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| 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 |
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Abstract 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.
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Published: 08 September 2011
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微凸台阵列型重整微反应器的传热传质特性
针对带微凸台阵列结构的重整制氢微反应器的流体传热传质问题,建立微通道传热传质理论模型.采用计算流体力学软件Fluent对不同微凸台阵列结构和排布方式微通道的流体传热传质进行数值模拟,并研究在低雷诺数条件下不同微通道结构对微通道摩擦系数和努塞尔数的影响.结果表明,随着气体入口速度增大,通道摩擦系数减小,努塞尔数增加；当气体入口速度相对较小时,反应器微凸台阵列高度及横向中心间距的差异对努塞尔数影响不大；当气体入口速度相对较大时,随着微凸台阵列纵向和横向中心间距的增加,摩擦系数减小,随着微凸台高度的增加（除1.3 mm以外）,摩擦系数和努塞尔数均先增后降.研究成果为带微凸台阵列结构重整制氢微通道反应器的设计和制造提供理论依据.
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| ［1］ WANG Xiuli, TU Jiangping, ZHANG Peilong, et al. Hydrogen storage properties of ballmilled Mgbased composite with PdCl2 additive ［J］. Jouranl of Zhejiang University Science A, 2007, 8(9): 1510-1513.
［2］ VOECKS G E, CRESCENTA L, CALIF. Steam reformer with catalytic combustor: US, 4909808 ［P］: 1990-03-20.
［3］ DE WILD P J, VERHAAK M J F M. Catalytic production of hydrogen from methanol ［J］. Catalysis Today, 2000, 60(1/2): 3-10.
［4］ CUNHA J, AZEVEDO J L T. Modelling the integration of a compact plate steam reformer in a fuel cell system ［J］. Jouranl of Power Sources, 2000, 86(1/2): 515-522.
［5］ HOLLADAY J D, JONES E O, PHELPS M, et al. Microfuel processor for use in a miniature power supply ［J］. Journal of Power Sources, 2002, 108(1/2): 21-27.
［6］ 钱淼,梅德庆,姚喆赫,等.一种带微凸台阵列结构的自热型醇类重整制氢微通道反应器:中国, ZL 2009 2 0123364.0 ［P］. 2010-3-24.
［7］ 陈熙.动力论及其在传热与流动研究中的应用 ［M］.北京:清华大学出版社,1996: 4-12.
［8］ 张也影.流体力学 ［M］.北京：高等教育出版社,1999: 126-194.
［9］ PALO D R, HOLLADAY J D, ROZMIAREK R T, et al. Development of a soldierportable fuel cell system Part I: A breadboard methanol fuel processor ［J］. Journal of Power Sources, 2002, 108(1/2): 28-34.
［10］ 杨世铭.传热学 ［M］.北京：高等教育出版社,1998: 26-65.
［11］ SHORT JR. B E, RAAD P E, PRICE D C. Performance of pin fin cast aluminum coldwalls, part 1: friction factor correlations ［J］. Journal of Thermophysics Heat Transfer, 2002, 16(3): 389-396. |
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