Heat transfer in supercritical fluids under pulse heating regime

The peculiarities of the heat transfer in supercritical fluids under short characteristic times scale has been studied experimentally. The constant heating power mode for the technique of controlled pulse heating of a wire probe was used for isobaric penetrating into the region of supercritical temperatures. The pressure range was (1-6)p/p(c) and the temperature range was (0.6-1.6)T-c, where subscript c corresponds to the critical point of a substance. The characteristic pulse length was 10 ms; the heat flux density through the probe surface was from 1 MW/m(2) to 10 MW/m(2). A sharp decrease in the heat transfer intensity for supercritical fluids with respect to that of subcritical liquids has been obtained. A high sensitivity of the heat transfer pattern to the reduced pressure values was revealed as well. (C) 2012 Elsevier Ltd. All rights reserved.