شبیه‌سازی همزمان لایه انتشار گاز و کانال هوا در پیل سوختی مبادله پروتون: بررسی در مقیاس حفره فلودینگ آب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی شاهرود

2 Shahrood University of Tech, Shahrood, Iran

چکیده

در این مطالعه، از روش شبکه بولتزمن برای بررسی انتقال آب مایع در لایه انتشار گاز و کانال گاز قسمت کاتد پیل سوختی غشای مبادله پروتون استفاده شده است. در این مطالعه اثرات قابلیت خیسی لایه انتشار گاز بر روی فرایند حذف و توزیع آب مایع مورد بررسی قرار گرفته است. علاوه بر این به مطالعه رفتار دینامیکی و اشباع آب مایع در لایه انتشار گاز در دو حالت پایا و غیر پایا پرداخته شده است .همچنین تعداد خوشه های مؤثر، عمل اتصال بین خوشه ها و زمان رسیدن به حالت پایا بررسی شده است. نتایج نشان می دهد که خیسی سطح بر روی اشباع آب مایع در لایه انتشار گاز اثر می گذارد که در ناحیه 160>y>   صد این اثر بیشترین مقدار است. همچنین زمان رسیدن به حالت پایا برای زاویه تماس °115 به میزان 6 درصد از حالت °145 بیشتر می باشد. بنابراین هر چه زاویه تماس سطوح لایه انتشار گاز بیشتر شود، زمان رسیدن به توزیع اشباع آب در حالت پایا و همچنین زمان رسیدن آب به کانال گاز کاهش خواهد یافت، به همین دلیل سطوح جامد آب گریزتر، باعث بهبود مدیریت آب مایع در لایه انتشار گاز پیل سوختی غشای مبادله پروتون خواهد بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Simultaneous Simulation of Gas Diffusion Layer and Air Channel in a Polymer Electrolyte Membrane Fuel Cell: Pore-Scale Modeling of Water Flooding

نویسنده [English]

  • Mohsen Nazari 2
چکیده [English]

In this study, Lattice Boltzmann method is used to investigate liquid water transport in a carbon paper gas diffusion layer and gas channel of polymer electrolyte membrane fuel cells. The effects of gas diffusion layer wettability on the removal process and liquid water distribution are investigated. In addition, liquid water dynamic behaviors and liquid water saturation within the gas diffusion layer in two case of steady and transient are explored. This study focuses on the effects of surface wettability on the number of effective clusters, merging of clusters, and the required time for reaching the steady-state water distribution. The results show that the wettability of surface affects on the saturation of liquid water in the gas diffusion layer and in  100lu<Y<160lu, this effect is noticeable. The steady-  water distribution is observed at time step of 1590000 and 1500000 (lattice unit) for the contact angles of 115° and 145°, respectively. Thus the simulation results show that by increasing the contact angle of fibers in gas diffusion layer, the required time to obtain a steady state water distribution is reduced. Therefore, if the solid surface becomes more hydrophobic, water management will be improved in the gas diffusion layer.

کلیدواژه‌ها [English]

  • LIQUID WATER
  • Gas diffusion layer
  • WETTABILITY
  • LIQUID WATER SATURATION
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