HEAT-TRANSFER DUE TO AN AXISYMMETRICAL IMPINGING JET OF CARBON-DIOXIDE IN THE NEAR-CRITICAL REGION

The physical properties of a supercritical fluid vary drastically near its critical point. In this paper, heat transfer due to an axisymmetric laminar impinging jet onto a flat wall surface of uniform temperature is analyzed numerically, taking into account the pressure- and temperature-dependence of all physical properties of near-critical carbon dioxide for the jet Reynolds numbers 500-2 000, the jet pressure 7.4-8.4 MPa, and the temperature difference between the jet mouth and flat wall from 10 K to 150 K. The effects of the temperature and pressure of the jet, the jet-to-wall temperature difference, and the jet Reynolds number on the heat transfer characteristics are examined.