Numerical study on micro-reformer performance and local transport phenomena of the plate methanol steam micro-reformer |
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Authors: | Ching-Yi Hsueh Hsin-Sen Chu Wei-Mon Yan |
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Affiliation: | 1. Department of Mechanical Engineering, National Chiao Tung University, Hsin-Chu 300, Taiwan, ROC;2. Department of Mechatronic Engineering, Huafan University, Shih-Ting, Taipei 223, Taiwan, ROC |
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Abstract: | The objective of this work is to investigate the transport phenomena and performance of a plate steam methanol micro-reformer. Micro channels of various height and width ratios are numerically analyzed to understand their effects on the reactant gas transport characteristics and micro-reformer performance. In addition, influences of Reynolds number and geometric size of micro channel on methanol conversion of micro-reformer and gas transport phenomena are also explored. The predicted results demonstrated that better performance is noted for a micro channel reformer with lower aspect-ratio micro channel. This is due to the larger the chemical reaction surface area for a lower aspect-ratio channel reformer. It is also found that the methanol conversion decreases with increasing Reynolds number Re. The results also indicate that the smaller micro channel size experiences a better methanol conversion. This is due to the fact that a smaller micro channel has a much more uniform temperature distribution, which in turn, fuel utilization efficiency is improved for a smaller micro channel reformer. |
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Keywords: | Micro-reformer Micro channel Aspect ratio Chemical reaction Heat and mass transfer |
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