ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-469-4
ISBN Online: 978-1-56700-470-0
Second Thermal and Fluids Engineering Conference
INVESTIGATION OF CORRELATION FOR FORCED CONVECTIVE HEAT TRANSFER TO SUPERCRITICAL CARBON DIOXIDE FLOWING IN A VERTICAL TUBE
Abstract
An experimental investigation of turbulent convective heat transfer to supercritical carbon dioxide flowing
upward and downward vertically was conducted in a heated bare tube with an inner diameter of 10mm. Among
the experimental conditions, the data show that the phenomenon of buoyancy and acceleration is obvious. For
the upward cases, as the buoyancy effect increasing the forced convective heat transfer to carbon dioxide will
transform to mixed convective heat transfer, then free convective heat transfer, in which the heat transfer
capacity is weakened firstly, then resumed and even strengthened. The acceleration often weakens the heat
transfer capacity both for upward and downward flow. A new heat transfer correlation for carbon dioxide at
supercritical pressures was developed. Assessment shows that 95.03% of the predicted Nusselt numbers agree
with the experimental data within ±30% error band.