In-tube cooling heat transfer of supercritical carbon dioxide. Part 2. Comparison of numerical calculation with different turbulence models

Effect of lubricating oil on cooling heat transfer of supercritical carbon dioxide

“…In this research, we particularly focus on the heat transfer characteristics of supercritical CO 2 at pressures from 8 to 12 MPa and temperatures from 20 to 70 C, which are the typical working conditions in a gas cooler. Since the thermodynamic and transport properties, i.e., the specific heat c p , thermal conductivity k, density r, and viscosity m, vary with the temperature and pressure, the heat transfer characteristics of supercritical CO 2 differ from those under constant-property flow and have attracted considerable research interest [1,2].…”

“Stagnation flow heat transfer of confined, impinging hot water jets under supercritical pressures”

“…Different studies on in-tube heat transfer to supercritical carbon dioxide were undertaken (e.g. [20][21][22]). For constant property fluid flow, it is known that the heat transfer is identical for heating and cooling conditions.…”

Development and validation of static simulation model for CO2 heat pump

“…Pitla Srinivas et al [5] proposed a heat transfer correlation by observing the heat transfer in the supercritical region of CO 2 using a tube-in-tube counter-flow heat exchanger, which had a stainless-steel inner tube with a diameter of 4.72 mm. Dang and Hihara [7,8] proposed a heat transfer correlation by experiments and investigated the effect of the mass flow rate, pressure, heat flux, and tube diameter on the supercritical region of CO 2 through experiments. They also reported the effect of lubricating oil on the supercritical region of supercritical CO 2 .…”