Heat and mass transfer characteristics in reforming micro-reactor with micro-pin-fin arrays
QIAN Miao1, MEI De-qing1, LIU Bin-hong2,CHEN Zi-chen1
1. Department of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China 2. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Aiming at fluid heat and mass transfer in micro-reactor with micro-pin-fin arrays for hydrogen production by reforming, a theoretical model about the heat and mass transfer in micro-channel was established. A CFD software Fluent was used to calculate the heat and mass transfer of different structure and arrangement mode of micro-pin-fin arrays in microchannel, and the effect of different micro-channel structure on the friction coefficient and Nusselt number of microchannel was analyzed under lower Reynolds number condition. The results indicate that, with the increase of the inlet velocity, the friction coefficient decreases while the Nusselt number increases. When the inlet velocity is lower, the height and transverse center-to-center distance of micro-pin-fin arrays have little effect on Nusselt number. When the inlet velocity is higher, with the increase of longitudinal and transverse center-to-center distance of micro-pin-fin arrays, the friction coefficient decreases, with the increase of the height of micro-pin-fins(except 1.3 mm), both friction coefficient and Nusselt number increase firstly and then decrease. The analysis results provide the theoretical basis for the design and fabrication of micro-channel reactor with micro-pin-fin arrays for hydrogen production by reforming.
QIAN Miao, MEI De-qing, LIU Bin-hong,CHEN Zi-chen. Heat and mass transfer characteristics in reforming micro-reactor with micro-pin-fin arrays. J4, 2011, 45(8): 1387-1392.
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