On Modeling of Heat and Mass Transfer and Other Transport Phenomena in Fuel Cells

Sundén, Bengt; Yuan, Jinliang

doi:10.5098/hmt.v1.1.3008

Cited by 3 publications

(3 citation statements)

References 62 publications

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“…As mentioned earlier, different Nu numbers are defined for H -3 T boundary condition. 8,15 Two different Nu numbers are used, Nu q for porous wall (surface of constant heat flux) and Nu T for nonporous walls (constant temprature surfaces).…”

Section: Resultsmentioning

confidence: 99%

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Pseudo 3D modeling of suction and injection effects on fully developed laminar flow and heat transfer in rectangular fuel cell channels

Abukheyli

Mirbozorgi

2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this paper, the flow in the rectangular fuel cell channel with different aspect ratios has been numerically simulated. The bottom wall of the rectangular channel is porous and subjected to a uniform mass injection or suction, while the other three walls are nonporous or impermeable. Assuming the hydro-dynamically and thermally fully developed flow, the mass, momentum, and energy equations have been solved with a two-dimensional code. The present numerical results are in good agreement with the numerical results in the literature. The wall friction coefficients and Nusselt numbers were obtained for different aspect ratios, different wall Reynolds numbers (for suction and injection), and different thermal boundary conditions. The results show that for each aspect ratio, friction coefficient (fRe) is larger for injection than for suction. Also at unit expect ratio, a/b ¼ 1, the fRe have minimum value for each wall Reynolds number (Re m) and with increasing and decreasing aspect ratio, fRe increases. The changes of Nusselt (Nu) number with Re m and aspect ratio is dependent on the thermal boundary conditions and definition of Nu number (for combined boundary condition).

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Section: Resultsmentioning

confidence: 99%

“…boundary condition. 8,15 Two different Nu numbers are used, Nu q for porous wall (surface of constant heat flux) and Nu T for nonporous walls (constant temprature surfaces). Figure 11 shows the distribution of Nu q versus wall Reynolds numbers for different aspect ratios.…”

Section: Friction Coefficient and Velocity Distributionmentioning

confidence: 99%

Pseudo 3D modeling of suction and injection effects on fully developed laminar flow and heat transfer in rectangular fuel cell channels

Abukheyli

Mirbozorgi

2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…where q includes the heat generated by the current flow through the electrodes (Ohmic losses) and the activation losses, and the heat due to chemical reactions. Once again additional terms such as heat terms due to convection and radiation appear as boundary conditions [30,31,32].…”

Section: The Electrodesmentioning

confidence: 99%

Solid Oxide Fuel Cell - A Future Source of Power and Heat Generation

Kalra¹,

Rishabh²,

Kumar³

2013

MSF

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Fuel cells are devices for electrochemically converting the chemical energy of a fuel gas into electrical energy and heat without the need for direct combustion as an intermediate step. The main advantages of fuel cells are that they rely on the high conversion efficiency and low environmental impact than traditional energy conversion systems. One promising fuel cell type, Solid oxide Fuel Cell, has all the components in the solid phase utilises nano-ceramic composite materials and operates at elevated temperatures in the range 500-1000°C. It has suitable perspectives to replace their classical counterparts for the distributed generation of electrical energy with small and medium power sources. The inherent advantages of such high temperature fuel cells are internal reforming of methane and waste heat production at high temperatures which lower the demands on the fuel processing system and lead to higher efficiency compared with low temperature fuel cells. Using natural gas as feed, an electric efficiency of more than 88% has been predicted. On the other hand, considerable research is going on to reduce the operating temperatures between 600°C to 800°C to increase life-time and thereby reduce costs. These can be achieved only by using electrolytes with proper ionic conductivity at the intermediate temperatures. In addition, this technology does not produce significant amounts of pollutants such as nitrogen oxides compared with internal combustion engines. Solid oxide fuel cells are seen as ideal energy sources in transport, stationary, and distributed power generators.

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Fuel crossover and internal current in proton exchange membrane fuel cell modeling

Chakraborty

2016

Applied Energy

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On Modeling of Heat and Mass Transfer and Other Transport Phenomena in Fuel Cells

Cited by 3 publications

References 62 publications

Pseudo 3D modeling of suction and injection effects on fully developed laminar flow and heat transfer in rectangular fuel cell channels

Pseudo 3D modeling of suction and injection effects on fully developed laminar flow and heat transfer in rectangular fuel cell channels

Solid Oxide Fuel Cell - A Future Source of Power and Heat Generation

Fuel crossover and internal current in proton exchange membrane fuel cell modeling

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