Effects of catalytic walls on hydrogen/air combustion inside a micro-tube
作者： Guan-Bang Chen , Chih-Peng Chen , Chih-Yung Wu , Yei-Chin Chao
DOI: 10.1016/J.APCATA.2007.08.011
关键词: Mechanics 、 Temperature gradient 、 Flow velocity 、 Tube (fluid conveyance) 、 Hydrogen 、 Chemistry 、 Combustion 、 Heterogeneous catalysis 、 Catalysis 、 Thermal conductivity
摘要: Numerical simulations with detailed heterogeneous and homogeneous chemistries of hydrogen/air mixture reactions inside a catalytic micro-tube were performed. The characteristics interaction are delineated in terms flow velocity, tube diameter wall thermal conductivity. With the wall, combustion is obviously weakened. will consume part fuel near entrance make region shift downstream. can be divided into two regions. upstream dominated by reaction downstream combustion. increasing inlet expanded finally occupied whole tube. Decreasing enhanced reactions. However, increased heat released at beneficial for maximum allowed velocity first then decreased to almost zero 0.2 mm This means that not sustained such small micro-tube. Finally, three different materials simulated. Higher temperature gradient lower conductivity promote have wider distribution. Since ignited from reaction, effect as obvious it without catalyst walls.
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