Heat transfer under supercritical parameters of pulse-heated liquid

A technique based on pulse heating of a wire probe (resistance thermometer) in a constant-heating power regime is developed and used for studies of comparative heat-transfer intensity in supercritical fluids (SCFs) in the pressure and temperature ranges from 1pc to 4–6pc and from 0.6Tc to 1.6Tc, respectively (pc and Tc are critical pressure and temperature). The characteristic parameters of the setup used are as follows: heating -pulse length, 1–10 ms; density of heat flux through the probe surface, 1–10 MW/m2; and repeatability of the selected power value in a series of pulses, not worse than 0.1%. A sharp decrease in the heat-transfer intensity in SCFs compared to that observed at subcritical temperatures is revealed.