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Study of Forced Convection Heat Transfer of Supercritical CO2 in a Horizontal Channel by Lattice Boltzmann Method

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Study of Forced Convection Heat Transfer of Supercritical CO2 in a Horizontal Channel by Lattice Boltzmann Method ( study-forced-convection-heat-transfer-supercritical-co2-a-ho )

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Advances in Applied Mathematics and Mechanics DOI: 10.4208/aamm.10-10S03 Adv. Appl. Math. Mech., Vol. 2, No. 5, pp. 564-572 October 2010 Study of Forced Convection Heat Transfer of Supercritical CO2 in a Horizontal Channel by Lattice Boltzmann Method Xiaodong Niu1,∗, Hiroshi Yamaguchi1, Yuhiro Iwamoto1, Xinrong Zhang1,2, Mingjun Li3 and Yuhiro Iwamoto1 1 Department of Mechanical Engineering, Doshisha University, Kyo-Tanabe-Shi, Kyoto 610-0321, Japan 2 Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, P. R. China 3 Department of Mechanical Engineering, Xiangtan University, Hunan 411105, P. R. China Received 24 December 2009; Accepted (in revised version) 5 March 2010 Available online 13 July 2010 Abstract. The problem of forced convection heat transfer of supercritical CO2 in a horizontal channel is investigated numerically by a lattice Boltzmann method. This study is stimulated by our recent experimental findings on solar collectors using su- percritical CO2 as a working fluid, which can achieve the collector efficiency high up to 70%. To deeply understand the heat transfer characteristics of supercritical CO2 and provide a theoretical guidance for improving our current experimental system, in present study several typical experimental flow conditions are simu- lated. In particular, the work focuses on the convective heat transfer characteristics of supercritical CO2 flowing in a horizontal channel with mediate Reynolds num- bers ranging from 210 to 840 and constant heat fluxes from 400.0 to 800.0 W/m2. The simulations show that the heat transfer increases with heat flux and decreases with Reynolds number. Furthermore, the mechanisms of heat transfer enhance- ment of supercritical CO2 fluid are identified. AMS subject classifications: 47.55.pb, 47.15.Rq, 47.10.A- Key words: Forced convection, supercritical CO2, lattice Boltzmann method. 1 Introduction Solar energy powered thermodynamic systems using supercritical CO2 as a working ∗Corresponding author. URL: http://kenkyudb.doshisha.ac.jp/rd/search/researcher/108197/index-j.html Email: xniu@mail.doshisha.ac.jp(X.-D.Niu),hyamaguc@mail.doshisha.ac.jp(H.Yamaguchi),etk1302@ mail4.doshisha.ac.jp (Y. Iwamoto), xrzhang@coe.pku.edu.cn (X.-R. Zhang), limingjun@xtu.edu.cn (M.-J. Li) http://www.global-sci.org/aamm 564 ⃝c 2010 Global Science Press

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