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Study of Forced Convection Heat Transfer of Supercritical CO_(2) in a Horizontal Channel by Lattice Boltzmann Method

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 564-572页

作者： Xiaodong Niu Hiroshi Yamaguchi yuhiro iwamoto Xinrong Zhang Mingjun Li yuhiro iwamoto Department of Mechanical Engineering Doshisha UniversityKyo-Tanabe-ShiKyoto 610-0321Japan Department of Energy and Resources Engineering College of EngineeringPeking UniversityBeijing 100871P.R.China Department of Mechanical Engineering Xiangtan UniversityHunan 411105P.R.China

The problem of forced convection heat transfer of supercritical CO_(2) in a horizontal channel is investigated numerically by a lattice Boltzmann *** study is stimulated by our recent experimental findings on solar collectors using supercritical CO_(2) as a working fluid,which can achieve the collector efficiency high up to 70%.To deeply understand the heat transfer characteristics of supercritical CO_(2) and provide a theoretical guidance for improving our current experimental system,in present study several typical experimental flow conditions are *** particular,the work focuses on the convective heat transfer characteristics of supercritical CO_(2) flowing in a horizontal channel with mediate Reynolds numbers ranging from 210 to 840 and constant heat fluxes from 400.0 to 800.0 W/m^(2).The simulations show that the heat transfer increases with heat flux and decreases with Reynolds ***,the mechanisms of heat transfer enhancement of supercritical CO_(2) fluid are identified.

关键词： Forced convection supercritical CO_(2) lattice Boltzmann method

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Numerical Investigation of"Frog-Leap"Mechanisms of Three Particles Aligned Moving in an Inclined Channel Flow

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Advances in Applied Mathematics and Mechanics 2015年第2期7卷 207-228页

作者： Xiao-Dong Niu Ping Hu Xing-Wei Zhang Hui Meng Hiroshi Yamaguchi yuhiro iwamoto College of Eengineering Shantou UniversityShantou 515063China Energy Conversion Research Center Department of Mechanical EngineeringDoshisha UniversityKyoto 630-0321Japan

Intrigued by our recent experimental work(*** and ***-u,*** Eng.,133(2011),041302),the present study numerically investigate theﬂow-structure interactions(FSI)of three rigid circular particles aligned moving in an inclined channelﬂow at intermediate Reynolds numbers by using a momentum-exchanged immersed boundary-lattice Boltzmann method.A"frog-leap"phenomenon observed in the experiment is successfully captured by the present simulation and ﬂow characteristics and underlying FSI mechanisms of it are explored by examining the ef-fects of the channel inclined angles and Reynolds *** is found that the asym-metric difference of the vorticity distributions on the particle surface is the main cause of the"frog-leap"when particle moves in the boundary layer near the lower channel boundary.

关键词： Frog-leap ﬂuid-structure interactions inclined channelﬂow lattice Boltzmann method immersed boundary method

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