Numerical Investigation of Heat Transfer Characteristics of Supercritical Carbon Dioxide in Double D-Shape Channel

This paper presents the results of numerical investigation of the heat transfer characteristics of the supercritical carbon dioxide in double D-shape channel. The capability and thermal efficiency（ε） are affected obviously by the mass flow rate of the working fluid, which were studied closely here. The study shows that as the mass flow rate is slow down in the hot channel, the capability decreases and the thermal efficiency raises up. Heat transfer in the heat exchanger is driven by the temperature difference, so when the hot mass flow rate slowing down, the heat flux becomes weak and the wall temperature drops down. This phenomenon is different from the fixed heat flux heat transfer.