testing and Validation of the Mathematical Model for a Self-Humidifying PEM Fuel Cell

2018 ◽  
Vol 06 (04) ◽  
pp. 202-218
Author(s):  
Ibrahim M. Saleh ◽  
Rashid Ali ◽  
Hongwei Zhang
Keyword(s):  
Mathematical Model ◽  
Fuel Cell ◽  
Experimental Testing ◽  
Pem Fuel Cell ◽  
The Mathematical Model

A Musculoskeletal Model of the Equine Forelimb for Determining Surface Stresses and Strains in the Humerus—Part II. Experimental Testing and Model Validation

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Sarah Pollock ◽  
Susan M. Stover ◽  
M. L. Hull ◽  
Larry D. Galuppo
Keyword(s):  
Mathematical Model ◽  
Stress Fracture ◽  
Biceps Brachii ◽  
Experimental Testing ◽  
Longitudinal Axis ◽  
Principal Strain ◽  
Longitudinal Strains ◽  
The Mathematical Model ◽  
Experimental Strains

The first objective of this study was to experimentally determine surface bone strain magnitudes and directions at the donor site for bone grafts, the site predisposed to stress fracture, the medial and cranial aspects of the transverse cross section corresponding to the stress fracture site, and the middle of the diaphysis of the humerus of a simplified in vitro laboratory preparation. The second objective was to determine whether computing strains solely in the direction of the longitudinal axis of the humerus in the mathematical model was inherently limited by comparing the strains measured along the longitudinal axis of the bone to the principal strain magnitudes and directions. The final objective was to determine whether the mathematical model formulated in Part I [Pollock et al., 2008, ASME J. Biomech. Eng., 130, p. 041006] is valid for determining the bone surface strains at the various locations on the humerus where experimentally measured longitudinal strains are comparable to principal strains. Triple rosette strain gauges were applied at four locations circumferentially on each of two cross sections of interest using a simplified in vitro laboratory preparation. The muscles included the biceps brachii muscle in addition to loaded shoulder muscles that were predicted active by the mathematical model. Strains from the middle grid of each rosette, aligned along the longitudinal axis of the humerus, were compared with calculated principal strain magnitudes and directions. The results indicated that calculating strains solely in the direction of the longitudinal axis is appropriate at six of eight locations. At the cranial and medial aspects of the middle of the diaphysis, the average minimum principal strain was not comparable to the average experimental longitudinal strain. Further analysis at the remaining six locations indicated that the mathematical model formulated in Part I predicts strains within ±2 standard deviations of experimental strains at four of these locations and predicts negligible strains at the remaining two locations, which is consistent with experimental strains. Experimentally determined longitudinal strains at the middle of the diaphysis of the humerus indicate that tensile strains occur at the cranial aspect and compressive strains occur at the caudal aspect while the horse is standing, which is useful for fracture fixation.

Three-dimensional macrohomogeneous mathematical model of an industrial-scale high-temperature PEM fuel cell stack

2018 ◽  
Vol 273 ◽  
pp. 432-446 ◽  
Author(s):  
Monika Drakselová ◽  
Roman Kodým ◽  
Dalimil Šnita ◽  
Frank Beckmann ◽  
Karel Bouzek
Keyword(s):  
Mathematical Model ◽  
High Temperature ◽  
Fuel Cell ◽  
Three Dimensional ◽  
Pem Fuel Cell ◽  
Industrial Scale ◽  
Fuel Cell Stack ◽  
High Temperature Pem

Derivation of a Fast Mathematical Model of PEM Fuel Cell With Two-Phase Water Transport

2011 ◽  
Vol 26 (1) ◽  
pp. 216-226 ◽  
Author(s):  
K. H. Loo ◽  
K. H. Wong ◽  
Y. M. Lai ◽  
S. C. Tan ◽  
Chi K. Tse
Keyword(s):  
Mathematical Model ◽  
Fuel Cell ◽  
Water Transport ◽  
Pem Fuel Cell ◽  
Two Phase ◽  
Phase Water

A Parametric Study of PEM Fuel Cell Performances

2002 ◽  
Author(s):  
Lin Wang ◽  
Attila Husar ◽  
Tianhong Zhou ◽  
Hongtan Liu
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Parametric Study ◽  
Proton Exchange Membrane ◽  
Pem Fuel Cell ◽  
Proton Exchange ◽  
Polarization Curves ◽  
Exchange Membrane

The effects of different parameters on the performances of proton exchange membrane fuel cells were studied experimentally. Experiments with different fuel cell temperatures, humidification temperatures and backpressures of reactant gases have been carried out. Polarization curves from experimental data are presented and the effects of the parameters on the performance of the PEM fuel cell are discussed. The experimental data obtained in this work are used to validate our 3-D mathematical model. It is found that modeling results agree well with our experimental data.

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