泡沫填充方式对管内超临界CO₂流动换热的影响研究

The application of supercritical CO₂ in solar thermal power generation system could effectively improve the efficiency, compactness and environmental friendly of the system. Therefore, it is necessary to optimize the comprehensive performance of solar collectors using supercritical CO₂. In this paper, a new calculation model for the effective thermal conductivity of foam materials is proposed. The effects of different foam filling types on the flow and heat transfer performance and wall temperature distribution in receiver tubes are studied. The results show that the flow-heat transfer performance index (j/j_c)/(f/f_c)^1/3 is optimal for the annular filling method (filled along the inner wall of the tube), the net heat absorption is the largest, the highest wall temperature is the lowest and the temperature distribution is the same.