Download Transport Phenomena In Fuel Cells (Developments in Heat by B. Sunden, M. Faghri PDF

By B. Sunden, M. Faghri

Gasoline cells are anticipated to play an important function within the subsequent iteration of strength platforms and street automobiles for transportation. in spite of the fact that, huge growth is needed in decreasing production expenses and bettering functionality. This booklet goals to give a contribution to the certainty of the shipping approaches in reliable oxide gas cells (SOFC), proton trade membrane gas cells (PEMFC) and direct methanol gasoline cells (DMFC), that are of present curiosity. a variety of issues is roofed, that includes contributions from well-liked scientists and engineers within the box. a close precis of cutting-edge wisdom and destiny wishes, this article will be of price to graduate scholars and researchers engaged on the improvement of gas cells inside academia and undefined.

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Extra resources for Transport Phenomena In Fuel Cells (Developments in Heat Transfer)

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It is expected that the experimental data for these SOFCs in different dimensions and operating conditions will facilitate a wide benchmark range for validation of the numerical modeling work. 1 The SOFC terminal voltage The computer calculated and the experimentally obtained cell terminal voltages under different cell current densities are shown in Fig. 9. The relative deviation of 28 Transport Phenomena in Fuel Cells Table 5: Example SOFCs with test data available. Data sequence: Outer diameter (mm)/Thickness (mm)/Length (mm) Singhal [27] Hagiwara et al.

However, the height and the width of the gas channel are both small (less than 3 mm), and the electric resistance through the channel wall might be negligible [30]. This simplification leads to the consideration that the current is almost exclusively perpendicularly collected, which means that the current flows normally to the trilayer of the cathode, electrolyte and anode. When calculating the local current density, the ohmic loss is thus simply accounted for in the following way [30]: I= A· (E − ηaAct − ηcAct ) − Vcell , (δa ρea + δe ρee + δc ρec ) (40) where A is a unit area on the anode/electrolyte/cathode tri-layer, through which the current I passes; δ is the thickness of the individual layers; ρe is the resistivity of the electrodes and electrolyte; Vcell is the cell terminal voltage; and the denominator of the right-hand side term is the summation of the resistance of the tri-layer.

9 that, under the same cell current density, the cell voltage of the SOFC tested by Hagiwara et al. [26] is the highest and that by Hirano et al. [25] is the lowest. The mole fraction of hydrogen in the fuel for the SOFC tested by Hirano et al. [25] is low, which might be the major reason that this cell has the lowest cell voltage. Because the current must be collected circumferentially in a tubular type fuel cell, the large diameter of the cell tube investigated by Singhal [27] and Tomlins et al.

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