کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4766636 | 1424101 | 2017 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigating PhaseâChangeâInduced Flow in Gas Diffusion Layers in Fuel Cells with Xâray Computed Tomography
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The performance of polymerâelectrolyte fuel cells is heavily dependent on proper management of liquid water. One particular reason is that liquid water can collect in the gas diffusion layers (GDLs) blocking the reactant flow to the catalyst layer. This results in increased massâtransport losses. At higher temperatures, evaporation of water becomes a dominant waterâremoval mechanism and specifically phaseâchangeâinduced (PCI) flow is present due to thermal gradients. This study used synchrotron based micro Xâray computed tomography (CT) to visualize and quantify the water distribution within gas diffusion layers subject to a thermal gradient. Plotting saturation as a function of throughâplane distance quantitatively shows water redistribution, where water evaporates at hotter locations and condenses in colder locations. The morphology of the GDLs on the microâscale, as well as evaporating water clusters, are resolved, indicating that the GDL voids are slightly prolate, whereas water clusters are oblate. From the mean radii of water distributions and visual inspection, it is observed that larger water clusters evaporate faster than smaller ones.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 256, 1 December 2017, Pages 279-290
Journal: Electrochimica Acta - Volume 256, 1 December 2017, Pages 279-290
نویسندگان
Andrew D. Shum, Dilworth Y. Parkinson, Xianghui Xiao, Adam Z. Weber, Odne S. Burheim, Iryna V. Zenyuk,