A thermal transport analysis of fully developed flow of SC Ar through an isothermally heated duct and its comparison with SC CO 2 and water demonstrates that for similar rates of heat transfer, the increase in cost of using argon is small, in terms of flow work required, whereas the benefits are substantial with regard to complexity (due to P c being much lower), operational maintenance, and life of the thermal systems. Argon is easily-available, nonreactive, noncorrosive, and environmentally benign. This paper presents, for the first time, argon as an alternative SC fluid for thermal transport, whose P c is lower (47.994 atm) and it can work at low temperatures ( T c = -122.46☌). However, both of these fluids are reactive and corrosive, and require high pressures ( P c = 217.8 and 72.8 atm, respectively) SC water also needs high temperature ( T c = 373.95☌ for water). Motivated by many applications, extensive research has been devoted to thermal transport by SC water and CO 2. Indeed, the anomalous region starts within the subcritical liquid state and extends well into the SC region. This work highlights that the anomalous behavior, as observed above CP in the Widom region, extends to pressures and temperatures much below the critical pressure P c and/or critical temperature T c. It is now considered to have two distinct regions − "liquidlike" and "gas-like," with thermophysical properties exhibiting anomalous behavior near the critical point (CP). Supercritical (SC) fluid, which was discovered exactly two hundred years ago, was initially thought to have only one state with no distinction between the liquid and vapor.
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