Heat Transfer Due to an Axisymmetric Impinging Jet of Near-Critical-Point Carbon Dioxide

Abstract

The physical properties of a fluid vary drastically near its critical point. In this paper, heat transfer due to an axisymmetric laminar impinging jet onto a flat wall of uniform temperature is studied numerically, taking into account the pressure-and temperature dependence of all physical properties of supercritical carbon dioxide. Numerical solutions are obtained for the jet Reynolds numbers 500-2000, 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. When the jet temperature is very close to the pseudocritical point at a jet pressure of 7.5 MPa and lower, the distribution curve of the local Nusselt number has two or three peaks in the vicinity of the stagnation point, R<1; and the maximum heat flux does not occur at the stagnation point.