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X. D. Niu et al. / Adv. Appl. Math. Mech., 5 (2010), pp. 564-572 569 Figure 4: Velocity field of developing supercritical CO2 flow in the Channel at Rein=210 and q=400. boundary layer developed near the channel walls. Those observations are similar to the conventional fluid flows. The variations of the thermophysical properties in the channel are important for understanding of mechanisms for heat transport. Thermophysical properties from the numerical prediction of the convective flow using supercritical CO2 as working fluid were given using plots of steady-state condition. Fig. 5 presented distributions of thermal conductivity, specific heat and kinematic viscosity along the channel cen- terline at different Reynolds numbers and heat flux boundary conditions. To see the variation details of the thermo-physical properties inside the channel, we chose the specific heat as a representive and its distributions are displayed in Figs. 6 and 7 at constant Reynolds number and constant heat flux, respectively. It can be clearly seen from Figs. 5-7 that the variation of the thermophysical prop- erties of supercritical CO2 was complicated, which makes the heat transfer of super- critical CO2 very much different from conventional fluids. As shown in Figs. 5-7, the thermal conductivity, specific heat and viscosity changed not only along the chan- nel, but also in the cross plane. Generally speaking, the thermophysical properties Figure 5: Distributions of thermal conductivity, specific heat and kine- matic viscosity along the channel cen- terline at different Reynolds numbers and heat flux boundary conditions. (a) Thermal conductivity; (b) Specific heat; (c) Kinematic viscosity.PDF Image | Study of Forced Convection Heat Transfer of Supercritical CO2 in a Horizontal Channel by Lattice Boltzmann Method
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