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Journal of Applied Fluid Mechanics، جلد ۸، شماره ۴، صفحات ۷۰۳-۷۱۲
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عنوان انگلیسی Ammonia Decomposition for Hydrogen Production in Catalytic Microchannels with Slip/Jump Effects
چکیده انگلیسی مقاله The rarefaction effects on the catalytic decomposition of NH3 in ruthenium–coated planar microchannels is numerically simulated in the Knudsen number range 0.015-0.03. A colocated finite–volume method is used to solve the governing equations. A concentration jump model derived from the kinetic theory of gases is employed to account for the concentration discontinuity at the reactive walls. A detailed surface reaction mechanism for ammonia decomposition on ruthenium along with a multi-component species diffusion model are used to study the effects of concentration jump coupled with velocity slip and temperature jump on the walls. The velocity-slip, temperature-jump and concentration-jump boundary conditions have miscellaneous effects on flow, temperature and species concentration fields. The results suggest that the velocity-slip boundary condition only slightly influences the species distribution at the edge of the Knudsen layer as well as inside the channel, while the temperature-jump boundary condition affects the heat and mass transfer characteristics the most. The concentration-jump effect, on the other hand, can counter balance the temperature-jump effects in some cases.
کلیدواژه‌های انگلیسی مقاله Ammonia decomposition, Heterogeneous reactions, Concentration jump, Velocity slip, Temperature jump, Microchannel
نویسندگان مقاله A. Qazi Zade |
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada

M. Renksizbulut |
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada

J. Friedman |
Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON, M5B 2K3, Canada

نشانی اینترنتی https://www.jafmonline.net/article_1557_2712a8f9a2a571a6851d6339a70aef29.pdf
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