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3 2013

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Numerical investigation of channel geometry on the performance of a PEM fuel cell

Khazaee I., Mohammadiun M.

International Journal of Applied Mechanics and Engineering

2013

Vol. 18, no. 1

85--98

A complete three-dimensional and single phase model for proton exchange membrane (PEM) fuel cells was used to investigate the effect of using different channels geometry on the performances, current density and gas concentration. The proposed model was a full cell model, which includes all the parts of the PEM fuel cell, flow channels, gas diffusion electrodes, catalyst layers and the membrane. Coupled transport and electrochemical kinetics equations were solved in a single domain; therefore no interfacial boundary condition was required at the internal boundaries between cell components. This computational fluid dynamics code was employed as the direct problem solver, which was used to simulate the three-dimensional mass, momentum, energy and species transport phenomena as well as the electron- and proton-transfer process taking place in a PEMFC. The results showed that the predicted polarization curves by using this model were in good agreement with the experimental results and a high performance was observed by using circle geometry for the channels of anode and cathode sides. Also, the results showed that the performance of the fuel cell improved when a rectangular channel was used.

Free vibration analysis of isotropic rectangular plates on Winkler foundation using differential transform method

Kumar Y.

International Journal of Applied Mechanics and Engineering

2013

Vol. 18, no. 2

589--597

A differential transform method (DTM) is used to analyze free transverse vibrations of isotropic rectangular plates resting on a Winkler foundation. Two opposite edges of the plates are assumed to be simply supported. This semi-numerical-analytical technique converts the governing differential equation and boundary conditions into algebraic equations. Characteristic equations are obtained for three combinations of clamped, simply supported and free edge conditions on the other two edges, keeping one of them to be simply supported. Numerical results show the robustness and fast convergence of the method. Correctness of the results is shown by comparing with those obtained using other methods.

Prowdrożeniowe badania efektywności rozdrabniacza ziaren zbóż

Sadkiewicz J.

Ekologia i Technika

2013

R. 21, nr 5

250--255

W pracy przedstawiono wyniki i modernizację powdrożeniową rozdrabniacza siedmio- tarczowego wielootworowego o otworach cylindrycznych w układzie działania pionowym wszystkich tarcz obrotowych z zespołem wsadu bocznym - jako stan inwentaryzowany. Przedstawiono wyniki badań powdrożeniowych. innowacyjnego rozdrabniacza pięciotarczowego w układzie poziomym z tarczami trapezowymi i prostokątnymi o obrotach tylko dwóch tarcz: 2 i 4, z oryginalnymi wybraniamy separacyjnymi - kanałowymi dwustronnymi.

At work shows the results of pro implementation multi holes, cylindrical holes seven disc chipper in the vertical action, with side load-as starting design. Shows the results of studies pro implementations, innovative five disc chipper in landscape mode with trapezials and rectangular ones for speed only two discs No: 2 and 4. with the original bilateral channels.