Convective Heat Transfer to CO₂ at a Supercritical Pressure Flowing Vertically Upward in Tubes and an Annulus Channel

Extensive experiments on heat transfer at a supercritical pressure to CO₂ in tubes and annular channels have been performed. The geometries of the test sections include tubes of an internal diameter of 4.4 and 9 mm and an annular channel (8 × 10 mm). Based on the test results a set of correlations, which covers a deteriorated heat transfer regime as well as a normal heat transfer regime, was developed.