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 1p _c to 4–6p _c and from 0.6T _c to 1.6T _c , respectively (p _c and T _c 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.