کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1272246 1497488 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Accelerating hydrogen absorption in a metal hydride storage tank by physical mixing
ترجمه فارسی عنوان
سرعت جذب هیدروژن در یک مخزن ذخیره سازی فلز هیدرید را با اختلاط فیزیکی افزایش می دهد
کلمات کلیدی
ذخیره سازی هیدروژن، فلز هیدرید، مخلوط کردن فیزیکی، میزان مخلوط کردن، فوم آلومینیوم، ضریب انتقال حرارت
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• A novel method to accelerate hydrogen charging in metal hydride by physical mixing.
• Experiments demonstrated that mixing can accelerate the hydrogen absorption.
• Simulations were conducted to explore the effect of mixing on hydrogen charging.
• Effect of mixing rate, convection coefficient, and Al foam% was simulated.
• Benefit of mixing is higher for lower convection coefficients, and lower Al foam%.

A novel method to improve the hydrogen absorption rate in a metal hydride tank is proposed by introducing physical mixing of the metal hydride powder to promote heat removal and accelerate the kinetics of the hydriding process. Experiments were conducted with and without mixing to demonstrate that the hydrogen absorption rate can be improved significantly by mixing. Mixing was achieved by tilting the cylindrical metal hydride tank back and forth by 90° during charging. A mathematical model was also developed to simulate the effects of physical mixing. The model results indicate that physical mixing enhances heat transfer by redistributing the hydride powder from the hot core to the boundary and facilitates heat removal by convection at the tank walls. After validating the model against experimental results, the effect of physical mixing on accelerating hydrogen storage was explored by changing the mixing rate and the convection coefficient at the tank wall, and by increasing the thermal conductivity of the hydride bed by adding aluminum foam. It was found that while higher mixing rates generally improve the absorption rate, the benefits of mixing are reduced for higher convection coefficients, and for higher weight fractions of Al foam. Simulations were also conducted with and without mixing as a function of tank size. The results show that the benefit of physical mixing increases with tank size.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 21, 15 July 2014, Pages 11035–11046
نویسندگان
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