Experimental Study of Heat Transfer to Supercritical Carbon Dioxide in a Horizontal Tube

The convection heat transfer characteristics and pressure drop of supercritical CO_2 in a horizontal tube were investigated experimentally.The results indicate that the inlet pressure,the mass flux density of CO_2 and the mass flux density of cooling water have important effects on the convection heat transfer characteristics while the inlet temperature and the buoyancy have nothing effects on it.The results also show that the inlet pressure and the mass flux density of CO_2 have important effects on the pressure drop.The experimental data in this study were compared with four correlations for convection heat transfer of supercritical CO_2,as a result,the Krasmochekov-Protopopov's correlation showed the best agreement to the experimental data.