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570 X. D. Niu et al. / Adv. Appl. Math. Mech., 5 (2010), pp. 564-572 Figure 6: Distributions of specific heat inside the channel at Rein=210 and heat flux boundary conditions. Figure 7: Distributions of specific heat inside the channel at three Reynolds numbers and q=800[W/m]. vary drastically in the developing and boundary layer regions. Increasing heat flux has smaller effect on the distribution of the thermophysical properties than increasing Reynolds numbers. Reynolds number increase implies the inlet flow rate increases and as seen from Fig. 5, the thermal conductivity and kinematic viscosity are increased and the specific heat is decreased. Therefore, the inlet flow rate is significant on the performance of the heat transfer in the channel. The heat transfer performance of supercritical CO2 in the channel can be obtained by studying the local distributions of temperature, heat transfer rate and Nusselt num- bers. Fig. 8 shows the distributions of temperature, heat transfer coefficient and Nus- selt number along the channel at different Reynolds numbers and heat flux boundary conditions. Shown in Fig. 8, temperature along the channel centerline increases with both Reynolds number and heat flux. This is due to the high flow velocity giving faster heat convection than the low flow velocity and high heat flux meaning more heat input in a unit time. Observed from Figs. 8(b) and (c), the changing of Reynolds number has small ef-PDF Image | Study of Forced Convection Heat Transfer of Supercritical CO2 in a Horizontal Channel by Lattice Boltzmann Method
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