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572 X. D. Niu et al. / Adv. Appl. Math. Mech., 5 (2010), pp. 564-572 hanced. However, increasing Reynolds number decreases these two parameters. This is because Reynolds number increasing causes the temperature distribution more ho- mogenous and thus the temperature gradient near the wall decreases. These can be seen from Figs. 9 and 10. The temperature gradient near the wall increases with heat flux increasing and decreases with increase of the Reynolds number. 5 Conclusions The problem of low Reynolds number forced convection of supercritical CO2 in a horizontal channel is studied numerically by a lattice Boltzmann method. The re- sults show that the heat transfer increases with the heat flux and decreases with the Reynolds number in the present study. Furthermore, the mechanisms of heat transfer enhancement of supercritical CO2 are investigated. The temperature gradient near the wall increases with heat flux increasing and decreases with increase of the Reynolds number. References [1] X. R. ZHANG, H. YAMAGUCHI, K. FUJIMA, M. ENOMOTO AND N. SAWADA, A feasibility study of CO2-based Rankine cycle powered by solar energy, JSME. Int. J., Ser. B., 48 (2005), pp. 540–547. [2] H. YAMAGUCHI, X. R. ZHANG, K. FUJIMA, M. ENOMOTO AND N. SAWADA, A solar energy powered Rankine cycle using supercritical carbon dioxide, Appl. Therm. Eng., 26 (2006), pp. 2345–2354. [3] X. R. ZHANG, H. YAMAGUCHI, K. FUJIMA, M. ENOMOTO AND N. SAWADA, Study of solar energy powered transcritical cycle using supercritical carbon dioxide, Int. J. Energy. Res., 30 (2006), pp. 1117–1129. [4] X. R. ZHANG, H. YAMAGUCHI, K. FUJIMA, M. ENOMOTO AND N. SAWADA, Experimen- tal performance of solar powered system using carbon dioxide, AIP Conference Proceedings, 832 (2006), pp. 419–424. [5] X. R. ZHANG, H. YAMAGUCHI, K. FUJIMA, M. ENOMOTO AND N. SAWADA, Theoret- ical analysis of a thermodynamic cycle powered by solar energy for power and heat generation using supercritical carbon dioxide, The 18th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2005), Trondheim, Norway, pp. 1641–1648. [6] Z. GUO AND T. S. ZHAO, Lattice Boltzmann simulation of natural convection with temperature-dependent viscosity in a porous cavity, Prog. Comput. Fluid. Dyn., 5 (2005), pp. 110–117. [7] C. SHU, Y. T. CHEW AND X. D. NIU, Least-squares-based lattice Boltzmann method: a mesh- less approach for simulation of flows with complex geometry, Phys. Rew. E., 64 (2001), 045701. [8] D. A. WOLF-GLADROW, Lattice-Gas Cellula Automata and Lattice Boltzmann Models, Springer, Berlin, 2000. [9] PROPATH GROUP, PROPATH V12.1, 2001.PDF Image | Study of Forced Convection Heat Transfer of Supercritical CO2 in a Horizontal Channel by Lattice Boltzmann Method
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