Effect of cathode pulsating flow on mass transport and performance of solid oxide fuel cell

Yahya, Abir; Hammouda, Seifeddine Ben; Slimene, Sahar; Dhahri, Hacen

doi:10.1016/j.ijthermalsci.2021.107437

Cited by 12 publications

(5 citation statements)

References 42 publications

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“…After adopting the BGK approximation, the discrete Boltzmann's equation with external forces can be formulated as below [48,49] For the dynamic field…”

Section: Bhatnagar-gross-krook Modelmentioning

confidence: 99%

Numerical Investigation of the Impact of the Partial Anode Channel Blockage on the Enhanced Mass Transfer and Performance of a Solid Oxide Fuel Cell

Yahya,

Naji,

Dhahri

2023

Energy Tech

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This study aims to numerically reveal and assess the influence of inserts of different shapes partially obstructing the anode flow channel on flow characteristics, heat and mass transfer, and planar solid oxide fuel cell (SOFC) performance. To this end, a lattice‐based Boltzmann method is taken. Within this setting, trapezoidal, circular, and triangular shapes and inserts’ heights have been deemed. It turns out that trapezoidal and circular obstacles increase the fuel mass transport to the anode/electrolyte interface and effectively improve the SOFC's power density. As for triangular obstacles, their impact is negligible in terms of performance. Through the findings, it can be stated that it is the trapezoidal design that is better than the other designs. Further, the effect of the inserts’ height has also been assessed to set the optimal performance. It is found that the SOFC performance increases by 4% when using five trapezoidal obstacles with a 90% blocking rate compared to the unobstructed channel. However, in the case of the circular design with five blocks and a 90% blocking rate, the power density improves only about 2.3%. To sum up, improving SOFCs’ power density by designing the anode channel can be adopted to achieve optimal operations.

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“…After adopting the BGK approximation, the discrete Boltzmann's equation with external forces can be formulated as below [48,49] For the dynamic field…”

Section: Bhatnagar-gross-krook Modelmentioning

confidence: 99%

Numerical Investigation of the Impact of the Partial Anode Channel Blockage on the Enhanced Mass Transfer and Performance of a Solid Oxide Fuel Cell

Yahya,

Naji,

Dhahri

2023

Energy Tech

Self Cite

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“…[41] Yet another example is by Yahya et al, who studied the effect of a cathode pulsating flow on the mass transport and performance of a solid oxide fuel cell. [42] Their results showed that the power output increased by an enhanced oxygen diffusion, improving the convective species transport to the reaction sites.…”

Section: Introductionmentioning

confidence: 99%

“…Gomaa and Taweel also concluded that combining turbulence promoters with a pulsed flow regime can lead to a 77‐fold increase in the mass transfer rate at the solid‐fluid interface [41] . Yet another example is by Yahya et al., who studied the effect of a cathode pulsating flow on the mass transport and performance of a solid oxide fuel cell [42] . Their results showed that the power output increased by an enhanced oxygen diffusion, improving the convective species transport to the reaction sites.…”

Section: Introductionmentioning

confidence: 99%

Improved Vanadium Flow Battery Performance through a Pulsating Electrolyte Flow Regime

De Wolf,

Rossen,

De Rop

et al. 2023

Batteries & Supercaps

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The interest in flow batteries as energy storage devices is growing due to the rising share of intermittent renewable energy sources. In this work, the performance of a vanadium flow battery is improved, without altering the electrochemical cell, by applying a pulsating flow. This novel flow battery flow regime aims to enhance performance by improving its mass transfer properties. Both the pulse volume and frequency have an influence on the battery performance, and lead to a 38.7 % increase in accessible discharge capacity compared to the conventional steady flow regime at values of 0.40 cm3 and 2.4 Hz in this cell, respectively. Furthermore, at these parameter settings a reduction of the mass transfer resistance by 71.4 % is achieved at 0.2 cm3/min ⋅ cm2. These results show that a pulsating flow can be beneficial in certain conditions, opening new possibilities for boosting performance in flow batteries.

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“…Pulsating flow is one of the unsteady flows that can change the characteristics of hydrodynamics and enhance mass transport [ 19 , 20 ]. This paper proposes a method for using a tube tool with wedged end face to generate pulsating flow field in the IEG to enhance the removal of electrolytic by-products, as well as improve the machining accuracy and surface quality in EC-milling.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Milling of Deep-Narrow Grooves on GH4169 Alloy Using Tube Electrode with Wedged End Face

Qiu

Chen

2022

Micromachines

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Deep-narrow grooves (DNGs) of nickel-based alloy GH4169 are extensively used in aerospace industry. Electrochemical milling (EC-milling) can manufacture special structures including DNGs by controlling the moving path of simple tool, showing a flexible process with the advantages of high machining efficiency, regardless of material hardness, no residual stresses, burrs, and tool wear. However, due to the inefficient removal of electrolytic by-products in the inter-electrode gap (IEG), the machining accuracy and surface quality are always unsatisfactory. In this paper, a novel tube tool with wedged end face is designed to generate pulsating flow field in IEG, which can enhance the removal of electrolytic by-products as well as improve the machining quality of DNG. The flow field simulation results show that the electrolyte velocity in the IEG is changed periodically along with the rotation of the tube tool. The pulsating amplitude of electrolyte is changed by adjusting the wedged angle in the end face of the tube tool, which could affect the EC-milling process. Experimental results suggest that the machining quality of DNG, including the average width, taper of sidewall, and surface roughness, is significantly improved by using the tube tool with wedged end face. Compared with other wedged angles, the end face with the wedged angle of 40° is more suitable for the EC-milling process. DNG with the width of 1.49 mm ± 0.04 mm, taper of 1.53° ± 0.46°, and surface roughness (Ra) of 1.04 μm is well manufactured with the milling rate of 0.42 mm/min. Moreover, increasing the spindle speed and feed rate can further improve the machining quality of DNG. Finally, a complex DNG structure with the depth of 5 mm is well manufactured with the spindle speed of 4000 rpm and feed rate of 0.48 mm/min.

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Effect of cathode pulsating flow on mass transport and performance of solid oxide fuel cell

Cited by 12 publications

References 42 publications

Numerical Investigation of the Impact of the Partial Anode Channel Blockage on the Enhanced Mass Transfer and Performance of a Solid Oxide Fuel Cell

Numerical Investigation of the Impact of the Partial Anode Channel Blockage on the Enhanced Mass Transfer and Performance of a Solid Oxide Fuel Cell

Improved Vanadium Flow Battery Performance through a Pulsating Electrolyte Flow Regime

Electrochemical Milling of Deep-Narrow Grooves on GH4169 Alloy Using Tube Electrode with Wedged End Face

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